High-precision energy-saving two-roller cross piercing unit

Abstract

The invention discloses a high-precision energy-saving two-roller cross piercing unit, and relates to the technical field of seamless steel tube machining. The mounting seat is fixedly mounted on the table top of the base; the supporting plate is fixedly connected to one side, in the length direction, of the mounting base, and a first motor is arranged on one side, opposite to the mounting base, of the supporting plate. The first motor arranged on one side of the mounting base drives the connecting rod to rotate, and the first connecting base mounted in the mounting base moves oppositely under rotation of the connecting rod through threads; the distance between the two sets of lower clamping plates and upper clamping plates is adjusted to adapt to the length specification of the steel pipe, then the steel pipe to be machined is placed on the surfaces of the lower clamping plates, first electric push rods arranged on the top faces of the lower connecting plates are shrunk to drive the upper connecting plates and the upper clamping plates to move downwards, and then rapid fixing of the steel pipe is completed. And automatic fastening of the steel pipe is achieved, manual operation is not needed, the requirement of a continuous production line is met, and then the practicability of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe processing technology, and more specifically, to a high-precision, energy-saving two-roll skew rolling piercing mill. Background Technology

[0002] Seamless steel pipes are made by piercing a whole round steel billet. They are steel pipes without weld seams on the surface. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and top-mounted pipes. According to the cross-sectional shape, seamless steel pipes are divided into round and irregular shapes. In the production process of seamless steel pipes, a piercing machine is used to pierce the steel billet.

[0003] Existing perforating machines often fix steel pipes by rotating a connecting rod to adjust the screw and clamp, but the whole process requires manual operation and lacks a drive structure, which can easily lead to slow adjustment speed and low precision. This makes them unsuitable for the needs of continuous production lines and reduces the practicality of the equipment to some extent. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a high-precision energy-saving two-roll skew rolling piercing mill unit, which realizes automatic fastening of steel pipes without manual operation, simplifies the steel pipe fixing process, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-precision, energy-saving two-roll skew rolling piercing mill, comprising...

[0006] Base;

[0007] Mounting base, the mounting base being fixedly mounted on the platform of the base;

[0008] A support plate is fixedly connected to one side of the mounting base along its length. A motor is provided on one side of the support plate opposite to the mounting base. A connecting rod is fixedly connected to the drive shaft of the motor. The surface of the connecting rod is rotatably connected to the inner wall of the mounting base, and a portion of the surface of the connecting rod is threaded.

[0009] A connecting seat 1 has its inner wall threadedly connected to the surface of a connecting rod. The side of the connecting seat 1 is fitted against the inner wall of a mounting seat. A mounting post is fixedly installed on the top surface of the connecting seat 1. A lower clamping plate is provided on the top of the mounting post. Lower connecting plates are provided opposite to each other on the left and right sides of the lower clamping plate. An electric push rod 1 is fixedly installed on the top surface of the lower connecting plate. An upper connecting plate is fixedly connected to the top of the electric push rod 1. An upper clamping plate is fixedly connected to the side of the upper connecting plate.

[0010] In a preferred embodiment, an adhesive pad is further included, which is disposed on the surfaces of the lower clamping plate and the upper clamping plate.

[0011] In a preferred embodiment, the device further includes a second electric push rod, a second connecting seat, and a stop wheel. The second electric push rod is fixedly installed inside the mounting column, the bottom surface of the second connecting seat is fixedly connected to the top surface of the second electric push rod, and the stop wheel is rotatably installed on the top surface of the second connecting seat.

[0012] In a preferred embodiment, a rotating assembly is further included, which is disposed on the top surface of the mounting base.

[0013] In a preferred embodiment, the rotating assembly includes a support platform, a connecting shaft, a first mounting plate, a fixed ring, a rotating roller, a base plate, and a second motor. The support platform is fixedly mounted on the top surface of the mounting base. The surface of the connecting shaft is roughened and is rotatably mounted on the surface of the support platform. The bottom end of the first mounting plate is fixedly connected to the surface of the connecting shaft. The fixed ring is fixedly mounted on the top end of the first mounting plate. One side of the rotating roller along its length is rotatably connected to the inner ring of the fixed ring. The base plate is fixedly mounted on one side of the fixed ring. The second motor is located on the top surface of the base plate, and the drive shaft of the second motor is fixedly connected to one end of the rotating roller.

[0014] In a preferred embodiment, the system further includes receiving grooves formed on both sides of the support platform surface.

[0015] In a preferred embodiment, the system further includes a fixed base, a second mounting plate, a spring, a fixed plate, and a mounting shaft. The fixed base is fixedly mounted on the top surface of the support platform, the second mounting plate is slidably mounted on the side of the fixed base, one end of the spring is fixedly connected to the surface of the second mounting plate, the other end of the spring is fixedly connected to the surface of the fixed plate, and the mounting shaft is fixedly mounted on the side of the fixed plate. One end of the mounting shaft relative to the fixed plate is rotatably connected to the surface of the first mounting plate.

[0016] In a preferred embodiment, a chip collection assembly is also included, which is disposed on top of the mounting base.

[0017] In a preferred embodiment, the chip collection assembly includes a fixed frame, side plates, fixed columns, guide rods, connecting blocks, and baffles. The fixed frame is fixedly installed on the surface of the support platform. The side plates are arranged opposite each other on both sides of the fixed frame in the width direction. One end of the fixed column is fixedly connected to the surface of the side plate. The guide rod is movably installed inside the fixed column, and one end of the guide rod is fixedly connected to the surface of the connecting block. The baffle is slidably installed inside the fixed frame. One side of the baffle is in contact with the inside of the receiving groove, and the other side of the baffle is fixedly connected to the surface of the mounting column. The connecting blocks are fixedly installed on the left and right sides of the baffle, and the surface of the connecting blocks is fixedly connected to one end of the guide rod opposite the fixed column.

[0018] In a preferred embodiment, the system further includes an installation chamber, a collection box, a fan, a connecting pipe, and an absorption chamber. The installation chamber is fixedly installed on the side of the support platform. The collection box is detachably installed inside the installation chamber, with its top open. The fan is fixedly installed on the top of the installation chamber, with its port penetrating the top surface of the installation chamber and communicating with the collection box. One end of the connecting pipe penetrates the side of the installation chamber and communicates with the collection box, while the other end of the connecting pipe communicates with the side of the absorption chamber. The absorption chamber is located on the top surface of the fixed frame.

[0019] The technical effects and advantages of this invention are as follows:

[0020] 1. This invention uses a motor located on one side of the mounting base to drive a connecting rod to rotate. Utilizing a threaded connection, a connecting seat installed inside the mounting base moves towards each other under the rotation of the connecting rod, adjusting the distance between the two sets of lower and upper clamping plates to accommodate the length specifications of the steel pipe. The steel pipe to be processed is then placed on the surface of the lower clamping plate. An electric push rod located on the top surface of the lower connecting plate retracts, causing the upper connecting plate and upper clamping plate to move downwards, bringing the surface of the upper clamping plate into contact with the surface of the steel pipe. This completes the rapid fixing of the steel pipe, achieving automatic fastening without manual operation, simplifying the steel pipe fixing process, adapting to the needs of continuous production lines, and thus improving the practicality of the device.

[0021] 2. This invention, by setting the steel pipe to fit against the surface of the rotating roller when placed above the lower clamping plate, allows the rotating roller to rotate around the connecting shaft when the upper clamping plate moves down to secure the steel pipe. This adjusts the distance between the two rotating rollers to accommodate the fixed position of the steel pipe. When the steel pipe comes loose, the rotating rollers reset under the elastic action of the spring, lifting the entire steel pipe. At this time, the electric push rod 2, located in the mounting column, extends and moves the connecting seat 2 upward, causing the abutment wheel to fit against the bottom of the side end of the steel pipe for auxiliary support. Subsequently, the motor 2 drives the rotating roller to rotate and adjust the steel pipe, allowing it to be flipped and adjusted according to processing requirements. This enables the processing position to quickly align with the processing mechanism, further reducing the degree of human intervention.

[0022] 3. This invention uses a baffle plate positioned above the mounting base slide groove to block debris generated during processing. When the mounting column moves horizontally, it pushes the baffle plate to move synchronously, uniformly pushing the blocked debris to the opening of the absorption chamber. At this point, the installed fan uses its generated airflow to absorb the debris through the absorption chamber. The debris then enters the collection box through the connecting pipe for temporary storage, thus completing the unified collection of debris. This achieves both blocking and collection of debris, preventing it from falling into the mounting base slide groove and affecting the horizontal movement of the connecting base, further improving the practicality of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the three-dimensional assembly structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the mounting column, lower clamping plate, and upper clamping plate of the present invention.

[0026] Figure 4 This is a schematic diagram of the rotating component structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the structure of the fixing base, spring, and fixing plate of the present invention.

[0028] Figure 6 This is a schematic diagram of the chip collection assembly structure of the present invention.

[0029] The attached diagram is labeled as follows: 1. Base; 2. Mounting seat; 3. Support plate; 4. Motor 1; 5. Connecting rod; 6. Connecting seat 1; 7. Mounting column; 8. Lower clamping plate; 9. Lower connecting plate; 10. Electric push rod 1; 11. Upper connecting plate; 12. Upper clamping plate; 13. Fitting pad; 14. Electric push rod 2; 15. Connecting seat 2; 16. Abutting wheel; 17. Rotating assembly; 171. Support platform; 172. Connecting shaft; 173. Mounting plate 1; 174. Fixing ring; 175. Rotating element. 176. Roller; 177. Base plate; 178. Motor II; 179. Receiving groove; 1710. Fixing seat; 1711. Mounting plate II; 1712. Spring; 1713. Fixing plate; 1714. Mounting shaft; 18. Chip collection assembly; 181. Fixing frame; 182. Side plate; 183. Fixing column; 184. Guide rod; 185. Connecting block; 186. Baffle; 187. Installation chamber; 188. Collection box; 189. Fan; 1810. Connecting pipe; 1811. Absorption chamber. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] As attached Figure 1-6 The high-precision, energy-saving two-roll skew rolling piercing mill shown includes...

[0032] Base 1;

[0033] Mounting base 2 is fixedly mounted on the platform of base 1;

[0034] Support plate 3 is fixedly connected to one side of the mounting base 2 along its length. A motor 4 is provided on one side of the support plate 3 relative to the mounting base 2. A connecting rod 5 is fixedly connected to the drive shaft of the motor 4. The surface of the connecting rod 5 is rotatably connected to the inner wall of the mounting base 2, and a portion of the surface of the connecting rod 5 is threaded.

[0035] Connecting seat 6, the inner wall of connecting seat 6 is threaded to the surface of connecting rod 5, the side of connecting seat 6 is in contact with the inner wall of mounting seat 2, mounting post 7 is fixedly installed on the top surface of connecting seat 6, a lower clamping plate 8 is provided on the top of mounting post 7, a lower connecting plate 9 is provided on the left and right sides of lower clamping plate 8, an electric push rod 10 is fixedly installed on the top surface of lower connecting plate 9, an upper connecting plate 11 is fixedly connected to the top of electric push rod 10, and an upper clamping plate 12 is fixedly connected to the side of upper connecting plate 11.

[0036] In a preferred embodiment, it also includes a bonding pad 13, which is disposed on the surfaces of the lower clamping plate 8 and the upper clamping plate 12. When the upper clamping plate 12 moves down to cooperate with the lower clamping plate 8 to fix the steel pipe, the bonding pad 13 can increase the friction between the two and the surface of the steel pipe, thereby further fixing the steel pipe.

[0037] In a preferred embodiment, the device further includes an electric push rod 14, a connecting seat 15, and an abutting wheel 16. The electric push rod 14 is fixedly installed inside the mounting column 7. The bottom surface of the connecting seat 15 is fixedly connected to the top surface of the electric push rod 14. The abutting wheel 16 is rotatably installed on the top surface of the connecting seat 15.

[0038] In a preferred embodiment, a rotating assembly 17 is also included, which is disposed on the top surface of the mounting base 2.

[0039] In a preferred embodiment, the rotating assembly 17 includes a support platform 171, a connecting shaft 172, a mounting plate 173, a fixing ring 174, a rotating roller 175, a base plate 176, and a motor 177. The support platform 171 is fixedly mounted on the top surface of the mounting base 2. The surface of the connecting shaft 172 is roughened, and the connecting shaft 172 is rotatably mounted on the surface of the support platform 171. The bottom end of the mounting plate 173 is fixedly connected to the surface of the connecting shaft 172. The fixing ring 174 is fixedly mounted on the top end of the mounting plate 173. One side of the rotating roller 175 in the length direction is rotatably connected to the inner ring of the fixing ring 174. The base plate 176 is fixedly mounted on one side of the fixing ring 174. The motor 177 is disposed on the top surface of the base plate 176, and the drive shaft of the motor 177 is fixedly connected to one end of the rotating roller 175.

[0040] In a preferred embodiment, it further includes receiving grooves 178, which are formed on both sides of the surface of the support platform 171.

[0041] In a preferred embodiment, the system further includes a fixed base 179, a second mounting plate 1710, a spring 1711, a fixed plate 1712, and a mounting shaft 1713. The fixed base 179 is fixedly mounted on the top surface of the support platform 171. The second mounting plate 1710 is slidably mounted on the side of the fixed base 179. One end of the spring 1711 is fixedly connected to the surface of the second mounting plate 1710, and the other end of the spring 1711 is fixedly connected to the surface of the fixed plate 1712. The mounting shaft 1713 is fixedly mounted on the side of the fixed plate 1712, and one end of the mounting shaft 1713 relative to the fixed plate 1712 is rotatably connected to the surface of the first mounting plate 1713.

[0042] In a preferred embodiment, a chip collection assembly 18 is also included, which is disposed on the top of the mounting base 2.

[0043] In a preferred embodiment, the chip collection assembly 18 includes a fixing frame 181, side plates 182, fixing posts 183, guide rods 184, connecting blocks 185, and baffles 186. The fixing frame 181 is fixedly installed on the surface of the support platform 171. The side plates 182 are arranged opposite each other on both sides of the fixing frame 181 in the width direction. One end of the fixing post 183 is fixedly connected to the surface of the side plate 182. The guide rod 184 is movably installed inside the fixing post 183, and one end of the guide rod 184 is fixedly connected to the surface of the connecting block 185. The baffle 186 is slidably installed... Inside the mounting bracket 181, one side of the baffle 186 fits against the inside of the receiving groove 178, and the other side of the baffle 186 is fixedly connected to the surface of the mounting post 7. The connecting block 185 is fixedly installed on the left and right sides of the baffle 186, and the surface of the connecting block 185 is fixedly connected to one end of the guide rod 184 relative to the fixed post 183. Through the baffle 186, which covers the top of the sliding groove of the mounting base 2, the debris generated during the processing can be blocked, preventing the debris from entering the sliding groove and affecting the horizontal movement of the connecting base 6.

[0044] In a preferred embodiment, the system further includes an installation chamber 187, a collection box 188, a fan 189, a connecting pipe 1810, and an absorption chamber 1811. The installation chamber 187 is fixedly installed on the side of the support platform 171. The collection box 188 is detachably installed inside the installation chamber 187, with its top open. The fan 189 is fixedly installed on the top of the installation chamber 187, with its port penetrating the top surface of the installation chamber 187 and communicating with the collection box 188. One end of the connecting pipe 1810 penetrates the side of the installation chamber 187 and communicates with the collection box 188, while the other end of the connecting pipe 1810 communicates with the side of the absorption chamber 1811. The absorption chamber 1811 is located on the top surface of the fixing frame 181.

[0045] The working principle of this invention is as follows: The motor 4 located on one side of the mounting base 2 drives the connecting rod 5 to rotate. Using the thread, the connecting seat 6 installed inside the mounting base 2 moves towards each other under the rotation of the connecting rod 5 to adjust the distance between the two sets of lower clamping plates 8 and upper clamping plates 12 to adapt to the length specifications of the steel pipe. Then, the steel pipe to be processed is placed on the surface of the lower clamping plate 8. The electric push rod 10 located on the top surface of the lower connecting plate 9 retracts and drives the upper connecting plate 11 and the upper clamping plate 12 to move down, so that the surface of the upper clamping plate 12 is in contact with the surface of the steel pipe, thus completing the rapid fixation of the steel pipe.

[0046] When the steel pipe is placed above the lower clamping plate 8, the surface of the steel pipe is in contact with the surface of the rotating roller 175. When the upper clamping plate 12 moves down to tighten the steel pipe, the rotating roller 175 is under force and can deflect around the connecting shaft 172, so that the distance between the two rotating rollers 175 is adjusted to adapt to the fixed position of the steel pipe. When the steel pipe is loosened, the rotating roller 175 resets and moves under the elastic action of the spring 1711 to lift the steel pipe as a whole. At this time, the electric push rod 14 set in the mounting column 7 extends and drives the connecting seat 15 to move upward, so that the abutment wheel 16 is in contact with the bottom of the side end of the steel pipe to provide auxiliary support for the steel pipe. The motor 177 set thereafter drives the rotating roller 175 to rotate to adjust the rotation of the steel pipe.

[0047] The baffle 186 installed above the slide groove of the mounting base 2 can block the debris during the processing. When the mounting column 7 moves horizontally, it can push the baffle 186 to move synchronously and push the blocked debris to the opening of the absorption chamber 1811. At this time, the fan 189 is installed and uses the wind power it generates to absorb the debris through the absorption chamber 1811. The debris enters the collection box 188 through the connecting pipe 1810 for temporary storage, thus completing the unified collection of debris.

[0048] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0049] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0050] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-precision energy-saving two-roll skew-rolling piercer unit, characterized in that, Comprising Base (1); Mounting seat (2), fixedly installed on the tabletop of base (1); Supporting plate (3), fixedly connected to one side of mounting seat (2) in length direction, one side of supporting plate (3) relative to mounting seat (2) is provided with motor one (4), the driving shaft of motor one (4) is fixedly connected with connecting rod (5), the surface of connecting rod (5) is rotatably connected with the inner wall of mounting seat (2), and part of the surface of connecting rod (5) is provided with threads; Connecting seat one (6), the inner wall of connecting seat one (6) is threadedly connected with the surface of connecting rod (5), the side edge of connecting seat one (6) is fitted with the inner wall of mounting seat (2), the top surface of connecting seat one (6) is fixedly installed with mounting column (7), the top of mounting column (7) is provided with lower clamping plate (8), the left side and the right side of lower clamping plate (8) are provided with lower connecting plate (9) in opposite, the top surface of lower connecting plate (9) is fixedly installed with electric push rod one (10), the top end of electric push rod one (10) is fixedly connected with upper connecting plate (11), the side edge of upper connecting plate (11) is fixedly connected with upper clamping plate (12).

2. The high-precision energy-saving two-roll cross-piercer set according to claim 1, characterized in that: It also includes a pad (13), which is provided on the surface of the lower clamping plate (8) and the upper clamping plate (12).

3. The high-precision energy-saving two-roll cross-piercer set according to claim 1, characterized in that: It also includes electric push rod two (14), connecting seat two (15) and abutting wheel (16), electric push rod two (14) is fixedly installed in the inside of mounting column (7), the bottom surface of connecting seat two (15) is fixedly connected with the top end of electric push rod two (14), and abutting wheel (16) is rotatably installed on the top of connecting seat two (15).

4. The high-precision energy-saving two-roll cross-piercer set according to claim 1, characterized in that: It also includes a rotating assembly (17), which is provided on the top surface of mounting seat (2).

5. The high-precision energy-saving two-roll cross-piercer set according to claim 4, characterized in that: The rotating assembly (17) includes a support table (171), a connecting shaft (172), an installation plate one (173), a fixed ring (174), a rotating roller (175), a bottom plate (176) and a motor two (177), the support table (171) is fixedly installed on the top surface of mounting seat (2), the surface of connecting shaft (172) is provided with a rough structure, and the connecting shaft (172) is rotatably installed on the surface of support table (171), the bottom end of installation plate one (173) is fixedly connected with the surface of connecting shaft (172), the fixed ring (174) is fixedly installed on the top end of installation plate one (173), one side of rotating roller (175) in length direction is rotatably connected with the inner ring of fixed ring (174), the bottom plate (176) is fixedly installed on one side of fixed ring (174), the motor two (177) is provided on the top surface of bottom plate (176), and the driving shaft of motor two (177) is fixedly connected with one end of rotating roller (175).

6. The high-precision energy-saving two-roll cross-piercer set according to claim 4, characterized in that: It also includes a receiving groove (178), which is formed on both sides of the surface of support table (171).

7. The high-precision energy-saving two-roll cross-piercer set according to claim 4, characterized in that: It further includes a fixing seat (179), a mounting plate two (1710), a spring (1711), a fixing plate (1712), a mounting shaft (1713), the fixing seat (179) is fixedly installed on the top surface of the support table (171), the mounting plate two (1710) is slidingly installed on the side of the fixing seat (179), one end of the spring (1711) is fixedly connected with the surface of the mounting plate two (1710), the other end of the spring (1711) is fixedly connected with the surface of the fixing plate (1712), the mounting shaft (1713) is fixedly installed on the side of the fixing plate (1712), and one end of the mounting shaft (1713) is rotatably connected with the surface of the mounting plate one (173) relative to the fixing plate (1712).

8. The high-precision energy-saving two-roll cross-piercer set according to claim 1, characterized in that: It further includes a chip collecting assembly (18), which is arranged on the top of the mounting seat (2).

9. The high-precision energy-saving two-roll cross-piercer set according to claim 8, characterized in that: The chip collecting assembly (18) includes a fixing frame (181), a side plate (182), a fixing column (183), a guide rod (184), a connecting block (185), and a baffle (186), the fixing frame (181) is fixedly installed on the surface of the support table (171), the side plates (182) are oppositely arranged on the two sides of the fixing frame (181) in the width direction, one end of the fixing column (183) is fixedly connected with the surface of the side plate (182), the guide rod (184) is movably installed in the fixing column (183), one end of the guide rod (184) is fixedly connected with the surface of the connecting block (185), the baffle (186) is slidingly installed in the fixing frame (181), one side of the baffle (186) is fitted with the inside of the containing groove (178), the other side of the baffle (186) is fixedly connected with the surface of the mounting column (7), the connecting blocks (185) are fixedly installed on the left side and the right side of the baffle (186), and the surface of the connecting block (185) is fixedly connected with one end of the guide rod (184) relative to the fixing column (183).

10. The high-precision energy-saving two-roll cross-piercer set according to claim 8, characterized in that: It further includes a mounting bin (187), a collection box (188), a fan (189), a communication pipe (1810), and an absorption cavity (1811), the mounting bin (187) is fixedly installed on the side of the support table (171), the collection box (188) is detachably installed in the mounting bin (187), the top of the collection box (188) is open, the fan (189) is fixedly installed on the top of the mounting bin (187), the port of the fan (189) penetrates through the top surface of the mounting bin (187) and is in communication with the collection box (188), one end of the communication pipe (1810) penetrates through the side of the mounting bin (187) and is in communication with the collection box (188), the other end of the communication pipe (1810) is in communication with the side of the absorption cavity (1811), and the absorption cavity (1811) is arranged on the top surface of the fixing frame (181).

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