A peristaltic pump suitable for optical crystal production

Abstract

The present application relates to the field of peristaltic pump equipment, especially to a peristaltic pump suitable for optical crystal production, comprising a pump body, a top cover is installed on the top of the pump body, a mounting groove is arranged on the inner side of the top end of the top cover, a fixed ring bin is installed inside the mounting groove, a discharge port and a feeding port are installed on one side of the outer periphery of the fixed ring bin, a ring frame is rotatably connected to the inner side of the fixed ring bin, a fixed hose is installed in the middle of the ring frame, a driving gear is engagedly connected to the upper and lower parts of one side of the ring frame, the driving gears are half gears comprising a toothless section and a toothed section, the toothless section of the driving gear corresponds to an eccentric protruding part, the present application can drive the ring frame to rotate synchronously when the driving gear rotates, and the ring frame is deflected by an angle, so that the squeezed part just contacted with the compression wheel is moved away, the compression wheel will contact the new part of the fixed hose next time, and the compression wheel and the fixed hose are prevented from being in contact with each other for a long time.

Description

Technical Field

[0001] This invention relates to the field of peristaltic pump equipment, and more particularly to a peristaltic pump suitable for optical crystal production. Background Technology

[0002] Peristaltic pumps, due to their characteristics of conveying contaminants without pollution and easily adjustable flow rates, have become core equipment in high-precision applications. However, traditional peristaltic pumps still have many technical pain points in practical applications. Traditional peristaltic pumps mostly use ordinary soft rubber tubing as the conveying channel, lacking effective limiting and support structures. In high-frequency extrusion operations, problems such as tubing swaying and deformation stretching can easily occur, resulting in large fluctuations in material output. The pressure roller extrusion degree adjustment of existing peristaltic pumps is mostly adjusted manually by machinery, which is cumbersome to operate and has limited adjustment accuracy. It cannot quickly adapt to the different requirements of material output for different processes, and process switching requires a lot of time. Debugging increases production costs and efficiency losses. On the one hand, the pressure roller repeatedly squeezes the same area of ​​the guide tube for a long time, leading to local wear and fatigue cracking of the guide tube, requiring frequent replacement of the guide tube, which not only increases the cost of consumables but also causes production interruptions. On the other hand, the pressure roller and the guide tube generate a lot of heat during high-frequency friction. The heat accumulation cannot be dissipated in time, which will accelerate the aging and hardening of the guide tube, further shortening its service life. At the same time, it will also aggravate the wear of the pressure roller, reduce the overall operational stability of the equipment, and pose risks of backflow and channel collapse. Therefore, we propose a peristaltic pump suitable for optical crystal production to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing a peristaltic pump suitable for optical crystal production.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a peristaltic pump suitable for optical crystal production, comprising a pump body, a top cover mounted on the top of the pump body, an installation groove provided on the inner side of the top of the top cover, a fixed ring chamber installed inside the installation groove, a discharge port and a feed port installed on one side of the outer circumference of the fixed ring chamber, a ring frame rotatably connected to the inner side of the fixed ring chamber, a fixed hose installed in the middle of the ring frame, and a drive gear meshing with both the upper and lower parts of one side of the ring frame, wherein the drive gears are all half gears including toothless and toothed sections, and the drive gears... The toothless section corresponds to the eccentric protrusion of the pressure roller. A rotating column is fixedly connected to the middle of each of the driving gears. A pressure roller is provided on the outer side of the rotating column. The pressure roller is located between the driving gears. A slide bar is fixedly connected to the middle of the inner side of the pressure roller. A sliding groove is opened in the middle of the rotating column. A slide bar is slidably connected to the inner side of the sliding groove. A tooth groove is opened in the middle of the middle of the top of the rotating column. A stepper motor is installed at the middle of the top of the rotating column. A rotating shaft is fixedly connected to the bottom drive end of the stepper motor. A tooth column is fixedly connected to the bottom of the rotating shaft. The tooth column is meshed with the inner side of the tooth groove.

[0005] Preferably, a storage device is connected to the end of the inlet, and a spray head is connected to the end of the outlet. The ends of both the outlet and the inlet that are away from the fixed ring hopper penetrate the side wall of the top cover.

[0006] Preferably, a servo motor is installed inside the pump body, and a drive shaft is fixedly connected to the top drive end of the servo motor. The top of the drive shaft is installed inside the bottom end of the rotating column.

[0007] Preferably, a limiting ring is fixedly connected to the outer side of the bottom of the ring frame, and the limiting ring is rotatably connected to the top of the fixed ring compartment.

[0008] Preferably, an internal block is installed on one side of the fixed ring chamber, the internal block is slidably connected to the ring frame and the fixed hose, and an external retainer is slidably connected to the side of the fixed hose away from the internal block, the external retainer being installed inside the mounting groove.

[0009] Preferably, the built-in block is disposed between the discharge port and the inlet port, and a one-way valve is installed inside both the discharge port and the inlet port.

[0010] Preferably, the driven gears are meshed with each other on the outer periphery of the driving gear away from the ring frame, and each driven gear is fixedly connected to a rotating shaft in the middle.

[0011] Preferably, all the rotating shafts are rotatably connected to the top cover, and uniformly distributed fan blades are fixedly connected to the middle of the outer periphery of the rotating shaft.

[0012] Preferably, an end cap is installed on the top of the top cover, and a grille is installed in the middle of the end cap.

[0013] Preferably, a pressure ring is fixedly connected to the outer side of the bottom of the end cap, and the bottom of the pressure ring is in contact with the edge of the ring frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] To address the issue of fluctuating output caused by ordinary soft tubing in existing peristaltic pumps due to tubing swaying, deformation, and stretching, this invention replaces the traditional tubing with a fixed flexible tube. Furthermore, a fixed ring chamber and a limiting ring provide dual restraint for both the ring frame and the fixed flexible tube. Combined with the support of an internal block and an external retainer, this effectively prevents tubing displacement and irreversible deformation during operation, ensuring stable and controllable output. This significantly improves the accuracy and consistency of pumping operations, making it more suitable for high-precision applications.

[0016] To address the issues of inconvenient output adjustment and insufficient precision in traditional peristaltic pump devices, which make it difficult to meet the differentiated requirements of various application scenarios, this invention uses a stepper motor to drive a toothed column and toothed groove meshing transmission, which drives the slide bar to slide along the slide groove, thereby achieving flexible adjustment of the pressure roller eccentricity, accurately changing the degree of compression of the pressure roller on the fixed hose, and ultimately achieving precise control of the single output. It is easy to operate and has a wide adjustment range, which can quickly adapt to the working needs of different working scenarios and reduce process switching costs.

[0017] To address the problem that existing peristaltic pumps generate a large amount of heat during long-term operation due to continuous friction between the pressure roller and the fixed hose, which accelerates the aging and hardening of the fixed hose and shortens its service life, this invention uses the meshing transmission of the driving gear and driven gear to drive the rotating shaft and fan blades to rotate synchronously, forming a directional airflow that can remove the heat generated by the friction between the pressure roller and the fixed hose in real time. Moreover, the fan blade rotation speed is synchronized with the pressure roller rotation speed to achieve "on-demand heat dissipation," effectively slowing down the aging rate of the fixed hose, reducing pressure roller wear, reducing the frequency of peristaltic pump maintenance and component replacement costs, and improving the overall operational stability and service life of the peristaltic pump.

[0018] To address the problem of traditional peristaltic pumps where the pressure roller constantly presses against the same area of ​​the fixed hose, leading to localized wear, fatigue cracking, frequent hose replacements, and increased operating costs and downtime, this invention employs a half-gear structure with a drive gear. After the pressure roller completes its pressing action and disengages from the fixed hose, the toothed section of the drive gear meshes with the ring frame, causing the ring frame and the fixed hose to rotate synchronously. This ensures that the pressure roller always contacts a new area of ​​the fixed hose during the next pressing action, completely avoiding the problem of localized long-term wear on the fixed hose. This design significantly extends the service life of the fixed hose, reduces the frequency of replacing vulnerable parts, and lowers the risk of production interruptions and operating costs.

[0019] To address the issues of low efficiency and poor continuity of operation in some existing peristaltic pumps due to poor sealing of the working channel and fluid backflow, this invention divides the interior of the fixed ring chamber into a one-way channel by an internal block. Combined with the one-way valves built into the discharge and inlet ports, a closed-loop anti-backflow structure is formed for "feeding, working, and discharging," effectively avoiding backflow and leakage problems and ensuring the continuity and stability of the working process. At the same time, the internal block provides internal support for the fixed hose, further preventing the fixed hose from collapsing due to frequent compression and ensuring that the working channel is always unobstructed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the formal three-dimensional structure of a peristaltic pump suitable for optical crystal production according to the present invention;

[0021] Figure 2 This is a partial structural diagram of the end cap of a peristaltic pump suitable for optical crystal production according to the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the top cover of a peristaltic pump suitable for optical crystal production according to the present invention;

[0023] Figure 4 This is a partial structural diagram of the drive shaft of a peristaltic pump suitable for optical crystal production according to the present invention;

[0024] Figure 5 This is a partial structural diagram of the built-in block of a peristaltic pump suitable for optical crystal production according to the present invention;

[0025] Figure 6 This is a partial structural diagram of the fan blade and pressure roller of a peristaltic pump suitable for optical crystal production according to the present invention;

[0026] Figure 7 This is a partial structural diagram of the tooth column and tooth groove of a peristaltic pump suitable for optical crystal production according to the present invention.

[0027] 101. Pump body; 102. Top cover; 103. Discharge port; 104. Inlet port; 105. End cover; 106. Pressure ring; 107. Ring frame; 108. Driven gear; 109. Fixed hose; 110. Drive gear; 111. Stepper motor; 112. Pressure roller; 113. Fixed ring chamber; 114. Drive shaft; 115. Rotating column; 116. Internal block; 117. Fan blade; 118. Rotating shaft; 119. Gear groove; 120. Sliding bar; 121. Gear column; 122. Grille; 123. Slide groove; 124. Mounting groove; 125. Rotating shaft; 126. Limit ring. Detailed Implementation

[0028] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0029] like Figures 1-7The peristaltic pump shown is suitable for optical crystal production. It includes a pump body 101, a top cover 102 installed on the top of the pump body 101, an installation groove 124 provided on the inner side of the top of the top of the top cover 102, a fixed ring chamber 113 installed inside the installation groove 124, an outlet 103 and an inlet 104 installed on one side of the outer circumference of the fixed ring chamber 113, a storage device connected to the end of the inlet 104, a spray head connected to the end of the outlet 103, and the ends of the outlet 103 and the inlet 104 away from the fixed ring chamber 113 both penetrate through the side wall of the top cover 102. A ring frame 107 is rotatably connected to the inner side of the fixed ring chamber 113, a fixed hose 109 is installed in the middle of the ring frame 107, a servo motor is installed inside the pump body 101, a drive shaft 114 is fixedly connected to the top drive end of the servo motor, and the top of the drive shaft 114 is installed inside the bottom end of the rotating column 115.

[0030] Furthermore, in specific implementation, during operation, the servo motor inside the pump body 101 can be activated. The servo motor drives the drive shaft 114 to rotate, which in turn drives the rotating column 115 to rotate. The rotating column 115, through the slide bar 120, drives the pressure roller 112 to rotate synchronously. When the pressure roller 112 rotates, it squeezes the fixed hose 109 on one side, thereby squeezing the material inside the fixed hose 109 from one side to the other. This allows the material to be extracted from the storage device through the feed port 104 and discharged from the discharge port 103, achieving the output of the material through the spray head. By replacing the traditional soft rubber conduit with the fixed hose 109, during operation, the fixed ring chamber 113 and the limiting ring 126 can limit the ring frame 107 and the fixed hose 109, thereby avoiding the conduit shaking or deformation and stretching that easily occur during operation with traditional soft rubber conduits. The output volume is beneficial for practical use. Furthermore, during the conveying process, the drive gear 110 rotates. When the toothless section of the drive gear 110 is rotated to near the inner edge of the ring frame 107, the pressure roller 112 squeezes the fixed hose 109 to complete the conveying work. After the pressure roller 112 disengages from the fixed hose 109, the toothed section of the drive gear 110 rotates to contact the inner edge of the ring frame 107. Through the meshing of the two, the drive gear 110 can drive the ring frame 107 and the fixed hose 109 to rotate synchronously and deflect at an angle. This allows the squeezed part that was in contact with the pressure roller 112 to be removed, so that the pressure roller 112 will contact a new part of the fixed hose 109 the next time it squeezes. This avoids the pressure roller 112 and a certain part of the fixed hose 109 being in contact with each other for a long time, thus greatly improving the service life of the fixed hose 109.

[0031] Among them, the upper and lower parts of one side of the ring frame 107 are meshed with drive gears 110. The drive gears 110 are all half gears including toothless and toothed sections. The toothless section of the drive gear 110 corresponds to the eccentric protrusion of the pressure roller 112. The middle of the drive gear 110 is fixedly connected to a rotating column 115. The outer side of the rotating column 115 is provided with a pressure roller 112. The pressure roller 112 is located between the drive gears 110. The middle of the inner side of the pressure roller 112 is fixedly connected to a slide bar 120. The middle of the rotating column 115 is provided with a slide groove 123. The slide bar 120 is slidably connected to the inner side of the slide groove 123. The middle of the slide bar 120 is provided with a tooth groove 119. The middle of the top of the rotating column 115 is equipped with a stepper motor 111. The bottom drive end of the stepper motor 111 is fixedly connected to a rotating shaft 125. The bottom of the rotating shaft 125 is fixedly connected to a toothed column 121. The toothed column 121 is meshed with the inner side of the tooth groove 119.

[0032] Furthermore, in practical implementation, the stepper motor 111 can be activated according to work requirements. The operation of the stepper motor 111 can drive the rotating shaft 125 to rotate, which in turn drives the fixed toothed column 121 at the bottom to rotate synchronously. When the toothed column 121 rotates, it will drive the slide bar 120 to move through the meshing tooth groove 119, which in turn drives the pressure roller 112 to move, thereby adjusting the eccentricity of the pressure roller 112. This changes the pressure of the pressure roller 112 on the fixed hose 109 when it rotates, thus enabling the adjustment of the single output, facilitating precise control and benefiting practical work.

[0033] Among them, a limiting ring 126 is fixedly connected to the outer bottom of the ring frame 107. The limiting ring 126 is rotatably connected to the top of the fixed ring chamber 113. An internal block 116 is installed on one side of the fixed ring chamber 113. The internal block 116 is slidably connected to the ring frame 107 and the fixed hose 109. An external retainer is slidably connected to the side of the fixed hose 109 away from the internal block 116. The external retainer is installed inside the mounting groove 124. The internal block 116 is located between the discharge port 103 and the inlet port 104. A one-way valve is installed inside both the discharge port 103 and the inlet port 104.

[0034] Furthermore, in specific implementation, during operation, the built-in block 116 inside the fixed ring chamber 113 can separate the fixed hose 109 from the internal space of the fixed ring chamber 113, so that the feed inlet 104, the fixed ring chamber 113 and the discharge outlet 103 can form a one-way channel. With the cooperation of the one-way valves inside the discharge outlet 103 and the feed inlet 104, the stability of the conveying operation can be ensured, which is beneficial to practical use. At the same time, the built-in block 116 can support the fixed hose 109 from the inside, and with the cooperation of the external retainer, the shape of the fixed hose 109 can be maintained, avoiding irreversible deformation of the fixed hose 109 due to repeated compression in a short period of time, which would affect the subsequent output control.

[0035] Among them, the driven gears 108 are meshed on the side of the outer periphery of the driving gear 110 away from the ring frame 107. The driven gears 108 are fixedly connected to the middle of the shaft 118. The shaft 118 is rotatably connected to the top cover 102. The evenly distributed fan blades 117 are fixedly connected to the middle of the outer periphery of the shaft 118. The top cover 102 is equipped with an end cover 105. The end cover 105 is equipped with a grid 122 in the middle. The bottom outer side of the end cover 105 is fixedly connected with a pressure ring 106. The bottom of the pressure ring 106 is in contact with the edge of the ring frame 107.

[0036] Furthermore, in specific implementation, the driving gear 110 can drive the driven gear 108 meshing on one side to rotate synchronously. The driven gear 108 can drive the rotating shaft 118 fixed thereto to rotate. When the rotating shaft 118 rotates, the fan blades 117 fixed on the outer periphery of the rotating shaft 118 can disturb the surrounding air and form an airflow. When the air flows, it will carry away the heat generated by the friction between the pressure roller 112 and the fixed hose 109, realizing synchronous heat dissipation of the fixed hose 109 and the pressure roller 112. The rotation speed of the rotating shaft 118 and the fan blades 117 changes synchronously with the rotation speed of the rotating column 115 and the pressure roller 112 to achieve adaptive heat dissipation, thereby effectively slowing down the aging rate of the fixed hose 109, which is beneficial to practical use.

[0037] Working principle:

[0038] In actual operation, the servo motor inside the pump body 101 can be activated, which drives the drive shaft 114 to rotate. The drive shaft 114 drives the rotating column 115 to rotate, and the rotating column 115 drives the pressure roller 112 to rotate synchronously via the slide bar 120. When the pressure roller 112 rotates, it squeezes the fixed hose 109 on one side, thereby squeezing the material inside the fixed hose 109 from one side to the other. This allows the material to be extracted from the storage device through the feed port 104 and discharged from the discharge port 103, achieving the output of the material through the spray head. By replacing the traditional soft rubber conduit with the fixed hose 109, during operation, the fixed ring chamber 113 and the limiting ring 12... 6. This design enables the limiting of the ring frame 107 and the fixed hose 109, thus avoiding the problems of hose swaying or deformation and stretching that easily affect the output during the operation of traditional soft hoses. This is beneficial for practical use. In actual use, the stepper motor 111 can be started according to the work requirements. The operation of the stepper motor 111 drives the rotating shaft 125 to rotate. The rotating shaft 125 drives the bottom fixed toothed column 121 to rotate synchronously. When the toothed column 121 rotates, it drives the slide bar 120 to move through the meshing tooth groove 119, which in turn drives the pressure roller 112 to move. This allows for the adjustment of the eccentricity of the pressure roller 112, thereby changing the pressure of the pressure roller 112 on the fixed hose 109 when it rotates. This allows for adjustment of the single output, facilitating precise control and benefiting practical work. During this process, the driving gear 110 drives the driven gear 108 meshing on one side to rotate synchronously. The driven gear 108 then drives the fixed shaft 118 to rotate. When the shaft 118 rotates, the fan blades 117 fixed to its outer periphery disturb the surrounding air, creating airflow. This airflow carries away the heat generated by the friction between the pressure roller 112 and the fixed hose 109, achieving synchronous heat dissipation for both the fixed hose 109 and the pressure roller 112. The rotational speeds of the shaft 118 and fan blades 117 change synchronously with the rotational speeds of the rotating column 115 and the pressure roller 112, achieving adaptive heat dissipation. The hot operation effectively slows down the aging rate of the fixed hose 109, which is beneficial for practical use. Furthermore, during the conveying process, the drive gear 110 rotates. When the toothless section of the drive gear 110 is close to the inner edge of the ring frame 107, the pressure roller 112 squeezes the fixed hose 109 to complete the conveying process. After the pressure roller 112 disengages from the fixed hose 109, the toothed section of the drive gear 110 rotates to contact the inner edge of the ring frame 107. Through their meshing, the drive gear 110 rotates, causing the ring frame 107 and the fixed hose 109 to rotate synchronously, deflecting at an angle. This removes the squeezed area that was in contact with the pressure roller 112.This design ensures that the pressure roller 112 contacts a new part of the fixed hose 109 during the next compression, preventing prolonged contact and stress between a single part of the pressure roller 112 and the fixed hose 109. This significantly extends the service life of the fixed hose 109. During operation, the built-in block 116 inside the fixed ring chamber 113 separates the fixed hose 109 from the internal space of the fixed ring chamber 113, creating a one-way channel between the inlet 104, the fixed ring chamber 113, and the outlet 103. Combined with the one-way valves inside the outlet 103 and the inlet 104, this ensures stable conveying and is beneficial for practical use. Simultaneously, the built-in block 116 provides internal support for the fixed hose 109, and the external retainer helps maintain its shape, preventing irreversible deformation due to repeated compression in a short period, which could affect subsequent operations.

[0039] The foregoing has shown and described 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 to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A peristaltic pump suitable for use in the production of optical crystals comprising a pump body (101) characterised in that: The pump body (101) top is provided with a top cover (102), the top cover (102) top end inner side is provided with an installation slot (124), the installation slot (124) inside is provided with a fixed ring bin (113), the fixed ring bin (113) outer peripheral one side is provided with a discharge port (103) and a feeding port (104), the fixed ring bin (113) inner side is rotatably connected with a ring frame (107), the ring frame (107) middle part is provided with a fixed hose (109), the ring frame (107) inner side one side upper and lower parts are all connected with a driving gear (110), the driving gear (110) is all half gear including toothless section and toothed section, the driving gear (110) toothless section corresponds with eccentric extension part of a compression wheel (112), the driving gear (110) middle part is all fixedly connected with a rotating column (115), the rotating column (115) outer side is provided with a compression wheel (112), the compression wheel (112) is arranged between the driving gear (110), the compression wheel (112) inner side middle part is fixedly connected with a slide bar (120), the rotating column (115) middle part is provided with a sliding slot (123), the sliding slot (123) inner side is slidably connected with a slide bar (120), the slide bar (120) middle part is provided with a gear slot (119), the rotating column (115) top end middle part is provided with a step motor (111), the step motor (111) bottom drive end is fixedly connected with a rotating shaft (125), the rotating shaft (125) bottom is fixedly connected with a toothed column (121), the toothed column (121) is engagedly connected in the gear slot (119) inner side.

2. A peristaltic pump suitable for use in the production of optical crystals according to claim 1, characterized in that: The feeding port (104) end is connected with a storage device, the discharge port (103) end is connected with a spraying head, the discharge port (103) and the feeding port (104) are away from the fixed ring bin (113) one end and all penetrate the side wall of the top cover (102).

3. A peristaltic pump suitable for use in the production of optical crystals according to claim 1, wherein: The pump body (101) inside is provided with a servo motor, the servo motor top drive end is fixedly connected with a drive shaft (114), the drive shaft (114) top is installed in the rotating column (115) bottom end inside.

4. A peristaltic pump suitable for use in the production of optical crystals according to claim 1, wherein: The ring frame (107) bottom outer side is fixedly connected with a limiting ring (126), the limiting ring (126) is rotatably connected in the fixed ring bin (113) top.

5. A peristaltic pump suitable for use in the production of optical crystals according to claim 4, wherein: The fixed ring bin (113) inner side is provided with an embedded block (116), the embedded block (116) is slidably connected with the ring frame (107) and the fixed hose (109), the fixed hose (109) side away from the embedded block (116) is slidably connected with a matched external retaining frame, the external retaining frame is installed in the installation slot (124) inside.

6. A peristaltic pump suitable for use in the production of optical crystals according to claim 5, wherein: The embedded block (116) is arranged between the discharge port (103) and the feeding port (104), the discharge port (103) and the feeding port (104) inside are all provided with a check valve.

7. A peristaltic pump suitable for use in the production of optical crystals according to claim 6, wherein: The driving gear (110) outer peripheral side away from the ring frame (107) is all engagedly connected with a driven gear (108), the driven gear (108) middle part is all fixedly connected with a rotating shaft (118).

8. A peristaltic pump suitable for use in the production of optical crystals according to claim 7, wherein: The rotating shafts (118) are rotationally connected with the top cover (102), and the outer circumferential middle part of the rotating shaft (118) is fixedly connected with uniformly distributed fan leaves (117).

9. A peristaltic pump suitable for use in the production of optical crystals according to claim 8, wherein: The end cover (105) is installed at the top of the top cover (102), and the middle part of the end cover (105) is installed with a grille (122).

10. A peristaltic pump suitable for use in the production of optical crystals according to claim 9, wherein: The bottom outer side of the end cover (105) is fixedly connected with a compression ring (106), and the bottom of the compression ring (106) is in contact with the edge of a ring frame (107).

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