Internal expansion equipment for compounding stainless steel composite pipe

Abstract

The internal expansion equipment comprises a machine body, a pipe clamping mechanism and a pipe expanding mechanism are arranged on the top face of the machine body, the length direction of the machine body is a first direction, and the pipe expanding mechanism is in sliding connection with the machine body in the first direction; the pipe expanding mechanism comprises a push rod distributed in the first direction and a plurality of pipe expanding sleeves arranged on the push rod in a sleeving mode, the outer diameters of the pipe expanding sleeves are sequentially increased in the direction from the front end to the tail end of the push rod, and the push rod is provided with an insertion hole used for insertion of a plug pin. The pipe clamping mechanism is used for clamping and fixing a pipe, the pipe expanding sleeve is pushed into the inner pipe through the push rod, the inner pipe is expanded from the inside through the pipe expanding sleeve, and therefore the inner pipe and the outer pipe are compounded and fixed to complete production of the stainless steel composite pipe. And the pipe expanding sleeves with different outer diameters can be fixed with the push rod through the bolts, so that the production of stainless steel composite pipes with different pipe diameters is realized, and the practicability of the equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe expanding machines, and particularly relates to an internal expansion device for compounding stainless steel composite pipes. Background Art

[0002] A stainless steel composite pipe is a pipe made of two or more different metal materials through a special process. Its structure usually includes an inner carbon steel pipe and an outer stainless steel pipe. This composite structure enables the stainless steel composite pipe to achieve complementary advantages in the metal properties of the inner and outer layers.

[0003] Existing stainless steel composite pipes can use a pipe expanding machine to expand the inner pipe, so that the inner pipe and the outer pipe are fixedly compounded to realize processing and production. However, when the existing pipe expanding machine is in use, the size of the mandrel for expanding the inner pipe is fixed. In order to produce stainless steel composite pipes of different sizes, multiple mandrels need to be prepared, which increases the production cost; moreover, the size and weight of the mandrel are relatively large, resulting in many inconveniences in the disassembly and replacement of the mandrel, and reducing the convenience of using the pipe expanding machine.

[0004] Therefore, it is necessary to improve the pipe expanding machine in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the defects existing in the prior art, and provide an internal expansion device for compounding stainless steel composite pipes, which is applicable to processing stainless steel composite pipes with different pipe diameters and improves the convenience of using the device.

[0006] To achieve the above purpose, the specific technical solution of the internal expansion device for compounding stainless steel composite pipes of the utility model is as follows:

[0007] An internal expansion device for compounding stainless steel composite pipes includes a machine body. A pipe clamping mechanism and a pipe expanding mechanism are arranged on the top surface of the machine body. Along the length direction of the machine body is the first direction, and the pipe expanding mechanism is slidably connected to the machine body along the first direction; the pipe expanding mechanism includes a push rod distributed along the first direction and a plurality of pipe expanding sleeves sleeved on the push rod. The outer diameter of each pipe expanding sleeve gradually increases from the front end to the end of the push rod, and a plug hole for inserting a plug pin is formed on the push rod.

[0008] Preferably, the front end of the pipe expanding sleeve has a conical expansion section.

[0009] Preferably, among two adjacent pipe expanding sleeves, the outer diameter of the end of the previous pipe expanding sleeve is greater than the outer diameter of the front end of the next pipe expanding sleeve.

[0010] Preferably, a plurality of plug holes are formed, and each plug hole is equally spaced along the axial direction of the push rod.

[0011] Preferably, a moving seat is slidably arranged on the top surface of the machine body along a first direction, the end of the push rod is fixedly connected to the moving seat, and the machine body is provided with a power unit in transmission connection with the moving seat.

[0012] Preferably, the pipe clamping mechanism includes two clamping jaws slidably arranged relative to each other along a direction perpendicular to the first direction, and the two clamping jaws are symmetrically arranged with respect to the axis line of the push rod.

[0013] Preferably, the machine body is provided with a fixed seat, the fixed seat is fixedly connected with a hydraulic cylinder arranged along a direction perpendicular to the first direction, the movable end of the hydraulic cylinder is fixedly connected to the clamping jaw, the clamping jaw is fixedly connected with a guide post, and the fixed seat is provided with a guide sleeve slidably matched with the guide post.

[0014] Preferably, a support seat is slidably arranged on the top surface of the machine body along the first direction, the support seat is powered by a driving unit, and the pipe clamping mechanism is arranged between the support seat and the pipe expanding mechanism.

[0015] The internal expansion device for stainless steel composite pipes of the present utility model has the following advantages: the pipe clamping mechanism is used to clamp and fix the pipe, the push rod pushes the pipe expanding sleeve into the inner pipe, and the inner pipe is expanded from the inside through the pipe expanding sleeve, so that the inner pipe and the outer pipe are fixedly combined to complete the production of stainless steel composite pipes; different pipe expanding sleeves with different outer diameters can be fixed to the push rod through pins, so as to realize the production of stainless steel composite pipes with different pipe diameters and improve the practicability of the device; each pipe expanding sleeve is sleeved on the push rod, and when adjusting, only need to slide the pipe expanding sleeve along the push rod, without disassembling the pipe expanding sleeve, which greatly improves the convenience of using the device. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the internal expansion device of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the pipe expanding mechanism of the present utility model;

[0018] Figure 3 is an exploded structural diagram of the pipe expanding mechanism of the present utility model;

[0019] Figure 4 is a schematic installation structural diagram of the pipe expanding parts of the present utility model;

[0020] Figure 5 is a schematic structural diagram of the pipe expanding parts of the present utility model;

[0021] Description of marks in the figure: 1. Machine body; 2. Pipe clamping mechanism; 3. Support base; 4. Moving seat; 5. Pipe expanding mechanism; 6. Power unit; 201. Fixed seat; 202. Hydraulic cylinder; 203. Guide post; 204. Claw; 205. Guide sleeve; 501. Push rod; 502. Pipe expanding sleeve; 503. Plug pin; 504. Plug hole; 505. Expansion section. Detailed implementation manners

[0022] The following combines the accompanying drawings and embodiments to further describe the detailed implementation manners of the present utility model. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0023] "Top surface", "bottom", and "bottom surface" are referenced based on the normal use state of the internal expansion device for stainless steel composite pipe cladding, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0024] As Figures 1-5 As shown, an internal expansion device for stainless steel composite pipe cladding includes a machine body 1. A pipe clamping mechanism 2 and a pipe expanding mechanism 5 are arranged on the top surface of the machine body 1. Along the length direction of the machine body 1 is the first direction, and the pipe expanding mechanism 5 is slidably connected to the machine body 1 along the first direction; the pipe expanding mechanism 5 includes a push rod 501 distributed along the first direction and a plurality of pipe expanding sleeves 502 sleeved on the push rod 501. The outer diameter of each pipe expanding sleeve 502 increases sequentially from the front end to the end of the push rod 501, and a plug hole 504 for inserting a plug pin 503 is provided on the push rod 501.

[0025] The above internal expansion device is a pipe expanding machine, which is applicable to the cladding operation of the inner pipe and the outer pipe of the stainless steel composite pipe. When the pipe expanding machine is in use, the stainless steel composite pipe after pipe threading is fixed on the machine body 1 through the pipe clamping mechanism 2, and the push rod 501 pushes the pipe expanding sleeve 502 into the inner pipe, and the inner pipe is expanded from the inside through the pipe expanding sleeve 502, so that the inner pipe and the outer pipe are clad and fixed to form a stainless steel composite pipe.

[0026] The plug pin 503 is arranged behind the expanding sleeves 502 with different outer diameters, enabling the adapting of the expanding sleeves 502 to stainless steel composite pipes of different sizes. During the forward movement of the push rod 501, the expanding sleeve 502 located in front of the advancing direction of the push rod 501 is pushed forward by the push rod 501 under the limiting action of the plug pin 503, and the inner pipe of the stainless steel composite pipe is expanded by one of the expanding sleeves 502 with the maximum outer diameter. The expanding sleeve 502 located behind the plug pin 503 will move along the push rod 501 towards its end under the pushing action of the stainless steel composite pipe because there is no limiting effect of the plug pin 503 and cannot enter the interior of the stainless steel composite pipe. Thus, the pipe expanding machine can be applicable to the production of stainless steel composite pipes of different sizes, enhancing the practicality of the equipment. Each expanding sleeve 502 is sleeved on the push rod 501 and is in sliding fit with the push rod 501. When selecting the appropriate expanding sleeve 502, it is only necessary to push the expanding sleeve 502 to slide along the push rod 501. Compared with replacing the entire mandrel in the prior art, the convenience of using the pipe expanding machine is greatly improved.

[0027] After the pipe expanding is completed, the expanding sleeve 502 penetrates through the stainless steel composite pipe and extends out from the other end. At this time, it is necessary to retract the push rod 501 to facilitate the removal of the stainless steel composite pipe. During this process, the expanding sleeve 502 can be removed from the front end of the push rod 501, which can reduce the resistance received when the push rod 501 retracts. After the push rod 501 withdraws from the interior of the stainless steel composite pipe, the removed expanding sleeve 502 is successively sleeved on the push rod 501, further enhancing the convenience of using the pipe expanding machine.

[0028] A further improvement is that, as Figure 5 shown, the front end of the expanding sleeve 502 has a conical expansion section 505. The conical expansion section 505 can play a guiding role when the expanding sleeve 502 enters the stainless steel composite pipe, improving the smoothness of the movement of the expanding sleeve 502 and reducing the damage to the stainless steel composite pipe at the same time.

[0029] A further improvement is that, as Figure 4 shown, among two adjacent expanding sleeves 502, the outer diameter of the end of the previous expanding sleeve 502 is larger than the outer diameter of the front end of the subsequent expanding sleeve 502. The setting of the expanding sleeves 502 in the above-mentioned pipe expanding machine can reduce the resistance received when each expanding sleeve 502 enters the stainless steel composite pipe and reduce the damage to the stainless steel composite pipe at the same time.

[0030] A further improvement is that, as Figure 2 and 3 shown, a plurality of plug holes 504 are provided, and the plug holes 504 are equally spaced along the axial direction of the push rod 501. The setting of the plurality of plug holes 504 enables the plug pin 503 to be inserted into the plug holes 504 at different positions, facilitating the adjustment of the position of the plug pin 503, and thus facilitating the selection of the expanding sleeve 502 suitable for the stainless steel composite pipe.

[0031] A further improvement is that, as Figure 1 shown, a moving seat 4 is slidably arranged on the top surface of the machine body 1 along the first direction. The end of the push rod 501 is fixedly connected to the moving seat 4, and the machine body 1 is provided with a power unit 6 which is in transmission connection with the moving seat 4. The power unit 6 includes a motor and a lead screw. The lead screw is in threaded cooperation with the moving seat 4, so as to provide power through the motor and drive the moving seat 4 to move through the lead screw, and finally drive the push rod 501 to move along the first direction.

[0032] A further improvement is that, as Figure 1 shown, the pipe clamping mechanism 2 includes two clamping jaws 204 which are slidably arranged relative to each other along a direction perpendicular to the first direction, and the two clamping jaws 204 are symmetrically arranged about the axis line of the push rod 501. The cross-sectional shape of the clamping jaw 204 is arc-shaped, which can better adapt to the structure of the stainless steel composite pipe. The outer pipe of the stainless steel composite pipe is clamped by the two clamping jaws 204 from both sides to realize the fixation of the stainless steel composite pipe.

[0033] A further improvement is that, as Figure 1 shown, the machine body 1 is provided with a fixed seat 201. The fixed seat 201 is fixedly connected with a hydraulic cylinder 202 arranged along a direction perpendicular to the first direction. The movable end of the hydraulic cylinder 202 is fixedly connected to the clamping jaw 204. The clamping jaw 204 is fixedly connected with a guide post 203, and the fixed seat 201 is provided with a guide sleeve 205 which is in sliding cooperation with the guide post 203. The guide post 203 and the guide sleeve 205 cooperate with each other to play a role in guiding and supporting the clamping jaw 204, improving the stability of the clamping jaw 204. The hydraulic cylinder 202 drives the clamping jaw 204 to move, realizing the mutual approach and mutual separation movement of the two clamping jaws 204, and finally realizing the clamping and relaxation of the clamping jaw 204; the two clamping jaws 204 are respectively driven by a hydraulic cylinder 202 to move, so that the two clamping jaws 204 can also be controlled to move in the same direction, thereby realizing the adjustment of the position of the stainless steel composite pipe, so as to facilitate the adjustment of the coaxiality between the push rod 501 and the stainless steel composite pipe.

[0034] A further improvement is that, as Figure 1 shown, a support seat 3 is slidably arranged on the top surface of the machine body 1 along the first direction. The support seat 3 is powered by a driving unit. The pipe clamping mechanism 2 is arranged between the support seat 3 and the pipe expanding mechanism 5. The arrangement of the support seat 3 can support the end of the stainless steel composite pipe, preventing the inner pipe from moving along with the pipe expanding sleeve 502 when the pipe expanding sleeve 502 passes through the stainless steel composite pipe, thereby causing the separation between the inner pipe and the outer pipe; the driving unit includes a motor and a lead screw. The lead screw is in threaded cooperation with the support seat 3. Through the cooperation of the motor and the lead screw, the support seat 3 can be driven to move along the first direction. When the pipe expanding sleeve 502 moves to the end of the stainless steel composite pipe, the support seat 3 is moved to separate it from the stainless steel composite pipe, so that the end of the stainless steel composite pipe is opened, facilitating the pipe expanding sleeve 502 to pass through from the other end of the stainless steel composite pipe.

[0035] It can be understood that the present utility model is described by means of some embodiments. Those skilled in the art will know that without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. An internal expansion device for stainless steel composite pipe composite, comprising a machine body (1), characterized in that: A pipe clamping mechanism (2) and a pipe expanding mechanism (5) are arranged on the top surface of the machine body (1). Along the length direction of the machine body (1) is the first direction, and the pipe expanding mechanism (5) is slidably connected to the machine body (1) along the first direction; The pipe expanding mechanism (5) includes a push rod (501) distributed along the first direction and a plurality of pipe expanding sleeves (502) sleeved on the push rod (501). The outer diameter of each pipe expanding sleeve (502) increases successively from the front end to the end of the push rod (501). Plug holes (504) for inserting pins (503) are formed in the push rod (501).

2. The internal expansion device for composite stainless steel pipes according to claim 1, characterized in that, The front end of the pipe expanding sleeve (502) has a conical expansion section (505).

3. The internal expansion device for stainless steel composite pipe composite according to claim 2, characterized in that, Among two adjacent pipe expanding sleeves (502), the outer diameter of the end of the previous pipe expanding sleeve (502) is larger than the outer diameter of the front end of the next pipe expanding sleeve (502).

4. The internal expansion device for stainless steel composite pipe composite according to claim 3, characterized in that, A plurality of the plug holes (504) are formed, and each of the plug holes (504) is equally spaced along the axial direction of the push rod (501).

5. The internal expansion device for composite stainless steel pipes according to claim 1, characterized in that, A moving seat (4) is slidably arranged on the top surface of the machine body (1) along the first direction. The end of the push rod (501) is fixedly connected to the moving seat (4), and the machine body (1) is provided with a power unit (6) in transmission connection with the moving seat (4).

6. The internal expansion device for stainless steel composite pipe composite according to claim 1, characterized in that, The pipe clamping mechanism (2) includes two clamping jaws (204) slidably arranged relatively along a direction perpendicular to the first direction, and the two clamping jaws (204) are symmetrically arranged about the axis of the push rod (501).

7. The inner expansion device for stainless steel composite pipe composite according to claim 6, characterized in that, The machine body (1) is provided with a fixed seat (201), the fixed seat (201) is fixedly connected with a hydraulic cylinder (202) arranged along a direction perpendicular to the first direction, the movable end of the hydraulic cylinder (202) is fixedly connected to the clamping jaw (204), the clamping jaw (204) is fixedly connected with a guide post (203), and the fixed seat (201) is provided with a guide sleeve (205) in sliding fit with the guide post (203).

8. The internal expansion device for stainless steel composite pipe composite according to claim 1, characterized in that, A support seat (3) is slidably arranged on the top surface of the machine body (1) along the first direction, the support seat (3) is powered by a driving unit, and the pipe clamping mechanism (2) is arranged between the support seat (3) and the pipe expanding mechanism (5).

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