Molding equipment for stainless steel-lined composite pipe fitting

Abstract

The utility model discloses forming equipment for a stainless steel lined composite pipe fitting. The forming equipment comprises a guide bracket, an advancing seat, a rotating seat and a rolling unit, the advancing seat is slidably mounted on the guide support, the outer edge of the advancing seat is circular, the rotating seat is of an annular structure and rotatably mounted on the periphery of the advancing seat, and the rolling units are distributed on the periphery of the rotating seat in an annular array. The rolling unit comprises an assembling support, a roller and an electric telescopic cylinder, the assembling support is rotationally installed on the outer edge of the rotating base, the roller is rotationally installed at the outer end of the assembling support, and the two ends of the electric telescopic cylinder are hinged to the assembling support and the rotating base respectively. The equipment further comprises a driving motor and a transmission assembly, the driving motor is in power connection with the transmission assembly, and the transmission assembly is in power connection with the advancing base and the rotating base. By optimizing the power transmission layout, the stability of parts is improved, the machining efficiency is improved, the structure is simplified, and the problems of existing lining stainless steel composite pipe fitting forming equipment are remarkably solved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite pipe production, in particular to a forming device for composite pipe fittings lined with stainless steel. Background Art

[0002] In existing lined stainless steel composite pipe forming equipment, the composite pipe is mainly formed by rolling by applying pressure to the inside. However, these equipment face a series of technical challenges in practical applications, especially in the reasonable layout of the power transmission mechanism and the stable operation of the working parts.

[0003] The power transmission mechanism of existing molding equipment is usually difficult to reasonably layout, resulting in the following problems:

[0004] Limited space: Due to the small inner diameter of the composite pipe, the power transmission mechanism needs to perform complex movements and transmissions in a limited space, making the layout difficult.

[0005] Transmission efficiency: unreasonable layout may lead to energy loss during power transmission and reduce transmission efficiency.

[0006] Complex structure: In order to achieve multiple functions, the transmission mechanism of existing equipment is often designed to be too complicated, which increases the difficulty of manufacturing and maintenance.

[0007] During the composite pipe forming process, the working parts need to move and operate stably inside the pipe. However, due to the design deficiencies of existing equipment, the working parts are easily disturbed by various factors when moving inside the pipe, resulting in unstable movement trajectory and affecting the forming quality.

[0008] Traditional molding equipment also has shortcomings in processing efficiency and effect. Due to the unreasonable design of transmission mechanism and working parts, the molding process often takes a long time, affecting production efficiency. Due to the instability of movement and positioning, the molding effect is often not uniform and consistent, resulting in unstable product quality. Utility Model Content

[0009] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the utility model is to provide a forming equipment for lined stainless steel composite pipe fittings, which significantly improves many problems of the existing lined stainless steel composite pipe fittings forming equipment in practical applications by optimizing the layout of the power transmission mechanism, improving the stability of the working parts, improving the processing efficiency and effect, and simplifying the equipment structure.

[0010] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a forming device for lined stainless steel composite pipe fittings, including a guide bracket, a traveling seat, a rotating seat, and a rolling unit. The guide bracket is arranged in the horizontal direction, the traveling seat is slidably installed on the guide bracket and runs along the length direction of the guide bracket, the outer edge of the traveling seat is a circular structure, the rotating seat is an annular structure and is rotatably installed on the periphery of the traveling seat, and the rolling unit includes a plurality of groups distributed in an annular array on the periphery of the rotating seat.

[0011] The rolling unit comprises an assembly bracket, a roller, and an electric telescopic cylinder. The assembly bracket is rotatably mounted on the outer edge of the rotating seat, the roller is rotatably mounted on the outer end of the assembly bracket, and the two ends of the electric telescopic cylinder are respectively hinged with the assembly bracket and the rotating seat.

[0012] It also includes a driving motor and a transmission assembly. The driving motor is in power connection with the transmission assembly. The transmission assembly is mounted on the guide bracket and is in power connection with the traveling seat and the rotating seat.

[0013] In some of the implementations, in order to ensure that the guide bracket can be stably installed in the horizontal direction and that the traveling seat can slide stably on the guide bracket, the following technical solutions are provided.

[0014] It also includes an assembly seat, the bottom of which is fixedly connected to a horizontally arranged supporting base, the guide bracket includes a transverse guide plate and a longitudinal guide plate that is vertically distributed with the transverse guide plate, the longitudinal guide plate is fixedly connected to the center line position of the transverse guide plate, the traveling seat is provided with a T-shaped guide groove that is slidably connected with the transverse guide plate and the longitudinal guide plate, the same end of the transverse guide plate and the longitudinal guide plate is fixedly connected to a vertically arranged assembly pad, the assembly pad is kept in contact with the front side wall of the assembly seat, and the rear side wall of the assembly seat is fitted with a mounting pad, and the assembly pad, the assembly seat and the mounting pad are fixedly connected by a bolt assembly.

[0015] In some of the implementations, in order to ensure that the transmission assembly can be stably assembled on the guide bracket, ensure that the drive motor is stably installed and realizes power connection with the transmission assembly, the following technical solutions are provided.

[0016] Two groups of mounting seats arranged opposite to each other are fixedly connected to the transverse guide plate. A mounting cavity is provided in the mounting seat. The mounting cavity is arranged between the assembly pad and the mounting pad. The drive motor is fixedly installed in the mounting cavity.

[0017] The transmission assembly includes a horizontally arranged spline shaft and an adjusting screw, which are rotatably mounted on two sets of mounting seats, and a synchronous wheel is fixedly connected to the same end of the spline shaft and the adjusting screw. The two sets of synchronous wheels are dynamically connected via a synchronous belt, and the adjusting screw or the spline shaft maintains a synchronous connection with the output shaft of the driving motor.

[0018] In some of the implementations, in order to ensure that the transmission assembly can drive the traveling seat and the rotating seat to operate stably, the following technical solutions are provided.

[0019] The adjusting screw passes through the traveling seat and is rotationally connected to the traveling seat. An annular assembly groove is provided on the outer edge of the traveling seat. A circular assembly groove connected to the annular assembly groove is also provided on the traveling seat. An inner gear ring arranged in the annular assembly groove is fixedly connected to the inner wall of the rotating seat. A transmission gear meshing with the inner gear ring is rotatably installed in the circular assembly groove. The spline shaft passes through the axial center of the transmission gear and is slidably connected to the transmission gear.

[0020] In some of the implementations, in order to ensure that the rolling units can be stably assembled on the periphery of the rotating seat, that the rotating seat can drive the rolling units to operate stably, and that the rolling units can adjust their retracted and extended postures, the following technical solutions are provided.

[0021] An annular mounting groove is provided on the periphery of the rotating seat, and the assembly bracket is arranged in a herringbone structure. The three end points of the herringbone structure are respectively rotationally connected with the annular mounting groove, the roller, and the movable end of the electric telescopic cylinder. A mounting shaft is also fixedly connected in the annular mounting groove, and the fixed end of the electric telescopic cylinder is rotationally mounted on the mounting shaft.

[0022] Beneficial effects of the utility model:

[0023] 1. Reasonable layout of power transmission mechanism:

[0024] The transmission assembly provided by this solution has an adjusting screw that penetrates the traveling seat and is screwed to it, and the spline shaft can drive the rotating seat with an internal gear ring to operate stably through the transmission gear. This design realizes efficient power transmission in a limited space and avoids the energy loss and low transmission efficiency caused by unreasonable layout in traditional equipment.

[0025] 2. Stable operation of the working parts:

[0026] By setting a guide slot on the outer edge of the traveling seat and slidingly connecting it with the guide bracket, the traveling seat is ensured to remain stable during movement, and the rolling unit is stably installed in the annular mounting groove of the rotating seat. The structural design between the rotating seat and the traveling seat ensures the stability of the rolling unit. It effectively avoids the problem of trajectory deviation of the working parts when they move inside the composite pipe, and ensures the stability and accuracy of the forming process.

[0027] 3. Improve processing efficiency:

[0028] Due to the efficient design of the transmission assembly and the stable operation of the working parts, the molding equipment of the present invention has significantly improved the processing efficiency. The matching of the adjusting screw and the traveling seat, and the matching of the spline shaft and the rotating seat make the power transmission more direct and efficient, reduce the molding time, and improve the production efficiency.

[0029] 4. Simple structure and easy maintenance:

[0030] The coordinated operation design of the transmission assembly, the traveling seat and the rotating seat in this solution is relatively simple, which reduces the manufacturing and maintenance difficulties caused by the complex structure of traditional equipment. The screw connection method between the adjusting screw and the traveling seat and the design of the guide slide make the equipment more convenient during operation and maintenance, reducing the failure rate and maintenance cost of the equipment.

[0031] In summary, the present invention significantly improves many problems of existing lined stainless steel composite pipe forming equipment in practical applications by optimizing the layout of the power transmission mechanism, improving the stability of the working parts, improving processing efficiency and effects, and simplifying the equipment structure, and has significant technical advantages and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the utility model;

[0033] Figure 2 It is a structural schematic diagram of another perspective of the utility model;

[0034] Figure 3 It is a structural schematic diagram of the assembly seat and the components installed thereon;

[0035] Figure 4 It is a structural diagram of the supporting combination of the guide bracket, the drive motor and the transmission component;

[0036] Figure 5 For the Figure 4 A schematic diagram of the structure from another perspective;

[0037] Figure 6 It is a structural diagram of the combination of the traveling seat, the rotating seat, the rolling unit and the transmission assembly;

[0038] Figure 7 It is a structural schematic diagram of the traveling seat;

[0039] Figure 8 It is a structural schematic diagram of the matching combination of the rotating seat and the rolling unit.

[0040] In the figure: 1 guide bracket, 11 transverse guide plate, 12 longitudinal guide plate, 13 assembly pad, 14 mounting seat, 2 travel seat, 21 T-type guide groove, 22 annular assembly groove, 23 circular assembly groove, 24 transmission gear, 3 rotating seat, 31 inner ring gear, 32 annular mounting groove, 33 mounting shaft, 4 rolling unit, 41 assembly bracket, 42 roller, 43 electric telescopic cylinder, 5 drive motor, 51 coupling, 6 transmission assembly, 61 spline shaft, 62 adjusting screw, 63 synchronous wheel, 64 synchronous belt, 7 assembly seat, 71 support base, 72 mounting cavity, 81 mounting pad, 82 bolt assembly. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] See also Figure 1-8 A forming device for a lined stainless steel composite pipe fitting comprises a guide bracket 1, a traveling seat 2, a rotating seat 3, and a rolling unit 4. The guide bracket 1 is arranged in a horizontal direction, the traveling seat 2 is slidably installed on the guide bracket 1 and runs along the length direction of the guide bracket 1, the outer edge of the traveling seat 2 is a circular structure, the rotating seat 3 is an annular structure and is rotatably installed on the periphery of the traveling seat 2, and the rolling unit 4 includes a plurality of groups distributed in an annular array on the periphery of the rotating seat 3.

[0043] The rolling unit 4 includes an assembly bracket 41, a roller 42, and an electric telescopic cylinder 43. The assembly bracket 41 is rotatably installed on the outer edge of the rotating seat 3, the roller 42 is rotatably installed on the outer end of the assembly bracket 41, and the two ends of the electric telescopic cylinder 43 are respectively hinged with the assembly bracket 41 and the rotating seat 3.

[0044] It also includes a driving motor 5 and a transmission assembly 6 . The driving motor 5 is in power connection with the transmission assembly 6 . The transmission assembly 6 is assembled on the guide bracket 1 and is in power connection with the traveling seat 2 and the rotating seat 3 .

[0045] During the forming process of the lined stainless steel composite pipe fittings, the stainless steel lining pipe and the middle supporting pipe between the lining pipe and the outer steel pipe (cast iron pipe) are first assembled in sequence and effectively fixed, and then the guide bracket 1 is extended into the inner side of the pipe fitting, and the lined stainless steel pipe is rolled and formed to make the lined stainless steel pipe, the middle supporting pipe and the outer steel pipe effectively fit together.

[0046] During the processing, it is necessary to ensure that the guide bracket 1 is arranged along the axial direction of the pipe fitting, and ensure that the geometric center of the traveling seat 2 and the rotating seat 3 is on the axis of the pipe fitting. When the driving motor 5 is running, it can drive the traveling seat 2 to move along the guide bracket 1, so that the traveling seat 2 can run along the axial direction of the pipe fitting, so that the traveling seat 2 and the rotating seat 3 can pass through various places inside the pipe fitting.

[0047] By adjusting the electric telescopic cylinders 43 in each group of rolling units 4 to operate synchronously, the corresponding assembly brackets 41 can be driven to flip synchronously, so that the rollers 42 can spread outward and press the stainless steel liner pipe. The running drive motor 5 simultaneously drives the rotating seat 3 to operate, thereby driving each group of rolling units 4 to operate, and the stainless steel liner pipe, the center support pipe, and the steel pipe are pressed and fixed by means of the rollers 42 to realize the processing and forming of the lined stainless steel composite pipe fittings.

[0048] By controlling the continuous periodic operation of the driving motor 5, the traveling seat 2 can be driven to reciprocate along the lined stainless steel composite pipe under the guidance of the guide bracket 1, and the rolling unit 4 can be driven to operate through the rotating seat 3 to achieve rapid forming of the lined stainless steel composite pipe.

[0049] In order to ensure that the guide bracket 1 can be stably installed in the horizontal direction and that the traveling seat 2 can slide stably on the guide bracket 1, the following technical solution is provided.

[0050] It also includes an assembly seat 7, a horizontally arranged support base 71 is fixedly connected to the bottom of the assembly seat 7, the guide bracket 1 includes a transverse guide plate 11 and a longitudinal guide plate 12 which is vertically distributed with the transverse guide plate 11, the longitudinal guide plate 12 is fixedly connected to the center line position of the transverse guide plate 11, and a T-shaped guide groove 21 which is slidably connected with the transverse guide plate 11 and the longitudinal guide plate 12 is opened on the traveling seat 2, a vertically arranged assembly pad 13 is fixedly connected to the same end of the transverse guide plate 11 and the longitudinal guide plate 12, the assembly pad 13 is kept in contact with the front side wall of the assembly seat 7, and a mounting pad 81 is arranged in contact with the rear side wall of the assembly seat 7, and the assembly pad 13, the assembly seat 7 and the mounting pad 81 are fixedly connected by a bolt assembly 82.

[0051] A triangular reinforcing plate is provided at the connection between the assembly seat 7 and the support base 71 to enhance the stability of the fixed connection between the assembly seat 7 and the support base 71. A triangular reinforcing plate is also provided at the connection between the transverse guide plate 11, the longitudinal guide plate 12 and the assembly pad 13 to enhance the stability of the fixed connection between the transverse guide plate 11, the longitudinal guide plate 12 and the assembly pad 13 to ensure that the transverse pad and the longitudinal pad are stably arranged in the horizontal direction.

[0052] By disposing the bolt assembly 82 and the mounting pad 81 , the guide bracket 1 can be stably assembled on the assembly seat 7 in a horizontal posture, and the guide bracket 1 can be easily disassembled and maintained.

[0053] In order to ensure that the transmission assembly 6 can be stably assembled on the guide bracket 1, and to ensure that the drive motor 5 is stably installed and realizes power connection with the transmission assembly 6, the following technical solution is provided.

[0054] Two groups of mounting seats 14 arranged opposite to each other are fixedly connected to the transverse guide plate 11 . A mounting cavity 72 is defined in the mounting seat 7 . The mounting cavity 72 is arranged between the mounting pad 13 and the mounting pad 81 . The drive motor 5 is fixedly mounted in the mounting cavity 72 .

[0055] The transmission assembly 6 includes a horizontally arranged spline shaft 61 and an adjusting screw 62. The spline shaft 61 and the adjusting screw 62 are both rotatably mounted on two sets of mounting seats 14. A synchronous wheel 63 is fixedly connected to the same end of the spline shaft 61 and the adjusting screw 62. The two sets of synchronous wheels 63 are powered by a synchronous belt 64. The adjusting screw 62 or the spline shaft 61 maintains a synchronous connection with the output shaft of the drive motor 5.

[0056] The setting of the mounting seat 14 can ensure that the spline shaft 61 and the adjusting screw 62 are stably mounted on the guide bracket 1 in a relatively rotating posture. Through the matching combination of the synchronous belt 64 and the synchronous wheel 63, the synchronous operation of the spline shaft 61 and the adjusting screw 62 can be achieved.

[0057] The installation cavity 72 is provided in conjunction with the mounting pad 13 and the mounting pad 81 , so that the drive motor 5 can be stably installed on the mounting seat 7 while realizing the hidden arrangement of the drive motor 5 .

[0058] The output shaft of the drive motor 5 is coaxially arranged with the spline shaft 61 or the adjusting screw 62. The output shaft of the drive motor 5 is connected to the spline shaft 61 or the adjusting screw 62 through the coupling 51 to achieve power connection, and then the adjusting screw 62 or the spline shaft 61 that is not directly connected is replaced by the combination of the synchronous wheel 63 and the synchronous belt 64 to synchronize the operation.

[0059] In order to ensure that the transmission assembly 6 can drive the traveling seat 2 and the rotating seat 3 to operate stably, the following technical solution is provided.

[0060] The adjusting screw 62 passes through the traveling seat 2 and is rotationally connected to the traveling seat 2. An annular assembly groove 22 is provided on the outer edge of the traveling seat 2. A circular assembly groove 23 connected to the annular assembly groove 22 is also provided on the traveling seat 2. An inner gear ring 31 arranged in the annular assembly groove 22 is fixedly connected to the inner wall of the rotating seat 3. A transmission gear 24 meshing with the inner gear ring 31 is rotatably installed in the circular assembly groove 23. The spline shaft 61 passes through the axial center of the transmission gear 24 and is slidably connected to the transmission gear 24.

[0061] When the driving motor 5 drives the adjusting screw 62 and the spline shaft 61 to operate, the adjusting screw 62 can drive the traveling seat 2 to move stably along the guide. At the same time, the transmission gear 24 installed in the traveling seat 2 moves synchronously along the spline shaft 61. Due to the structural characteristics of the spline shaft 61, the operating spline shaft 61 can also drive the transmission gear 24 to operate, thereby driving the inner gear ring 31 and the rotating seat 3 to operate stably around the traveling seat 2.

[0062] In order to ensure that the rolling unit 4 can be stably assembled on the periphery of the rotating seat 3, that the rotating seat 3 can drive each rolling unit 4 to operate stably, and that each rolling unit 4 can adjust its retractable posture, the following technical solution is provided.

[0063] An annular mounting groove 32 is provided on the periphery of the rotating seat 3, and the assembly bracket 41 is arranged as a herringbone structure. The three end points of the herringbone structure are respectively rotationally connected with the annular mounting groove 32, the roller 42, and the movable end of the electric telescopic cylinder 43. A mounting shaft 33 is also fixedly connected in the annular mounting groove 32, and the fixed end of the electric telescopic cylinder 43 is rotatably mounted on the mounting shaft 33.

[0064] The provision of the annular mounting groove 32 can ensure that the assembly bracket 41 and the electric telescopic cylinder 43 are stably assembled in the rotating seat 3, and prevent the assembly bracket 41 and the electric telescopic cylinder 43 from being completely exposed from the rotating seat 3 to affect the stability of their own operation.

[0065] The assembly bracket 41 is set as a herringbone structure, which can improve the rationality of assembly and operation of the rolling unit 4 on the rotating seat 3, avoid spatial interference between the electric telescopic cylinder 43 and the rotating seat 3 during the extension and retraction process, and ensure that the electric telescopic cylinder 43 can drive the roller 42 to be stably retracted and extended when extending and retracting.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0067] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A forming device for a stainless steel lined composite pipe, characterized in that: The invention comprises a guide bracket (1), a traveling seat (2), a rotating seat (3), and a rolling unit (4), wherein the guide bracket (1) is arranged in a horizontal direction, the traveling seat (2) is slidably mounted on the guide bracket (1) and runs along the length direction of the guide bracket (1), the outer edge of the traveling seat (2) is a circular structure, the rotating seat (3) is an annular structure and is rotatably mounted on the periphery of the traveling seat (2), and the rolling unit (4) comprises a plurality of groups distributed in an annular array on the periphery of the rotating seat (3); The rolling unit (4) comprises an assembly bracket (41), a roller (42), and an electric telescopic cylinder (43); the assembly bracket (41) is rotatably mounted on the outer edge of the rotating seat (3); the roller (42) is rotatably mounted on the outer end of the assembly bracket (41); and the two ends of the electric telescopic cylinder (43) are respectively hinged to the assembly bracket (41) and the rotating seat (3); It also includes a driving motor (5) and a transmission assembly (6), wherein the driving motor (5) is in power connection with the transmission assembly (6), and the transmission assembly (6) is mounted on the guide bracket (1) and is in power connection with the traveling seat (2) and the rotating seat (3).

2. The forming equipment of a lined stainless steel composite pipe according to claim 1, characterized in that: The invention also comprises an assembly seat (7), the bottom of which is fixedly connected to a horizontally arranged support base (71), the guide bracket (1) comprises a transverse guide plate (11) and a longitudinal guide plate (12) which is vertically distributed with the transverse guide plate (11), the longitudinal guide plate (12) being fixedly connected to the center line position of the transverse guide plate (11), the travel seat (2) is provided with a T-shaped guide groove (21) which is slidably connected with the transverse guide plate (11) and the longitudinal guide plate (12), the same end of the transverse guide plate (11) and the longitudinal guide plate (12) is fixedly connected to a vertically arranged assembly pad (13), the assembly pad (13) is kept in contact with the front side wall of the assembly seat (7), the rear side wall of the assembly seat (7) is in contact with a mounting pad (81), the assembly pad (13), the assembly seat (7) and the mounting pad (81) are fixedly connected by a bolt assembly (82).

3. The forming equipment of a lined stainless steel composite pipe according to claim 2, characterized in that: The transverse guide plate (11) is fixedly connected to two groups of mounting seats (14) arranged opposite to each other, the mounting seat (7) is provided with a mounting cavity (72), the mounting cavity (72) is arranged between the mounting pad (13) and the mounting pad (81), and the drive motor (5) is fixedly mounted in the mounting cavity (72); The transmission assembly (6) comprises a horizontally arranged spline shaft (61) and an adjusting screw (62), wherein the spline shaft (61) and the adjusting screw (62) are both rotatably mounted on two sets of mounting seats (14), and a synchronous wheel (63) is fixedly connected to the same end of the spline shaft (61) and the adjusting screw (62), and the two sets of synchronous wheels (63) are dynamically connected via a synchronous belt (64), and the adjusting screw (62) or the spline shaft (61) is synchronously connected to the output shaft of the driving motor (5).

4. The forming equipment of the lined stainless steel composite pipe according to claim 3, characterized in that: The adjusting screw (62) passes through the traveling seat (2) and is rotationally connected to the traveling seat (2); an annular assembly groove (22) is provided on the outer edge of the traveling seat (2); a circular assembly groove (23) connected to the annular assembly groove (22) is also provided on the traveling seat (2); an inner gear ring (31) arranged in the annular assembly groove (22) is fixedly connected to the inner wall of the rotating seat (3); a transmission gear (24) meshing with the inner gear ring (31) is rotatably installed in the circular assembly groove (23); the spline shaft (61) passes through the axis of the transmission gear (24) and is slidably connected to the transmission gear (24).

5. The forming equipment of the lined stainless steel composite pipe according to claim 3, characterized in that: An annular mounting groove (32) is provided on the periphery of the rotating seat (3); the assembly bracket (41) is arranged in a herringbone structure; the three end points of the herringbone structure are respectively rotatably connected to the annular mounting groove (32), the roller (42), and the movable end of the electric telescopic cylinder (43); a mounting shaft (33) is also fixedly connected in the annular mounting groove (32); and the fixed end of the electric telescopic cylinder (43) is rotatably mounted on the mounting shaft (33).

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