Core removing device for large-size composite material pipe production

Abstract

The utility model discloses a depoling device for large-size composite material pipe production, and belongs to the technical field of composite material pipe processing equipment. The technical problems that in the prior art, in the production process of ultra-large-diameter pipes, a traditional depoling device is complex in structure, insufficient in demolding force, unstable in demolding process, large in demolding difficulty, complex in operation and the like are solved. The demolding device comprises a supporting frame, a demolding component and a controller, the supporting frame comprises a front supporting frame and a rear demolding rack which are transversely arranged front and back, the rear demolding rack comprises a bottom connecting frame and rear demolding supporting frames arranged on the left side and the right side of the bottom connecting frame, and a demolding fixing frame used for abutting against the outer side wall of the demolding end of a pipe is installed on the front portion of the rear demolding rack; and the demolding part comprises a drag head part detachably connected with the core mold, a motor driving device and a hydraulic driving device.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material pipe processing equipment, in particular to a core stripping device for producing large-size composite material pipes. Background Art

[0002] With the rapid development of modern industrial technology, especially the growing demand for large pipelines in the fields of construction, chemical industry, energy, etc., in the production and processing technology of composite pipes, the plastic fiberglass pipe is made by winding carbon fiber around the outside of the core mold and then heating it into shape. The final prepared fiberglass pipe is tightly combined with the core mold, and it is difficult to remove the product, especially the core removal process of ultra-large diameter composite pipes is more difficult, which directly reduces the quality of the product and production efficiency.

[0003] In the production process of ultra-large diameter composite pipes, traditional core-removing devices often have problems such as insufficient demoulding force, unstable demoulding process, and complicated operation. Especially for large cylinders, pipes and other axisymmetric and square products with a diameter range of Φ500-2000mm and a length of 2000-15000mm, the demoulding is more difficult and the requirements for core-removing devices are more stringent.

[0004] Therefore, for the core-removing process of ultra-large diameter carbon fiber composite pipes, developing a large-scale core-removing device that can provide sufficient demoulding force and has simple and stable demoulding operation has become an urgent problem to be solved in the current pipe manufacturing field. Summary of the invention

[0005] In view of the shortcomings and deficiencies in the prior art, the utility model provides a demoulding component installed on a support frame, so that the entire device structure is simple, and combines motor drive and hydraulic drive to meet the demoulding force requirements, optimizes the demoulding process, makes the device easy to operate, and has strong stability in the demoulding process, improves the demoulding efficiency, reduces the product damage rate, and meets the production needs of ultra-large diameter pipes. Large-size composite material pipe production core stripping device for.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: including a support frame, a demoulding component, and a controller;

[0007] The support frame includes a front support frame and a rear demoulding frame arranged transversely in front and back, and the rear demoulding frame includes a bottom connecting frame and rear demoulding support frames arranged on the left and right sides thereof;

[0008] A demoulding fixing frame for butting against the outer side wall of the demoulding end of the pipe is installed at the front of the rear demoulding frame; the demoulding component includes a tractor head component detachably connected to the core mold, a motor drive device and a hydraulic drive device, and the tractor head component can be slidably connected to the rack at the top of the rear demoulding support frame;

[0009] The motor drive device comprises a reduction motor mounted on the tractor head component, and a gear meshing with a rack is provided at the bottom of the output shaft of the reduction motor;

[0010] The hydraulic drive device comprises a hydraulic cylinder installed at the front end of the rear demoulding frame, and the front end of the cylinder rod of the hydraulic cylinder can be abutted against the tractor head component.

[0011] Preferably, the tractor head component includes a tractor head platform portion slidably connected to the top racks of the two rear demolding support frames, a clamping portion and a demolding pull plate. The front end of the tractor head platform portion is provided with a clamping portion protruding outward, and the clamping portion is provided with an installation groove matching the core mold connecting portion. The demolding pull plate is installed in the installation groove for clamping and fixing the core mold connecting portion.

[0012] Preferably, a sealing plate is connected to the bottom of the installation groove, and vertical grooves arranged opposite to each other are provided on the left and right side surfaces of the installation groove of the clamping part; after the demoulding pull plate is detachably installed vertically inside the two vertical grooves, its bottom abuts against the top of the sealing plate;

[0013] The demoulding pull plate is a square plate with a U-shaped groove inside. The core mold connecting part is provided with a groove matching the U-shaped groove of the demoulding pull plate. After the groove of the core mold connecting part is clamped on the upper part of the U-shaped groove of the demoulding pull plate, they are installed together in the installation groove, and the demoulding pull plate is clamped into the vertical grooves on both sides.

[0014] Preferably, the front limit clamp of the demoulding fixed frame is connected with a demoulding module; a first through hole is provided in the middle of the demoulding module, and the size of the first through hole is larger than the outer diameter of the core mold and smaller than the outer diameter of the pipe;

[0015] The left and right sides of the demoulding module and the demoulding fixing frame are respectively connected with transversely arranged hydraulic cylinders, and the front ends of the cylinder rods of the hydraulic cylinders can abut against the front side wall of the tractor platform, but are not fixed thereto.

[0016] Preferably, two groups of vertical clamping limit members are provided on the demoulding fixing frames located on the left and right sides of the first through hole, and limit grooves are symmetrically provided on opposite sides of the clamping limit members, and the demoulding module can be detachably installed in the limit grooves.

[0017] Preferably, a mounting hole matching the cylindrical body of the hydraulic cylinder is provided on the demoulding fixing frame located outside the clamping limiter, and the cylindrical body of the hydraulic cylinder is fixedly connected to the demoulding fixing frame via a flange.

[0018] Preferably, a first slide rail matching the slide groove at the bottom of the tractor platform is provided on the top of the rear demoulding support frame, and a rack is provided on the rear demoulding support frame located on the inner side of the first slide rail; two reduction motors are installed in parallel on the tractor platform, and the bottom of the output shaft of the reduction motor is provided with a gear meshing with the corresponding side rack;

[0019] A displacement sensor connected to the controller signal is also installed at the bottom of the tractor platform.

[0020] Preferably, a second slide rail is provided on the bottom connecting frame, and a third slide rail matching the second slide rail is connected to the bottom of the front supporting frame;

[0021] The second slide rail and the third slide rail are respectively connected with a plurality of lifting brackets which can move along the slide rails.

[0022] Preferably, the lifting bracket includes a base and a lifting platform, and the lifting platform is controlled to rise and fall by a lifting device connected to the base;

[0023] The top surface of the first lifting platform of the lifting bracket located on the second slide rail matches the outer shape structure of the core mold, specifically a V-shaped structure with two sides tilted outwards, and two groups of rotatable support buffer rods are symmetrically arranged on the inclined surfaces on both sides of the first lifting platform;

[0024] The top surface of the second lifting platform of the lifting bracket, which is located on the third slide rail, is provided with an arc groove matching the outer shape structure of the pipe.

[0025] Preferably, an anti-skid buffer pad is provided inside the arc groove at the top of the second lifting platform, and the anti-skid buffer pad and the supporting buffer rod are made of polyurethane or polycarbonate plastic.

[0026] The utility model provides a core stripping device for the production of large-size composite pipes. It has the following beneficial effects:

[0027] The utility model of the core stripping device for large-size composite pipe production has a simple structure, easy installation and maintenance by designing the demoulding parts. At the same time, the coordinated work of the tractor head part, the motor drive device and the hydraulic drive device detachably connected to the core mold realizes the segmented control of the demoulding separation process, which not only meets the demoulding force requirements, but also optimizes the demoulding process, making the device operation simpler, improving the demoulding efficiency, and meeting the production requirements of ultra-large diameter pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the core stripping device for producing large-size composite pipes of the utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of a partial enlarged structure of a portion A where the demoulding component and the core mold connecting portion are connected to each other;

[0030] Figure 3 for Figure 1 A structural diagram of the main view;

[0031] Figure 4 for Figure 1A schematic diagram of the structure after the pipe fittings and the core mold are removed;

[0032] Figure 5 for Figure 4 A schematic diagram of the structure of the tractor head components;

[0033] Figure 6 for Figure 4 A schematic diagram of a top view of the structure;

[0034] Figure 7 for Figure 6 A schematic diagram of the structure in which the tractor head component is installed above the demoulding frame;

[0035] Figure 8 for Figure 4 A schematic diagram of the structure of the lifting bracket on the second slide rail;

[0036] Fig. 9 for Figure 4 Schematic diagram of the structure of the lifting bracket on the third slide rail.

[0037] In the figure: 1. tractor head component; 101. tractor head platform; 102. clamping part; 103. demoulding pull plate; 2. demoulding fixing frame; 201. demoulding module; 202. clamping limiter; 3. core mold; 301. core mold connecting part; 4. lifting bracket; 401. first lifting platform; 4011. supporting buffer rod; 402. second lifting platform; 5. rack; 6. first slide rail; 7. rear demoulding frame; 8. second slide rail; 9. third slide rail; 10. hydraulic cylinder; 11. pipe. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] See also Figure 1-Figure 9 As shown, a technical solution provided by the utility model:

[0041] like Figure 1-Figure 5As shown, the core stripping device for large-size composite pipe production of the utility model includes a support frame, a demoulding component, and a controller. The support frame includes a front support frame and a rear demoulding frame 7 arranged horizontally in front and behind, and the rear demoulding frame 7 includes a bottom connecting frame and a rear demoulding support frame arranged on its left and right sides. A demoulding fixing frame 2 for abutting against the outer wall of the demoulding end of the pipe 11 is installed at the front of the rear demoulding frame 7. The demoulding component includes a tractor head component 1 detachably connected to the core mold 3, a motor drive device and a hydraulic drive device, and the tractor head component 1 can be slidably connected to the rack 5 at the top of the rear demoulding support frame. The motor drive device includes a reduction motor installed on the tractor head component 1, and a gear meshing with the rack 5 is provided at the bottom of the output shaft of the reduction motor. The hydraulic drive device includes a hydraulic cylinder 10 installed at the front end of the rear demoulding frame 7, and the front end of the cylinder rod of the hydraulic cylinder 10 can abut against the tractor head component 1.

[0042] This structural design, through the design of demoulding parts, makes the entire core-removing device simple in structure, easy to install and maintain. At the same time, the coordinated work of the tractor head part, the motor drive device and the hydraulic drive device detachably connected to the core mold 3 realizes the segmented control of the demoulding separation process, which not only meets the demoulding force requirements, but also optimizes the demoulding process, making the device operation simpler, improving the demoulding efficiency, and the entire core-removing process is both stable and efficient.

[0043] like Figure 2 and Figure 5 As shown, the tractor head component 1 includes a tractor head platform portion 101, a clamping portion 102 and a demoulding pull plate 103 which are slidably connected to the top racks 5 of the two rear demoulding support frames. The front end of the tractor head platform portion 101 is provided with a clamping portion 102 protruding outward, and the clamping portion 102 is provided with a mounting groove matching the core mold connecting portion 301. The demoulding pull plate 103 is installed in the mounting groove for clamping and fixing the core mold connecting portion 301. The bottom of the installation groove is connected with a sealing plate, and vertical grooves are arranged opposite to each other on the left and right sides of the installation groove of the clamping part 102; the demoulding plate 103 is detachably installed vertically inside the two vertical grooves, and its bottom abuts against the top of the sealing plate; the demoulding plate 103 is a square plate body with a U-shaped groove inside, and the core mold connecting part 301 is provided with a groove matching the U-shaped groove of the demoulding plate 103. After the groove of the core mold connecting part 301 is clamped on the upper part of the U-shaped groove of the demoulding plate 103, they are installed in the installation groove together, and the demoulding plate 103 is clamped into the vertical grooves on both sides. This structure further defines the specific structure of the tractor head component 1, and realizes the stable connection of the core mold 3. The structure of the tractor head component 1 is cleverly designed. The demoulding plate 103 is installed on the mounting groove of the clamping part 102 and the two are used in conjunction with each other. At the same time, the U-shaped groove structure arranged on the demoulding plate 103 can firmly connect the core mold 3 and apply the pulling force on the tractor head component 1 to the axial direction of the core mold 3, ensuring that the demoulding process is stable and smooth.

[0044] like Figure 3-Figure 4 As shown, the front side limit clamp of the demoulding fixed frame 2 is connected with a demoulding module 201; a first through hole is provided in the middle of the demoulding module 201, and the size of the first through hole is larger than the outer diameter of the core mold 3 and smaller than the outer diameter of the pipe 11. The left and right sides of the demoulding module 201 and the demoulding fixed frame 2 are respectively connected with a horizontally arranged hydraulic cylinder 10, and the front end of the cylinder rod of the hydraulic cylinder 10 can abut against the front side wall of the tractor platform part 101, but is not fixed thereto. Two groups of vertical clamping limit members 202 are provided on the demoulding fixed frame 2 located on the left and right sides of the first through hole, and the limit grooves are symmetrically provided on the opposite side of the clamping limit members 202, and the demoulding module 201 can be detachably installed in the limit grooves. In this structural design, the hydraulic cylinder 10 and the tractor platform part 101 are used in conjunction with each other, and the piston rod of the hydraulic cylinder 10 can be abutted against the front side wall of the platform part to realize hydraulically driven demoulding.

[0045] like Figure 6-Figure 7 As shown, the top of the rear demoulding support frame is provided with a first slide rail 6 matching the bottom slide groove of the tractor platform 101, and a rack 5 is provided on the rear demoulding support frame located on the inner side of the first slide rail 6; two reduction motors are installed in parallel on the tractor platform 101, and the bottom of the output shaft of the reduction motor is provided with a gear meshing with the corresponding side rack 5; a displacement sensor connected to the controller signal is also installed at the bottom of the tractor platform 101. The displacement sensor senses the position and state of the tractor platform 101, and the coordinated use of the reduction motor and the rack 5 realizes the automatic movement of the tractor platform 101. At the same time, the reduction motor can accurately control the moving speed and position of the tractor platform 101 through the gear on its output shaft meshing with the rack 5, and realizes hydraulic driven demoulding.

[0046] like Figure 4 As shown, a second slide rail 8 is provided on the bottom connecting frame, and a third slide rail 9 matching the second slide rail 8 is connected to the bottom of the front support frame; the second slide rail 8 and the third slide rail 9 are respectively connected with a plurality of lifting brackets 4 that can move along the slide rails. The lifting bracket 4 includes a base and a lifting platform, and the lifting platform is controlled by a lifting device connected to the base. In this structural design, the lifting bracket 4 is used to carry and adjust the position of the pipe 11 so that its axis is aligned with the center of the first circular hole of the stripping module 201.

[0047] like Figure 6-Figure 9As shown, the top surface of the first lifting platform 401 located on the second slide rail 8 and the lifting bracket 4 matches the outer shape structure of the core mold 3, specifically a V-shaped structure with both sides tilted outward. This design enables the first lifting platform 401 to adapt to core molds 3 of different sizes and shapes, improves the flexibility and application range of the equipment; increases the support area of ​​the bracket and improves stability. Two groups of rotatable support buffer rods 4011 are also symmetrically arranged on the inclined surfaces on both sides of the first lifting platform 401. The support buffer rods 4011 can not only roll with the movement of the core mold 3 during the demolding process, but also provide support and buffering effects, reduce direct contact and friction between the core mold 3 and the bracket, thereby protecting the surface of the core mold 3 from damage. The top surface of the second lifting platform 402 located on the third slide rail 9 and the lifting bracket 4 is provided with an arc groove that matches the outer shape structure of the pipe 11 to ensure the stability and positioning accuracy of the pipe 10 during the demolding process.

[0048] An anti-skid buffer pad is provided inside the arc groove at the top of the second lifting platform 402. The anti-skid buffer pad and the supporting buffer rod 4011 are made of polyurethane or polycarbonate plastic. The material has strong wear resistance and impact resistance, further ensuring the stable demoulding work.

[0049] How it works

[0050] The working mode of demoulding separation is as follows:

[0051] First, since the core mold 3 and the tube 10 are tightly connected, the required demoulding force is also very large. Once the core mold 3 and the tube 10 have relative movement, the required demoulding force will drop sharply. In view of this feature, the demoulding separation working mode is divided into motor-driven demoulding, hydraulic demoulding, and simultaneous demoulding. The demoulding forces are 17%, 83%, and 100% respectively.

[0052] The stripping module 201 is mounted on the stripping fixing frame 2, and the un-stripped pipe 11 is placed on the second lifting platform 402 of the lifting bracket 4 on the third slide rail 9, and the outer end of the un-stripped pipe 11 is abutted against the outer side wall of the stripping module 201, and the lifting height of the second lifting platform 402 is adjusted so that its axis is aligned with the center of the stripping module 201. After the core mold connecting part 301 passes through the first through hole of the stripping module 201, it extends to one side of the clamping part 102 of the tractor head component 1.

[0053] The core mold connecting part 301 is installed in the installation groove on the clamping part of the tractor head component 1. After installation, the core mold connecting part 301 will be clamped on the U-shaped groove of the demoulding pull plate 103 to ensure that the core mold 3 can be firmly connected to the tractor head component 1.

[0054] Secondly, the reduction motor above the tractor head component 1 drives the tractor head component 1 to slide on the first slide rail 6 through the meshing of the gear and the rack 5, thereby driving the core mold 3 to slowly move to the rear of the support frame to achieve motor-driven demoulding. At this time, the motor-driven demoulding force is 17%. Then, the cylinder rod of the hydraulic cylinder 10 slowly extends and connects to the front side walls on both sides of the tractor head platform 101, providing the necessary thrust for demoulding and achieving hydraulic demoulding. At this time, the demoulding force is 83%. At the same time, the motor-driven demoulding and hydraulic-driven demoulding work together to achieve a demoulding force of 100%. When the core mold 3 moves to the appropriate position, the cylinder rod of the hydraulic cylinder 10 retracts and immediately separates from the tractor platform part 101 of the tractor component 1, the hydraulic cylinder 10 stops working, and the motor drives the tractor component 1 to continue to move to the rear of the support frame. At the same time, the first lifting platform 401 will rise, and its V-shaped support platform will support the bottom of the core mold 3. The supporting buffer rod 4011 under the bottom of the core mold 3 rolls as the core mold 3 moves backward until the core mold 3 is completely separated from the pipe 10.

[0055] During the entire demoulding and separation process, the controller will accurately control the movements of each component to ensure the smooth progress of the demoulding process.

[0056] In summary, the utility model is a core demolding device for the production of large-size composite material pipes. The coordinated work of the tractor head component detachably connected to the core mold, the motor drive device and the hydraulic drive device realizes the segmented control of the demolding separation process, which not only meets the demolding force requirements, but also optimizes the demolding process, making the device operation simpler, improving the demolding efficiency, and meeting the production needs of ultra-large diameter pipes.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme of the present invention and the concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A core stripping device for large-size composite pipe production, characterized in that: It includes a support frame, a demoulding component, and a controller; The support frame comprises a front support frame and a rear demoulding frame (7) arranged transversely in the front and rear directions, and the rear demoulding frame (7) comprises a bottom connecting frame and rear demoulding support frames arranged on the left and right sides thereof; A demoulding fixing frame (2) is installed at the front of the rear demoulding frame (7) for abutting against the outer side wall of the demoulding end of the pipe material (11); the demoulding component comprises a tractor component (1) detachably connected to the core mold (3), a motor drive device and a hydraulic drive device, and the tractor component (1) is slidably connected to the rack (5) at the top of the rear demoulding support frame; The motor drive device comprises a reduction motor mounted on the tractor head component (1), and a gear meshing with the rack (5) is provided at the bottom of the output shaft of the reduction motor; The hydraulic drive device comprises a hydraulic cylinder (10) mounted on the front end of the rear demoulding frame (7), and the front end of the cylinder rod of the hydraulic cylinder (10) can abut against the tractor head component (1).

2. A core stripping device for producing large-size composite pipes according to claim 1, characterized in that: The tractor head component (1) comprises a tractor head platform portion (101) slidably connected to the top racks (5) of the two rear demoulding support frames, a clamping portion (102) and a demoulding pull plate (103); the front end of the tractor head platform portion (101) is provided with the clamping portion (102) protruding outwards; the clamping portion (102) is provided with a mounting groove matching the core mold connecting portion (301); the demoulding pull plate (103) is installed in the mounting groove for clamping and fixing the core mold connecting portion (301).

3. A core stripping device for producing large-size composite pipes according to claim 2, characterized in that: The bottom of the installation groove is connected to a sealing plate, and vertical grooves arranged opposite to each other are provided on the left and right side surfaces of the installation groove of the clamping portion (102); the demoulding pull plate (103) is detachably installed vertically inside the two vertical grooves, and its bottom abuts against the top of the sealing plate; The demoulding pull plate (103) is a square plate body with a U-shaped groove inside. The core mold connecting part (301) is provided with a groove matching the U-shaped groove of the demoulding pull plate (103). After the groove of the core mold connecting part (301) is clamped on the upper part of the U-shaped groove of the demoulding pull plate (103), they are installed together in the installation groove, and the demoulding pull plate (103) is clamped into the vertical grooves on both sides.

4. A core stripping device for producing large-size composite pipes according to claim 2, characterized in that: The demoulding module (201) is connected to the front limit clamp of the demoulding fixing frame (2); a first through hole is provided in the middle of the demoulding module (201); the size of the first through hole is larger than the outer diameter of the core mold (3) and smaller than the outer diameter of the tube (11); The demoulding fixing frame (2) is respectively connected to the left and right sides of the demoulding module (201) with the hydraulic cylinder (10) arranged transversely, and the front end of the cylinder rod of the hydraulic cylinder (10) can abut against the front side wall of the tractor platform (101), but is not fixed thereto.

5. A core stripping device for producing large-size composite pipes according to claim 4, characterized in that: Two groups of vertical clamping limit members (202) are provided on the demoulding fixing frame (2) located on the left and right sides of the first through hole, and limit grooves are symmetrically provided on opposite sides of the clamping limit members (202), and the demoulding module (201) can be detachably installed in the limit grooves.

6. A core stripping device for producing large-size composite pipes according to claim 5, characterized in that: A mounting hole matching the cylindrical cylinder body of the hydraulic cylinder (10) is provided on the demoulding fixing frame (2) and is located outside the clamping limiter (202). The cylindrical cylinder body of the hydraulic cylinder (10) is fixedly connected to the demoulding fixing frame (2) via a flange.

7. A core stripping device for producing large-size composite pipes according to claim 2, characterized in that: A first slide rail (6) matching the slide groove at the bottom of the tractor platform (101) is provided on the top of the rear demoulding support frame, and the rack (5) is provided on the rear demoulding support frame located on the inner side of the first slide rail (6); two reduction motors are installed in parallel on the tractor platform (101), and the bottom of the output shaft of each reduction motor is provided with a gear meshing with the rack (5) on the corresponding side; A displacement sensor connected to the controller signal is also installed at the bottom of the tractor platform part (101).

8. The core stripping device for producing large-size composite pipes according to claim 2, characterized in that: A second slide rail (8) is provided on the bottom connecting frame, and a third slide rail (9) matching the second slide rail (8) is connected to the bottom of the front supporting frame; The second slide rail (8) and the third slide rail (9) are respectively connected to a plurality of lifting brackets (4) which can move along the slide rails.

9. A core stripping device for producing large-size composite pipes according to claim 8, characterized in that: The lifting bracket (4) comprises a base and a lifting platform, and the lifting platform is controlled to move up and down by a lifting device connected to the base; The top surface of the first lifting platform (401) of the lifting bracket (4) located on the second slide rail (8) matches the outer structure of the core mold (3), specifically a V-shaped structure with two sides inclined outwards, and two groups of rotatable support buffer rods (4011) are symmetrically arranged at intervals on the inclined surfaces on both sides of the first lifting platform (401); The top surface of the second lifting platform (402) of the lifting bracket (4) located on the third slide rail (9) is provided with an arc-shaped groove matching the outer structure of the pipe (11).

10. A core stripping device for producing large-size composite pipes according to claim 9, characterized in that: An anti-skid buffer pad is provided inside the arc-surface groove on the top of the second lifting platform (402), and the anti-skid buffer pad and the supporting buffer rod (4011) are both made of polyurethane or polycarbonate plastic.

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