Adjustable preheating device for injection molding of steel belt pipe joint

Abstract

The utility model relates to an adjustable steel belt pipe joint injection molding preheating device which comprises a support, a cylindrical barrel and a plurality of heating assemblies located in an inner cavity of the barrel, the support is connected with the barrel, the heating assemblies are circumferentially arranged at equal intervals with the axis of the barrel as the circle center, and each heating assembly comprises an adjusting part and a heating part. The adjusting part is used for adjusting the distance between the heating part and the side wall of the inner cavity of the barrel, one end of the adjusting part is fixedly connected with the barrel, and the other end is fixedly connected with the heating part. According to the heating device in the scheme, the position of the heating part in the cylinder can be adjusted through the adjusting part, so that the device can be suitable for preheating of more steel belt pipes with different sizes. When the device is used for preheating a steel belt pipe with a smaller pipe diameter, the heating part can be controlled to be close to the outer surface of the steel belt pipe through the adjusting part, so that excessive heat is prevented from being lost outwards along a gap between the steel belt pipe and the heating part, and the steel belt pipe with the smaller pipe diameter can have a good preheating effect.

Description

Technical Field

[0001] The utility model relates to the technical field of preheating of steel belt pipes, and more specifically, to an adjustable preheating device for injection molding of steel belt pipe joints. Background Art

[0002] At present, PE steel belt pipes on the market are mainly heat-shrinkable belt pipes and narrow electrofusion belt pipes. The installation processes of heat-shrinkable belt pipes and narrow electrofusion belt pipes are complex. During installation, professional technicians are required to use professional auxiliary equipment for installation, and the installation accessory costs are relatively high. In addition, heat-shrinkable belt pipes and narrow electrofusion belt pipes also have requirements for the installation space and weather environment during installation. Not only sufficient construction space is needed, but also construction in rainy or snowy weather should be avoided to prevent the belt pipes from getting wet with water and affecting the butt joint sealing quality. Compared with heat-shrinkable belt pipes and narrow electrofusion belt pipes with demanding installation conditions, the tools used for socket-type steel belt pipes during installation are simple to operate. During construction, there is no need to separately dig and reserve a construction position, and there is no need for steps such as heat shrinkage and electrofusion. The installation is not restricted by the weather.

[0003] The welding strength between the injection molded joints at both ends of the upper pipe body of the socket-type steel belt pipe and the pipe directly affects the quality of the steel belt pipe. In order to improve the welding strength between the steel belt pipe and the injection molded joint, generally, before injection molding of the socket, the joint of the steel belt pipe is preheated to make it soften appropriately, and then injection molding of the socket of the steel belt pipe joint is carried out. In the prior art, generally, a heating box is used to preheat the steel belt pipe. A steel sleeve is arranged inside the heating box, and heating blocks are installed on the steel sleeve. During heating, the heating blocks heat the wall of the steel sleeve, and then the heat is radiated to the steel belt pipe through the wall of the sleeve to make it soften by heat. However, the general applicability of this preheating method for steel belt pipes is not high. When preheating a steel belt pipe with a smaller diameter, the distance between the side wall of the steel belt pipe and the side wall of the steel sleeve becomes larger, and a part of the heat will be lost along the gap between the side wall of the steel belt pipe and the side wall of the steel sleeve. This not only affects the preheating effect of the steel belt pipe, but also the lost heat will cause waste of energy. Summary of the Utility Model

[0004] In order to overcome the problem in the above prior art that when the heating block preheats a steel belt pipe with a smaller diameter through a steel sleeve, heat will be lost along the gap between the side wall of the steel belt pipe and the side wall of the steel sleeve, the utility model provides an adjustable preheating device for injection molding of steel belt pipe joints. This solution can flexibly adjust the position of the heating pipe so that the heating part can be close to steel belt pipes of different sizes, avoiding excessive heat loss caused by too large a distance between the heating part and the steel belt pipe.

[0005] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: It includes a bracket, a cylindrical barrel body, and a plurality of heating components located in the inner cavity of the barrel body. The bracket is connected to the barrel body, and the plurality of heating components are arranged at equal intervals in a circle with the axis of the barrel body as the center. Each heating component includes an adjustment part and a heating part. The adjustment part is used to adjust the distance between the heating part and the inner side wall of the barrel body. One end of the adjustment part is fixedly connected to the barrel body, and the other end is fixedly connected to the heating part.

[0006] In this solution, the heating device can adjust the position of the heating part in the barrel body through the adjustment part, enabling the device to be applicable to the preheating of more different-sized steel strip pipes. When the device preheats a steel strip pipe with a smaller diameter, the distance between the heating part and the inner side wall of the barrel body can be increased through the adjustment part, making the heating part closer to the outer surface of the steel strip pipe, avoiding excessive heat loss outward through the gap between the steel strip pipe and the heating part, enabling the steel strip pipe with a smaller diameter to have a good preheating effect, and also avoiding excessive heat loss resulting in energy waste.

[0007] Preferably, the adjustment part includes a screw mounting seat, a bidirectional screw, a first crank, a second crank, and a fixed seat. The screw mounting seat is fixedly connected to the barrel body, and the fixed seat is fixedly connected to the heating part. The adjustment part is fixedly connected to the heating part through the fixed seat and fixedly connected to the barrel body through the screw mounting seat. The bidirectional screw is rotatably connected to the screw mounting seat. A positive rotation nut is threadedly connected to the positive thread section of the bidirectional screw. A first mounting plate is provided on the positive rotation nut. One end of the first crank is rotatably connected to the first mounting plate, and the other end is rotatably connected to the fixed seat. A reverse rotation nut is threadedly connected to the reverse thread end of the bidirectional screw. A second mounting plate is provided on the reverse rotation nut. One end of the second crank is rotatably connected to the second mounting plate, and the other end is rotatably connected to the fixed seat. When it is necessary to adjust the distance between the heating part and the inner side wall of the barrel body through the adjustment part to adapt to a steel strip pipe with a smaller diameter, the bidirectional screw on the screw mounting seat is controlled to rotate. The rotation of the bidirectional screw drives the positive rotation nut and the reverse rotation nut thereon to move towards the middle position of the bidirectional screw, and the two approach each other. As the positive rotation nut and the reverse rotation nut move towards the middle of the bidirectional screw, the angles between the first crank and the second crank and the bidirectional screw become larger. At this time, the distance between the bidirectional screw and the fixed seat becomes larger, and the heating part moves towards the axis direction of the barrel body in the barrel, approaching the steel strip pipe with a smaller diameter. When the device preheats a steel strip pipe with a larger diameter, the bidirectional screw rotates in the reverse direction, the positive rotation nut and the reverse rotation nut move away from each other, the angles between the first crank and the second crank and the bidirectional screw become smaller, and the distance between the bidirectional screw and the fixed seat becomes smaller, enabling the steel strip pipe with a larger diameter to enter the device for preheating.

[0008] Preferably, the screw mounting seat includes a first bearing seat and a second bearing seat. Both the first bearing seat and the second bearing seat are fixedly connected to the cylinder body. The two ends of the bidirectional screw are respectively fixedly connected to the inner rings of the first bearing seat and the second bearing seat. The bidirectional screw rod is fixed on the cylinder body through the first bearing seat and the second bearing seat. The bearing seat can reduce the friction generated by the rotation of the bidirectional screw and extend the service life of the device. The two bearing seats respectively fix the two ends of the bidirectional screw, further increasing the fixing strength of the bidirectional screw in the cylinder body.

[0009] Preferably, when the first crank and the second crank are rotatably connected to the fixed seat, they are respectively located on both sides of the end face of the fixed seat. The first crank and the second crank are respectively located on both sides of the end face of the fixed seat, which can respectively limit the positions of both sides of the fixed seat, making the fixed seat always parallel to the bidirectional screw and preventing the fixed seat from shifting or deflecting during the rotation of the crank.

[0010] Preferably, the first crank includes a first bent section and a second bent section. The first bent section and the second bent section form an obtuse angle. The first bent section is rotatably connected to the first mounting plate, and the second bent section is rotatably connected to one side of the fixed seat close to the second bearing seat. The second crank includes a third bent section and a fourth bent section. The third bent section and the fourth bent section form an obtuse angle. The third bent section is rotatably connected to the second mounting plate, and the fourth bent section is rotatably connected to one side of the fixed seat close to the first bearing seat. By providing two bent sections on the crank, the two cranks are in a crossed state. At this time, the first crank and the second crank are staggered from each other, which can set a longer crank, making the movement range of the fixed seat and the heating part larger, and the device can preheat steel strip pipes of more sizes.

[0011] Preferably, outer mounting plates are further provided at both ends of the cylinder body. The outer mounting plates are annular for the steel strip pipe to pass through. The first bearing seat and the second bearing seat are respectively fixedly connected to the two outer mounting plates at both ends of the cylinder body. Since the inner cavity side wall of the cylinder body is cylindrical, the first bearing seat and the second bearing seat are fixed on the cylinder body through the outer mounting plates, which can avoid the inconvenience of fixing on the circular inner side wall when directly fixed on the inner side wall of the cylinder body.

[0012] Preferably, the heating part includes a heating pipe and a lamp cover. Fixing parts are fixedly connected to both ends of the heating pipe. The fixing parts are fixedly connected to the lamp cover. The lamp cover is fixedly connected to the fixed seat. The fixed seat and the heating pipe are respectively located on opposite sides of the lamp cover. The heating pipe is installed on the fixed seat through the lamp cover. The lamp cover can reflect the heat radiation emitted by the heating pipe to the pipe fittings, making the preheating effect of the pipe fittings better, and can also prevent the heat radiation of the heating pipe from heating the fixed seat and affecting the service life of the fixed seat.

[0013] Preferably, it further includes a driving part, which is fixedly connected to the inner side wall of the cylinder body. The driving end of the driving part is connected to the bidirectional screw to drive the bidirectional screw to rotate. There are several driving parts, and each bidirectional screw is connected to one driving part. The driving part can be a rotary motor. The several driving parts respectively control the bidirectional screws in the several adjusting parts. When the steel belt pipe is severely deformed, each adjusting part can be controlled separately, so that the severely deformed steel belt pipe can also be preheated, softened and its shape can be trimmed.

[0014] Preferably, it further includes a driving part and a transmission belt. One end of the bidirectional screw is fixedly connected with a transmission wheel. The transmission belt bypasses several transmission wheels in sequence. The driving end of the driving part is connected to the transmission belt to drive the transmission belt to move. The driving part can be a rotary motor. The driving part can be connected to one bidirectional screw to drive the transmission belt to move, or can directly contact the transmission belt to drive the transmission belt to move. Using one driving part to drive the bidirectional screws in all adjusting parts for simultaneous control can reduce the setting of the driving part and lower the cost of the device.

[0015] Preferably, it further includes a mounting frame, which is fixedly connected to the outer side wall of the cylinder body. The bracket is slidably connected to the mounting frame. The mounting frame is also provided with a locking part to prevent the mounting frame from sliding on the bracket. The cylinder body is connected to the bracket through the mounting frame. The cylinder body is slidably connected to the bracket through the mounting frame, so that the cylinder body can slide up and down on the bracket, facilitating the adjustment of the position of the cylinder body, and making the device applicable to more preheating situations of steel belt pipes.

[0016] Compared with the prior art, the beneficial effect of the present utility model is that: in this solution, the heating device can adjust the position of the heating part in the cylinder body through the adjusting part, so that the device can be applicable to the preheating of more steel belt pipes with different sizes. When the device preheats a steel belt pipe with a smaller diameter, the distance between the heating part and the inner side wall of the cylinder body can be increased through the adjusting part, so that the heating part is close to the outer surface of the steel belt pipe, avoiding excessive heat loss along the gap between the steel belt pipe and the heating part, enabling the steel belt pipe with a smaller diameter to have a good preheating effect, and also avoiding excessive heat loss causing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an adjustable preheating device for an injection molded joint of a steel belt pipe of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the adjusting part and the heating part of an adjustable preheating device for an injection molded joint of a steel belt pipe of the present utility model;

[0019] Figure 3 is a schematic working state diagram of an adjustable preheating device for an injection molded joint of a steel belt pipe of the present utility model;

[0020] Figure 4 It is a schematic diagram of the working state when the adjustable steel belt pipe joint injection preheating device of the present utility model preheats a steel belt pipe with a smaller pipe diameter;

[0021] Figure 5 It is a schematic diagram of the working state of the adjusting part and the heating part when the adjustable steel belt pipe joint injection preheating device of the present utility model preheats a steel belt pipe with a smaller pipe diameter;

[0022] Figure 6 It is a schematic diagram of the working state when the adjustable steel belt pipe joint injection preheating device of the present utility model preheats a steel belt pipe with a larger pipe diameter;

[0023] Figure 7 It is a schematic diagram of the working state of the adjusting part and the heating part when the adjustable steel belt pipe joint injection preheating device of the present utility model preheats a steel belt pipe with a larger pipe diameter. Specific embodiments

[0024] The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent; for better illustration of this embodiment, some components in the accompanying drawings are omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The positional relationships described in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0025] In the accompanying drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings, 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. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] The technical solutions of the present utility model will be further specifically described below through specific embodiments and in conjunction with the accompanying drawings:

[0027] Embodiment 1

[0028] As Figures 1-7Shown is an embodiment of an adjustable preheating device for injection molding of a steel belt pipe joint, which includes a bracket 1, a cylindrical barrel 2, and a plurality of heating components located in the inner cavity of the barrel 2. The bracket 1 is connected to the barrel 2, and the plurality of heating components are arranged at equal intervals in a circle with the axis of the barrel 2 as the center. Each heating component includes an adjusting part and a heating part. The adjusting part is used to adjust the distance between the heating part and the inner side wall of the barrel 2. One end of the adjusting part is fixedly connected to the barrel 2, and the other end is fixedly connected to the heating part.

[0029] Specifically, the adjusting part includes a screw mounting seat, a bidirectional screw 3, a first crank 4, a second crank 5, and a fixed seat 6. The screw mounting seat is fixedly connected to the barrel 2, and the fixed seat 6 is fixedly connected to the heating part. The adjusting part is fixedly connected to the heating part through the fixed seat 6 and is fixedly connected to the barrel 2 through the screw mounting seat. The bidirectional screw 3 is rotatably connected to the screw mounting seat. A positive rotation nut 7 is threadedly connected to the positive thread section of the bidirectional screw 3. A first mounting plate 9 is provided on the positive rotation nut 7. One end of the first crank 4 is rotatably connected to the first mounting plate 9, and the other end is rotatably connected to the fixed seat 6. A reverse rotation nut 8 is threadedly connected to the reverse thread end of the bidirectional screw 3. A second mounting plate 10 is provided on the reverse rotation nut 8. One end of the second crank 5 is rotatably connected to the second mounting plate 10, and the other end is rotatably connected to the fixed seat 6.

[0030] The working principle or process of this device: When it is necessary to adjust the distance between the heating part and the inner side wall of the barrel 2 through the adjusting part to adapt to a steel belt pipe with a smaller diameter, the bidirectional screw 3 on the screw mounting seat is controlled to rotate. The rotation of the bidirectional screw 3 drives the positive rotation nut 7 and the reverse rotation nut 8 thereon to move towards the middle position of the bidirectional screw 3, and the two approach each other. As the positive rotation nut 7 and the reverse rotation nut 8 move towards the middle of the bidirectional screw 3, the included angles between the first crank 4 and the second crank 5 and the bidirectional screw 3 become larger. At this time, the distance between the bidirectional screw 3 and the fixed seat 6 becomes larger, and the heating part moves towards the axis direction of the barrel 2 inside the barrel 2, approaching the steel belt pipe with a smaller diameter. When the device preheats a steel belt pipe with a larger diameter, the bidirectional screw 3 rotates in the reverse direction, the positive rotation nut 7 and the reverse rotation nut 8 move away from each other, the included angles between the first crank 4 and the second crank 5 and the bidirectional screw 3 become smaller, and the distance between the bidirectional screw 3 and the fixed seat 6 becomes smaller, enabling the steel belt pipe with a larger diameter to enter the device for preheating.

[0031] The beneficial effects of this embodiment: In this solution, the heating device can adjust the position of the heating part inside the barrel 2 through the adjusting part, enabling the device to be applicable to the preheating of more steel belt pipes with different sizes. When the device preheats a steel belt pipe with a smaller diameter, the distance between the heating part and the inner side wall of the barrel 2 can be increased through the adjusting part, making the heating part close to the outer surface of the steel belt pipe, avoiding excessive heat loss along the gap between the steel belt pipe and the heating part, enabling the steel belt pipe with a smaller diameter to have a good preheating effect, and also avoiding excessive heat loss resulting in energy waste.

[0032] Example 2

[0033] Example 2 of an injection preheating device for an adjustable steel belt pipe joint, based on Example 1, as Figures 1-7 shown, further defines the structure of the device.

[0034] Specifically, the screw mounting seat includes a first bearing seat 11 and a second bearing seat 12. Both the first bearing seat 11 and the second bearing seat 12 are fixedly connected to the cylinder body 2. The two ends of the bidirectional screw 3 are respectively fixedly connected to the inner rings of the first bearing seat 11 and the second bearing seat 12.

[0035] Specifically, when the first crank 4 and the second crank 5 are rotatably connected to the fixed seat 6, they are respectively located on both sides of the end face of the fixed seat 6. The first crank 4 includes a first bent section 401 and a second bent section 402. The first bent section 401 and the second bent section 402 form an obtuse angle. The first bent section 401 is rotatably connected to the first mounting plate 9, and the second bent section 402 is rotatably connected to one side of the fixed seat 6 close to the second bearing seat 12; the second crank 5 includes a third bent section 501 and a fourth bent section 502. The third bent section 501 and the fourth bent section 502 form an obtuse angle. The third bent section 501 is rotatably connected to the second mounting plate 10, and the fourth bent section 502 is rotatably connected to one side of the fixed seat 6 close to the first bearing seat 11.

[0036] Specifically, outer mounting plates 13 are also provided at both ends of the cylinder body 2. The outer mounting plates 13 are annular for the steel belt pipe to pass through. The first bearing seat 11 and the second bearing seat 12 are respectively fixedly connected to the two outer mounting plates 13 at both ends of the cylinder body 2.

[0037] Specifically, the heating part includes a heating tube 14 and a lamp shade 15. Fixing parts 16 are fixedly connected to both ends of the heating tube 14. The fixing parts 16 are fixedly connected to the lamp shade 15. The lamp shade 15 is fixedly connected to the fixed seat 6. The fixed seat 6 and the heating tube 14 are respectively located on opposite sides of the lamp shade 15.

[0038] Specifically, it further includes a driving part and a transmission belt. One end of the bidirectional screw 3 is fixedly connected with a transmission wheel. The transmission belt sequentially bypasses several transmission wheels. The driving end of the driving part is connected to the transmission belt to drive the transmission belt to move. The driving part can be a rotating motor. The driving part can be connected to one bidirectional screw 3 to drive the transmission belt to move, or can also be in direct contact with the transmission belt to drive the transmission belt to move.

[0039] Specifically, it further includes a mounting frame. The mounting frame is fixedly connected to the outer side wall of the cylinder body 2. The support 1 is slidably connected to the mounting frame. A locking part is also provided on the mounting frame to prevent the mounting frame from sliding on the support 1. The cylinder body 2 is connected to the support 1 through the mounting frame.

[0040] Advantages of this embodiment: The bidirectional threaded rod is fixed to the cylinder body 2 through the first bearing seat 11 and the second bearing seat 12. The bearing seats can reduce the friction generated by the rotation of the bidirectional screw rod 3 and extend the service life of the device. The two bearing seats respectively fix the two ends of the bidirectional screw rod 3, further increasing the fixing strength of the bidirectional screw rod 3 in the cylinder body 2.

[0041] The first crank 4 and the second crank 5 are respectively located on both sides of the end face of the fixed seat 6, and can respectively limit the positions of both sides of the fixed seat 6, so that the fixed seat 6 is always parallel to the bidirectional screw rod 3, avoiding the deviation or deflection of the fixed seat 6 during the rotation of the crank. Two bending sections are provided on the crank, so that the two cranks are in a crossed state. At this time, the first crank 4 and the second crank 5 are staggered from each other, and longer cranks can be set, so that the movement ranges of the fixed seat 6 and the heating part are larger, and the device can preheat steel strip pipes of more sizes.

[0042] The first bearing seat 11 and the second bearing seat 12 are fixed to the cylinder body 2 through the outer mounting plate 13, which can avoid the inconvenience of fixing on the circular inner side wall when directly fixed to the inner side wall of the cylinder body 2. The heating tube 14 is installed on the fixed seat 6 through the lamp cover 15. The lamp cover 15 can reflect the heat radiation emitted by the heating tube 14 to the pipe fitting, making the preheating effect of the pipe fitting better, and can also avoid the heat radiation of the heating tube 14 from heating the fixed seat 6 and affecting the service life of the fixed seat. Using one driving part to drive and control all the bidirectional screw rods 3 in all the adjusting parts at the same time can reduce the setting of the driving part and lower the cost of the device. The cylinder body 2 is slidably connected to the bracket 1 through the mounting frame, so that the cylinder body 2 can slide up and down on the bracket 1, facilitating the adjustment of the position of the cylinder body 2, and making the device suitable for more preheating situations of steel strip pipes.

[0043] Embodiment 3

[0044] An embodiment of an adjustable preheating device for steel strip pipe joints. The difference between this embodiment and Embodiment 2 is that there is no transmission belt, and there are several driving parts, and each bidirectional screw rod 3 is connected to one driving part.

[0045] Advantages of this embodiment: Several driving parts respectively control the bidirectional screw rods 3 in several adjusting parts. When the steel strip pipe is severely deformed, each adjusting part can be controlled separately, so that the severely deformed steel strip pipe can also be preheated, softened and shaped.

[0046] Other features, working principles and advantages of this embodiment are the same as those of Embodiment 2.

[0047] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An adjustable preheating device for injection molding of steel strip pipe joints, characterized in that It includes a bracket (1), a cylindrical barrel (2), and a number of heating components located inside the barrel (2). The bracket (1) is connected to the barrel (2), and the number of heating components are arranged at equal intervals in a circle with the axis of the barrel (2) as the center. The heating component includes an adjustment part and a heating part. The adjustment part is used to adjust the distance between the heating part and the inner cavity side wall of the barrel (2). One end of the adjustment part is fixedly connected to the barrel (2), and the other end is fixedly connected to the heating part.

2. The injection preheating device for an adjustable steel belt pipe joint according to claim 1, characterized in that, The adjustment part includes a screw mounting seat, a bidirectional screw (3), a first crank (4), a second crank (5), and a fixed seat (6). The screw mounting seat is fixedly connected to the barrel (2), the fixed seat (6) is fixedly connected to the heating part, and the bidirectional screw (3) is rotatably connected to the screw mounting seat. A positive rotation nut (7) is threadedly connected to the positive thread section of the bidirectional screw (3). A first mounting plate (9) is provided on the positive rotation nut (7). One end of the first crank (4) is rotatably connected to the first mounting plate (9), and the other end is rotatably connected to the fixed seat (6); A reverse rotation nut (8) is threadedly connected to the reverse thread end of the bidirectional screw (3). A second mounting plate (10) is provided on the reverse rotation nut (8). One end of the second crank (5) is rotatably connected to the second mounting plate (10), and the other end is rotatably connected to the fixed seat (6).

3. An injection preheating device for an adjustable steel belt pipe joint according to claim 2, characterized in that, The screw mounting seat includes a first bearing seat (11) and a second bearing seat (12). Both the first bearing seat (11) and the second bearing seat (12) are fixedly connected to the barrel (2). The two ends of the bidirectional screw (3) are respectively fixedly connected to the inner rings of the first bearing seat (11) and the second bearing seat (12).

4. An adjustable preheating device for injection molding of a steel belt pipe joint according to claim 3, characterized in that, When the first crank (4) and the second crank (5) are rotatably connected to the fixed seat (6), they are respectively located on both sides of the end face of the fixed seat (6).

5. An adjustable preheating device for injection molding of a steel belt pipe joint according to claim 4, characterized in that, The first crank (4) includes a first bent section (401) and a second bent section (402). The first bent section (401) and the second bent section (402) form an obtuse angle. The first bent section (401) is rotatably connected to the first mounting plate (9), and the second bent section (402) is rotatably connected to the side of the fixed seat (6) close to the second bearing seat (12). The second crank (5) includes a third bent section (501) and a fourth bent section (502). The third bent section (501) and the fourth bent section (502) form an obtuse angle. The third bent section (501) is rotatably connected to the second mounting plate (10), and the fourth bent section (502) is rotatably connected to the side of the fixed seat (6) close to the first bearing seat (11).

6. An adjustable preheating device for injection molding of a steel belt pipe joint according to claim 3, characterized in that, Outer mounting plates (13) are also provided at both ends of the barrel (2). The outer mounting plates (13) are annular for a steel belt pipe to pass through. The first bearing seat (11) and the second bearing seat (12) are respectively fixedly connected to the two outer mounting plates (13) at both ends of the barrel (2).

7. An injection preheating device for an adjustable steel strip pipe joint according to claim 2, characterized in that, The heating part includes a heating tube (14) and a lamp shade (15). Both ends of the heating tube (14) are fixedly connected with fixing parts (16). The fixing parts (16) are fixedly connected with the lamp shade (15). The lamp shade (15) is fixedly connected with the fixing seat (6). The fixing seat (6) and the heating tube (14) are respectively located on opposite sides of the lamp shade (15).

8. An adjustable preheating device for injection molding of steel belt pipe joints according to claim 2, characterized in that, It further includes a driving part. The driving part is fixedly connected with the inner side wall of the cylinder body (2). The driving end of the driving part is connected with the bidirectional screw (3) to drive the bidirectional screw (3) to rotate. There are several driving parts, and each bidirectional screw (3) has one driving part connected thereto.

9. An injection preheating device for an adjustable steel belt pipe joint according to claim 2, characterized in that, It further includes a driving part and a transmission belt. One end of the bidirectional screw (3) is fixedly connected with a transmission wheel. The transmission belt sequentially bypasses several transmission wheels. The driving end of the driving part is connected with the transmission belt to drive the transmission belt to move.

10. An adjustable preheating device for injection molding of a steel strip pipe joint according to any one of claims 1-9, characterized in that, It further includes a mounting bracket. The mounting bracket is fixedly connected with the outer side wall of the cylinder body (2). The bracket (1) is slidably connected with the mounting bracket. The mounting bracket is further provided with a locking part to prevent the mounting bracket from sliding on the bracket (1). The cylinder body (2) is connected with the bracket (1) through the mounting bracket.

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