A wire mesh skeleton cleaning device for composite pipe production

Abstract

The present invention relates to the technical field of cleaning devices, and specifically relates to a steel wire mesh skeleton cleaning device for composite pipe production, including support columns arranged on both sides of a winding machine. It also includes a transmission mechanism located at the top of the support columns, which is assembled to drive a transmission wheel fixedly connected to a connecting shaft to rotate through the movement of the steel wire mesh skeleton, causing a worm to rotate, and thus causing a worm wheel meshing with the worm to rotate; a cleaning mechanism located on one side of the transmission mechanism, enabling a brush on the inner wall of a movable collar to clean the steel wire mesh skeleton; when the steel wire mesh skeleton woven by the winding machine moves on a connecting pipe, the mesh holes of the steel wire mesh skeleton drive the transmission wheel to rotate, causing the worm to drive the worm wheel to rotate, and thus causing the movable collar to rotate within a connecting seat driven by a bevel gear. Multiple groups of brushes arranged on its inner wall brush the surface of the steel wire mesh skeleton, cleaning impurities such as dust particles adhered to the surface, avoiding excessive impurities from affecting the production of composite pipes, and without the need to use a motor, saving resources.

Description

Technical Field

[0001] The present invention relates to the technical field of cleaning devices, and more specifically, to a wire mesh skeleton cleaning device for the production of composite pipes. Background Art

[0002] The wire mesh skeleton plastic composite pipe uses a high-strength plastic-coated wire mesh skeleton and thermoplastic polyethylene as raw materials. The wire-wound mesh serves as the skeleton reinforcement of the polyethylene plastic pipe, with high-density polyethylene (HDPE) as the matrix. A high-performance HDPE modified bonding resin is used to tightly connect the wire skeleton with the inner and outer layers of high-density polyethylene, resulting in an excellent composite effect. The high-strength wire reinforcement is coated in continuous thermoplastic plastic, so this composite pipe overcomes the respective disadvantages of steel pipes and plastic pipes while maintaining their respective advantages.

[0003] When the wire mesh skeleton is being formed, the winding machine winds multiple wires into a mesh barrel shape. However, there may be some dust or impurity particles adhering to the wire surface, and the wires will also rub against other metal or non-metal guiding structures during the weaving process. Over time, small debris is likely to be generated. Dust or impurity particles and the debris generated by rubbing all protrude from the surface of the wire mesh skeleton. Therefore, when using the bonding resin to connect the high-density polyethylene with the inner and outer layers of the wire mesh skeleton, the wall thickness of the composite pipe is limited. If the particle impurities are large, it may cause the problem of insufficient adhesion between the composite pipe and the high-density polyethylene after production, thus affecting the quality of the composite pipe. At the same time, the adhesion between the impurities and the wire is poor. If there are too many impurities on the wire, it will affect the quality of the composite pipe and also result in a low tightness of the adhesion between the high-density polyethylene and the wire. However, it is rather troublesome to clean the entire wire mesh skeleton after it is made, and if a separate cleaning device is needed to clean it, the processing efficiency will be reduced.

[0004] Therefore, the present invention provides a wire mesh skeleton cleaning device that can be used on the composite pipe production line. Summary of the Invention

[0005] Aiming at the problem that it is inconvenient to clean the wire mesh skeleton after production in the prior art, the present invention provides a wire mesh skeleton cleaning device for the production of composite pipes, which cleans the dust, particulate impurities adhering to the surface of the wire mesh skeleton during the production process of the wire mesh skeleton.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a wire mesh skeleton cleaning device for the production of composite pipes, including support columns arranged on both sides of the winding machine, and also including

[0007] The transmission mechanism located at the top of the support column includes a worm and connecting shafts fixedly connected to both ends of the worm. It is assembled to drive the transmission wheel fixedly connected to the connecting shaft to rotate through the movement of the wire mesh skeleton, causing the worm to rotate, and thus causing the worm gear meshing with the worm to rotate, providing power support for the cleaning mechanism;

[0008] The transmission wheel is fixedly provided with special-shaped teeth on its outer side. It is assembled such that the ends of the special-shaped teeth cooperate with the mesh holes of the wire mesh skeleton, so that the movement of the wire mesh skeleton drives the transmission wheel to rotate;

[0009] The cleaning mechanism located on one side of the transmission mechanism is assembled to drive the movable collar to rotate through the bevel gear fixed to the bottom of the worm gear, so that the brush on the inner wall of the movable collar cleans the wire mesh skeleton;

[0010] The collection box is arranged at the bottom of the movable collar for collecting the impurities and particles cleaned out.

[0011] Preferably, a connecting pipe is installed at one end of the winding machine, and a support seat is fixedly installed at the top of the support column, and the support seat cooperates with the winding machine.

[0012] Preferably, the transmission mechanism further includes a support frame fixedly connected to the top of the support column. The connecting shafts are rotatably connected to the opposite side walls at the upper end of the support frame. A fixed shaft is fixedly connected to the top of the support frame, and the fixed shaft is rotatably connected to the worm gear.

[0013] Preferably, the transmission wheels are symmetrically arranged and are respectively located on both sides of the worm, and all the special-shaped teeth cooperate with the wire mesh skeleton.

[0014] Preferably, the cleaning mechanism further includes a connecting seat installed at the top of the support column. The connecting seat includes a fixed base fixedly connected to the top of the support column. A connecting ring is fixedly connected to the top of the fixed base. A connecting groove is opened at the top of the fixed base. A placement bin is also arranged inside the fixed base. The placement bin is communicated with the connecting groove, and the placement bin is slidably connected to the collection box.

[0015] Preferably, a helical gear ring is fixedly arranged on the side of the movable collar close to the transmission mechanism. The helical gear ring meshes with the bevel gear. A through groove is opened on the side wall of the movable collar, and annular baffles are respectively arranged on both sides of the brush.

[0016] Preferably, the annular baffles are fixedly connected to the inner wall of the movable collar, and the sides of the annular baffles away from the movable collar are all inclined towards the brush.

[0017] Preferably, the movable collar is located inside the connecting ring, and the movable collar is rotatably connected to the connecting seat.

[0018] Preferably, one set of the brush and the through groove are provided and arranged staggeredly. One end of the brush is fixedly connected to the inner wall of the movable collar, and the other end is in contact with the wire mesh skeleton.

[0019] Preferably, a guide plate is provided at the connection between the fixed base and the connecting ring, and the lower end of the guide plate is fixedly connected to the side wall of the connecting groove.

[0020] Advantages of the present invention:

[0021] (1) For the wire mesh skeleton cleaning device for composite pipe production of the present invention, when the wire mesh skeleton woven by the winding machine moves on the connecting pipe, the mesh holes of the wire mesh skeleton drive the driving wheel to rotate, so that the worm drives the worm wheel to rotate, and thus the movable collar rotates in the connecting seat driven by the bevel gear. Multiple groups of brushes provided on its inner wall rotate and clean the surface of the wire mesh skeleton, cleaning impurities such as dust particles adhered to the surface, separating the dust impurities from the wire mesh skeleton, avoiding excessive impurities from affecting the production quality of the composite pipe, and being able to utilize the power of the movement of the wire mesh skeleton during weaving, so that the device does not need to use an additional motor to provide power when cleaning the wire mesh skeleton, saving resources.

[0022] (2) For the wire mesh skeleton cleaning device for composite pipe production of the present invention, the dust particles on the surface of the wire mesh skeleton are scraped off and separated from the wire mesh skeleton, falling into the movable collar, moving downward below the movable collar, and falling into the collection box through the through groove on the movable collar. Some dust particles fall into the through groove. Similarly, when the movable collar rotates, the through groove rotates to the connecting groove, and the internal dust particles can fall into the collection box, avoiding the particles remaining in the movable collar after cleaning. Description of the Drawings

[0023] The present invention will be further described below with reference to the drawings and embodiments.

[0024] Figure 1 It is the overall structural schematic diagram provided by the present invention;

[0025] Figure 2 It is the connection schematic diagram of the transmission mechanism and the support column provided by the present invention;

[0026] Figure 3 For Figure 2 the enlarged view at A of

[0027] Figure 4 It is the connection schematic diagram of the support column with the transmission mechanism and the cleaning mechanism provided by the present invention;

[0028] Figure 5 It is the connection schematic diagram of the movable collar and the connecting seat provided by the present invention;

[0029] Figure 6Schematic diagram of the cleaning mechanism provided by the present invention;

[0030] Figure 7 Schematic diagram of the connection between the transmission mechanism and the movable collar provided by the present invention;

[0031] Figure 8 Side view of the connection between the transmission mechanism and the movable collar provided by the present invention;

[0032] Figure 9 Schematic diagram of the connection between the movable collar and the annular baffle provided by the present invention.

[0033] In the figure: 1, support column; 2, support base; 3, connecting pipe; 4, transmission mechanism; 41, support frame; 42, worm; 421, connecting shaft; 43, transmission wheel; 431, special-shaped teeth; 44, fixed shaft; 45, worm gear; 46, bevel gear; 5, cleaning mechanism; 51, connecting seat; 511, fixed base; 512, connecting ring; 52, connecting groove; 53, placement bin; 54, guide plate; 55, collection box; 56, movable collar; 57, helical gear ring; 58, brush; 59, through groove; 510, annular baffle. Detailed implementation manners

[0034] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners. Embodiment

[0035] As Figures 1-9 shown, a wire mesh skeleton cleaning device for composite pipe production according to the present invention includes support columns 1 arranged on both sides of a winding machine, and further includes a transmission mechanism 4 located at the top of the support columns 1, which includes a worm 42 and connecting shafts 421 fixedly connected to both ends of the worm 42, and is assembled to drive a transmission wheel 43 fixedly connected to the connecting shaft 421 to rotate through the movement of the wire mesh skeleton, so that the worm 42 rotates, thereby causing a worm gear 45 meshing with the worm 42 to rotate, for providing power support for the cleaning mechanism 5; a transmission wheel 43, on the outer side of which special-shaped teeth 431 are fixedly arranged, and is assembled such that the ends of the special-shaped teeth 431 cooperate with the mesh holes of the wire mesh skeleton, so that the transmission wheel 43 rotates when the wire mesh skeleton moves; a cleaning mechanism 5 located on one side of the transmission mechanism 4, which is assembled to drive a movable collar 56 to rotate through a bevel gear 46 fixed to the bottom of the worm gear 45, so that a brush 58 on the inner wall of the movable collar 56 cleans the wire mesh skeleton; a collection box 55, which is arranged at the bottom of the movable collar 56 for collecting the cleaned impurity particles.

[0036] In this embodiment, after the wire mesh winding machine makes the wire mesh into a wire mesh framework, the completed wire mesh framework moves forward. The brush 58 on the inner wall of the movable collar 56 sweeps the wire mesh framework. At the same time, the special-shaped teeth 431 on the transmission wheel 43 are rotated by the mesh holes, so that the transmission wheel 43 drives the worm 42 to rotate. The worm gear 45 engaged with the worm 42 rotates accordingly. Therefore, the helical gear ring 57 engaged with the bevel gear 46 at the bottom of the worm gear 45 is driven to rotate. When the movable collar 56 rotates, the brush 58 on its inner wall rotates and cleans on the surface of the moving wire mesh framework, sweeping away the adhered granular impurities and separating them from the wire mesh framework, so as to facilitate further cleaning later. The removed granular impurities fall below the movable collar 56 and drop into the collection box 55 through the through groove 59 located below, collecting the granular impurities to a certain extent and preventing the removed granular impurities from staying in the movable collar 56 and affecting subsequent use. The dust and granular impurities are cleaned during the production process of the wire mesh framework without using a separate motor alone, reducing costs.

[0037] As Figures 1-4 shown, a connecting pipe 3 is installed at one end of the winding machine. A support base 2 is fixedly installed at the top of the support column 1, and the support base 2 cooperates with the winding machine; the transmission mechanism 4 further includes a support frame 41 fixedly connected to the top of the support column 1. The connecting shaft 421 is rotatably connected to the opposite side walls at the upper end of the support frame 41. A fixed shaft 44 is fixedly connected to the top of the support frame 41, and the fixed shaft 44 is rotatably connected to the worm gear 45; the transmission wheels 43 are symmetrically arranged and are respectively located on both sides of the worm 42, and the special-shaped teeth 431 are all matched with the wire mesh framework; a helical gear ring 57 is fixedly arranged on one side of the movable collar 56 close to the transmission mechanism 4, and the helical gear ring 57 is engaged with the bevel gear 46. A through groove 59 is formed in the side wall of the movable collar 56, and annular baffles 510 are respectively arranged on both sides of the brush 58.

[0038] In this embodiment, the winding machine braids multiple steel wires into a formed shape. The connecting pipe 3 provides internal support for the steel wire mesh framework to prevent the steel wire mesh framework from deforming. The completed steel wire mesh framework continues to move forward and rub on the connecting pipe 3. The connecting pipe 3 can also play a certain role in cleaning the inner wall of the steel wire mesh framework. When rubbing, the particulate impurities are separated from the steel wire mesh framework. At the part where the special-shaped teeth 431 on the driving wheel 43 contact the steel wire mesh framework, the tip of the special-shaped teeth 431 can be set to extend into the mesh holes of the steel wire mesh framework of different sizes and cooperate with it. When the steel wire mesh framework moves, the mesh holes on the steel wire mesh framework drive the special-shaped teeth 431 on the driving wheel 43 and the driving wheel 43 to rotate. The driving wheels 43 on both sides of the worm 42 always cooperate with the steel wire mesh framework. When the driving wheel 43 rotates, it drives the connecting shaft 421 to rotate on the support frame 41. When the worm 42 rotates, it drives the worm gear 45 meshing with the worm 42 to rotate. The helical gear ring 57 provided on one side of the movable collar 56 meshes with the bevel gear 46 fixedly connected to the bottom of the worm gear 45. Therefore, when the steel wire mesh framework moves, it can make the worm gear 45 rotate through the driving wheel 43 to provide power for the cleaning mechanism 5. After the steel wire mesh framework is braided, its moving speed is relatively slow. Therefore, the rotating speed of the driving wheel 43 is also relatively slow. Similarly, the rotating speed of the movable collar 56 is also slow, and it will not cause the dust particles to fly rapidly.

[0039] As Figures 4-9 shown, the cleaning mechanism 5 further includes a connecting seat 51 installed on the top of the support column 1. The connecting seat 51 includes a fixed base 511 fixedly connected to the top of the support column 1. A connecting ring 512 is fixedly connected to the top of the fixed base 511. A connecting groove 52 is opened on the top of the fixed base 511. A placement bin 53 is further provided in the fixed base 511. The placement bin 53 is communicated with the connecting groove 52. The placement bin 53 is slidably connected to the collection box 55; a helical gear ring 57 is fixedly provided on one side of the movable collar 56 close to the transmission mechanism 4. The helical gear ring 57 meshes with the bevel gear 46. A through groove 59 is opened on the side wall of the movable collar 56. Annular baffles 510 are respectively provided on both sides of the brush 58; the annular baffles 510 are fixedly connected to the inner wall of the movable collar 56. The sides of the annular baffles 510 away from the movable collar 56 are inclined towards the brush 58.

[0040] The bevel gear ring 57 provided on one side of the movable collar 56 meshes with the bevel gear 46 fixedly connected to the bottom of the worm gear 45. Therefore, when the wire mesh frame moves, the bevel gear 46 can be rotated by the transmission wheel 43, and the movable collar 56 rotates accordingly. The movable collar 56 is rotatably connected to the connecting seat 51, and the connecting seat 51 supports the movable collar 56. When the movable collar 56 rotates, the movable collar 56 rotates inside the connecting seat 51. The multiple groups of brushes 58 provided on the inner wall of the movable collar 56 clean the surface of the wire mesh frame as they rotate with the movable collar 56. While the brushes 58 rotate and sweep the wire mesh frame, the wire mesh frame itself is also moving, which can strengthen the cleaning force of the brushes 58 on the wire mesh frame and sweep away the dust particles adhered to its surface. After the dust particles are separated from the wire mesh frame, they fall to the bottom of the movable collar 56. At this time, they can be removed by the brushes located at the movable collar 56. The through slot 59 below falls into the collection box 55. Some dust particles that have not fallen under the movable ring 56 may enter the through slot 59 under the rotation of the movable ring 56. As the movable ring 56 continues to rotate, the through slot 59 rotates to the bottom and communicates with the connecting slot 52 opened on the fixed base 511. The dust particles inside it therefore fall into the collection box 55, and the dust particles generated by cleaning are collected to avoid accumulation in the movable ring 56. The inclined annular baffles 510 arranged on both sides of the brush 58 can, to a certain extent, prevent the flying of dust particles when the brush 58 is sweeping, so that the cleaned dust particles are collected in the collection box 55 as much as possible. The collection box 55 is slidably connected to the fixed base 511 and is placed in the placement bin 53 during operation. When cleaning is needed, the collection box 55 can be pulled out to remove the dust particles collected inside it.

[0041] like Figures 4-6 As shown, the movable ring 56 is located inside the connecting ring 512, and the movable ring 56 is rotatably connected to the connecting base 51; the brush 58 and the through groove 59 are both set as a group and are staggered, one end of the brush 58 is fixedly connected to the inner wall of the movable ring 56, and the other end is in contact with the wire mesh skeleton; a guide plate 54 is provided at the connection between the fixed base 511 and the connecting ring 512, and the lower end of the guide plate 54 is fixedly connected to the side wall of the connecting groove 52.

[0042] In this embodiment, there are multiple brushes 58 on the inner wall of the movable collar 56, and antistatic materials can be used to avoid the generation of static electricity due to long-term frictional contact with the steel wire mesh skeleton, which may affect the cleaning effect. A through groove 59 is provided between every two adjacent brushes 58. When the movable collar 56 rotates, the brushes 58 clean the surface of the steel wire mesh skeleton, sweeping away the adhered dust particles. After the particulate impurities are separated from the steel wire mesh skeleton, they fall to the lower position of the movable collar 56 and fall into the collection box 55 through the through groove 59 located at the lower position of the movable collar 56 and communicating with the connection groove 52. The guide plate 54 can guide the particulate impurities into the collection box 55. When the movable collar 56 rotates, there may be some particulate impurities that are blocked by the brushes 58 and fail to fall to the lower part of the movable collar 56 in time and enter the through groove 59. When the through groove 59 moves above the steel wire mesh skeleton under the continuous rotation of the movable collar 56, the dust particulate impurities inside it fall out. Some fall below the movable collar 56, and some may fall on the steel wire mesh skeleton. The through groove 59 originally located in the middle and lower part of the movable collar 56, when the movable collar 56 drives it to rotate towards the connection groove 52, when the through groove 59 communicates with the connection groove 52, the impurity particles inside it fall into the collection box 55. After being cleaned by the cleaning mechanism 5, the dust particulate impurities adhered to the surface of the steel wire mesh skeleton are separated from it, facilitating subsequent further cleaning.

[0043] Working principle: During use, the winding machine weaves steel wires into a steel wire mesh skeleton. The connecting pipe 3 is used to internally support the steel wire mesh skeleton. The woven steel wire mesh skeleton continues to move forward. During the movement, the friction between the steel wire mesh skeleton and the connecting pipe 3 can clean the inside of the steel wire mesh skeleton to a certain extent, separating the internally adhered impurities from the steel wire mesh skeleton. At the same time, the mesh holes on the steel wire mesh skeleton drive the special-shaped teeth 431 on the transmission wheel 43 to rotate, thus causing the worm 42 fixedly connected to the transmission wheel 43 to rotate. The worm 42 meshes with the worm gear 45, thus driving the worm gear 45 and the bevel gear 46 to rotate;

[0044] The bevel gear 46 meshes with the helical gear ring 57 on the movable collar 56. Therefore, when the wire mesh skeleton moves, the movable collar 56 rotates. Multiple groups of brushes 58 arranged on the inner wall of the movable collar 56 brush the surface of the wire mesh skeleton, sweeping away the dust particles adhered to its surface. The dust particles fall below the movable collar 56 and drop into the collection box 55 through the through groove 59. Some dust particles that fail to drop into the collection box 55 may fall into the through groove 59 under the rotation of the movable collar 56. When the movable collar 56 continues to rotate, the dust particles in the through groove 59 move along with the through groove 59. When it rotates above the guide plate 54, the dust particles in the through groove 59 drop into the collection box 55, collecting the particulate impurities generated during cleaning and preventing them from accumulating in the movable collar 56, which may affect the subsequent cleaning effect. At the same time, by pulling out the collection box 55, the impurities in the collection box 55 can be processed.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel wire mesh skeleton cleaning device for composite pipe production, including support columns (1) arranged on both sides of a winding machine, characterized in that: It also includes a transmission mechanism (4) located at the top of the support column (1), which includes a worm (42) and connecting shafts (421) fixedly connected to both ends of the worm (42). It is assembled to drive a transmission wheel (43) fixedly connected to the connecting shaft (421) to rotate through the movement of the wire mesh skeleton, so that the worm (42) rotates, and then the worm gear (45) meshing with the worm (42) rotates to provide power support for the cleaning mechanism (5); a transmission wheel (43) with special-shaped teeth (431) fixedly arranged on the outside thereof. It is assembled such that the ends of the special-shaped teeth (431) cooperate with the mesh holes of the wire mesh skeleton, so that the movement of the wire mesh skeleton drives the transmission wheel (43) to rotate; a cleaning mechanism (5) located on one side of the transmission mechanism (4). It is assembled to drive a movable collar (56) to rotate through a bevel gear (46) fixed to the bottom of the worm gear (45), so that the brush (58) on the inner wall of the movable collar (56) cleans the wire mesh skeleton; a collection box (55) which is arranged at the bottom of the movable collar (56) for collecting the cleaned garbage; The transmission mechanism (4) further includes a support frame (41) fixedly connected to the top of the support column (1). The connecting shafts (421) are rotatably connected to the opposite side walls at the upper end of the support frame (41). A fixed shaft (44) is fixedly connected to the top of the support frame (41), and the fixed shaft (44) is rotatably connected to the worm gear (45); The transmission wheels (43) are symmetrically arranged and are respectively located on both sides of the worm (42), and the special-shaped teeth (431) are all matched with the wire mesh skeleton; One side of the movable collar (56) close to the transmission mechanism (4) is fixedly provided with a helical gear ring (57), and the helical gear ring (57) meshes with the bevel gear (46).

2. The wire mesh skeleton cleaning device for the production of composite pipes according to claim 1, characterized in that: One end of the winding machine is provided with a connecting pipe (3), and a support seat (2) is fixedly installed at the top of the support column (1), and the support seat (2) cooperates with the winding machine.

3. The wire mesh skeleton cleaning device for the production of composite pipes according to claim 1, characterized in that: The cleaning mechanism (5) further includes a connecting seat (51) installed on the top of the support column (1). The connecting seat (51) includes a fixed base (511) fixedly connected to the top of the support column (1). A connecting ring (512) is fixedly connected to the top of the fixed base (511). A connecting groove (52) is formed in the top of the fixed base (511). A placement bin (53) is further arranged in the fixed base (511). The placement bin (53) communicates with the connecting groove (52), and the placement bin (53) is slidably connected to the collection box (55).

4. A steel wire mesh skeleton cleaning device for composite pipe production according to claim 1, characterized in that: A through groove (59) is formed in the side wall of the movable collar (56), and annular baffles (510) are respectively arranged on both sides of the brush (58).

5. The wire mesh skeleton cleaning device for the production of composite pipes according to claim 4, characterized in that: The annular baffles (510) are fixedly connected to the inner wall of the movable collar (56), and the sides of the annular baffles (510) away from the movable collar (56) are inclined towards the brush (58).

6. The wire mesh skeleton cleaning device for the production of composite pipes according to claim 5, characterized in that: The movable collar (56) is located inside the connecting ring (512), and the movable collar (56) is rotatably connected to the connecting seat (51).

7. A steel wire mesh skeleton cleaning device for composite pipe production according to claim 4, characterized in that: The brush (58) and the through groove (59) are both provided as a set and are arranged staggeredly. One end of the brush (58) is fixedly connected to the inner wall of the movable collar (56), and the other end is in contact with the wire mesh skeleton.

8. A wire mesh skeleton cleaning device for composite pipe production according to claim 3, characterized in that: A guide plate (54) is provided at the connection between the fixed base (511) and the connecting ring (512). The lower end of the guide plate (54) is fixedly connected to the side wall of the connecting groove (52).

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