A batching mixer for a medium borosilicate pharmaceutical glass production line

Abstract

The application discloses a batching and mixing machine for a medium borosilicate medicinal glass production line, and belongs to the field of glass preparation, which comprises a casing, two cylinder bodies are arranged on the upper side of the casing, a feeding pipe is fixedly connected to the lower side of the side wall of the cylinder body and communicates with the casing, a feeding pipe is fixedly connected to the upper side of the side wall of the cylinder body, an electric valve is mounted on the side wall of the feeding pipe, a screening mechanism is arranged in the cylinder body, two guide plates are fixedly connected to the left and right inner walls of the casing and are close to the top surface, a mixing mechanism is arranged on the lower side of the guide plate, an inclined plate is fixedly connected to the inner wall of the casing, a discharging mechanism is arranged on the lower side of the inclined plate, and a pressing mechanism is arranged on the left side of the inner cavity of the casing, which can realize the following effects: in the feeding process, a screening treatment is added, large-particle materials contained in raw materials are removed, the raw materials are uniformly heated, and the glass quality is improved.

Description

Technical Field

[0001] This invention relates to the field of glass preparation, and more specifically, to a batching and mixing machine for a borosilicate pharmaceutical glass production line. Background Technology

[0002] Glass is an inorganic non-metallic material, usually made by mixing and heating various inorganic minerals (quartz sand, borax, barium carbonate, etc.), and then processing them through molding, annealing, and polishing. Currently, in addition to its widespread use in the construction industry, glass is also commonly used in the medical field.

[0003] Among them, the pharmaceutical glass bottles used for borosilicate medicines are the most common glass products. Using neutral borosilicate glass to package medicines has the advantages of good material quality and less impact on the medicine. However, compared with low borosilicate glass, it is of poorer quality, has more glass fragments, and has the phenomenon of tablets sticking together. Therefore, borosilicate glass is now more commonly used.

[0004] Patent search revealed that Chinese patent CN209138453U discloses a batching mixer for a low-silicon borosilicate glass pharmaceutical tube production line. During the preparation process, the iron generated by the friction between the glass raw material and the inner wall of the mixing tank is adsorbed onto the inner wall of the mixing tank under the action of a magnet, which can reduce the iron content mixed in the glass raw material and improve the quality of the product.

[0005] However, since glass production requires the use of various mineral powders, the aforementioned patent only uses stirring and mixing, which cannot screen impurities in the raw materials. The mixing process not only mixes various raw materials evenly, but also removes large particles in the raw materials to ensure that the raw materials are heated evenly. Otherwise, even with the same heating temperature and heating time, the degree of melting of the raw materials after heating will be different due to the different volumes of the raw materials. This can easily lead to the formation of protrusions, bubbles, or granular substances on the surface of the glass after it is formed, affecting the quality of the glass. Therefore, the control of the raw material material is very important. Summary of the Invention

[0006] 1. Technical problems to be solved

[0007] To address the problems existing in the prior art, the purpose of this invention is to provide a batching and mixing machine for a borosilicate pharmaceutical glass production line. This machine can add a screening process during the feeding process to remove large particles from the raw materials, ensuring uniform heating of the raw materials and thus improving the quality of the glass.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A batching and mixing machine for a borosilicate pharmaceutical glass production line includes a housing. Two cylinders are arranged on the upper side of the housing. A feed pipe is fixedly connected to the lower side wall of each cylinder and communicates with the housing. A feeding pipe is fixedly connected to the upper side wall of each cylinder, and an electric valve is installed on the side wall of the feeding pipe. A screening mechanism is arranged inside the cylinder. Two guide plates are fixedly connected to the left and right inner walls of the housing near the top surface. A mixing mechanism is arranged below the guide plates. An inclined plate is fixedly connected to the inner wall of the housing, and a discharge mechanism is arranged below the inclined plate. A pressing mechanism is arranged near the left side of the inner cavity of the housing.

[0011] The upper side of the inclined plate is a storage cavity, and the gap between the inclined plate and the machine casing is a discharge cavity.

[0012] In some embodiments, the screening mechanism includes a screening cylinder located within the inner cavity of the cylinder. A first push rod is fixedly connected to the end face of the cylinder. The output end of the first push rod passes through the cylinder and is rotatably connected to the end face of the screening cylinder. A cylindrical cylinder is fixedly connected to the inner end face of the screening cylinder. A round rod is slidably connected inside the cylindrical cylinder. The other end of the round rod passes through the cylinder and is rotatably connected to it. A first motor is fixedly installed on the other end face of the cylinder. The output end of the first motor is fixedly connected to the round rod.

[0013] The feeding pipe penetrates the cylinder and is L-shaped. An impurity pipe is fixedly connected to the lower side wall of the cylinder.

[0014] In some embodiments, the mixing mechanism includes two circular shafts rotatably connected to the left and right inner walls of the housing. Several uniformly distributed mixing plates are fixedly connected to the side walls of the circular shafts. The mixing plates are all L-shaped. At least four circular holes are opened on the side walls of the mixing plates. A cam is fixedly connected to the front side wall of the circular shaft near the left side.

[0015] The right end of the circular shaft passes through the housing and is fixedly connected to a grooved wheel, and a belt is used to drive the two grooved wheels together.

[0016] In some embodiments, the discharge mechanism includes a drive shaft and a spiral conveying blade. The drive shaft is rotatably connected to the inner wall of the housing near the bottom surface. The spiral conveying blade is fixedly connected to the side wall of the drive shaft. A discharge nozzle is fixedly connected to the right side wall of the housing near the bottom surface. A transmission assembly is provided on the left side wall of the housing.

[0017] In some embodiments, the transmission assembly includes a housing, which is fixedly connected to the left side wall of the housing. A second motor is fixedly installed on the left side wall of the housing. The left end of the transmission shaft passes through the housing and is fixedly connected to the output shaft of the second motor. A sprocket is fixedly connected to the side wall of the transmission shaft and the left end of the front round shaft, respectively. A chain is driven between the two sprockets.

[0018] In some embodiments, the pressing mechanism includes a protective cover, which is fixedly connected to the inner wall of the left side of the housing. A movable plate is provided on the upper side of the protective cover. The bottom surface of the movable plate penetrates the protective cover and is movably connected to it. A spring is sleeved on the inner wall of the protective cover. A pressure plate is fixedly connected to the bottom surface of the movable plate. A control component is provided on the side wall of the movable plate.

[0019] In some embodiments, the control component includes an insert plate located on the left side of a movable plate. The insert plate passes through the housing and is movably connected thereto. A through hole is provided on the top surface of the insert plate, and a through groove corresponding to the insert plate is provided on the side wall of the movable plate. A second push rod is fixedly connected to the top surface of the inner cavity of the protective cover. The output end of the second push rod passes through the protective cover and is fixedly connected to a trapezoidal block. The trapezoidal block matches the through hole.

[0020] In some embodiments, the top surface of the movable plate is rotatably connected to a movable wheel.

[0021] In some embodiments, two limiting blocks are symmetrically fixedly connected to the side wall of the cylindrical rod near the end face, and two limiting grooves are symmetrically opened on the inner wall of the cylinder, with the limiting blocks and limiting grooves being slidably connected.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of this invention are:

[0024] (1) This technical solution uses the cooperation between the casing, cylinder, feeding pipe and screening mechanism to add raw material powder into the screening cylinder through the feeding pipe. The centrifugal force generated by the rotation of the screening cylinder is used to throw the powder or granular material into the feeding pipe for feeding. A screening process is added before mixing. After screening, the unqualified raw materials remaining in the screening cylinder are thrown out by the inertia generated by the displacement of the screening cylinder by the first push rod, thereby improving the screening effect.

[0025] (2) This technical solution uses the cooperation between the casing, inclined plate, pressing mechanism and discharge mechanism, etc. After the screened raw material is mixed by the mixing mechanism, it is collected in the storage cavity. When the raw material needs to be discharged, the pressing plate can press the raw material in the storage cavity into the gap between the screw conveyor blades, increase the discharge speed of the raw material, and at the same time play a guiding role, reducing the probability of raw material agglomeration. When the discharge stops, the pressing plate can stay in the gap between the inclined plate and the casing to block the raw material in the storage cavity. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the screening mechanism in this invention;

[0029] Figure 4 This is a schematic diagram of the Chinese hybrid mechanism of the present invention;

[0030] Figure 5 For the present invention Figure 2 Enlarged view of point A in the image;

[0031] Figure 6 For the present invention Figure 2 Enlarged view of point B in the image;

[0032] Figure 7 For the present invention Figure 3 Enlarged view of point C in the image.

[0033] Explanation of the labels in the diagram:

[0034] 1. Casing; 2. Cylinder; 3. Feeding pipe; 4. Screening cylinder; 5. First push rod; 6. Cylinder; 7. Round rod; 8. First motor; 9. Feed pipe; 10. Impurity pipe; 11. Guide plate; 12. Round shaft; 13. Mixing plate; 14. Inclined plate; 15. Drive shaft; 16. Screw conveyor blade; 17. Discharge nozzle; 18. Shell; 19. Second motor; 20. Sprocket; 21. Chain; 22. Grooved wheel; 23. Belt; 24. Cam; 25. Movable plate; 26. Protective cover; 27. Spring; 28. Pressure plate; 29. ​​Insert plate; 30. Through hole; 31. Through groove; 32. Second push rod; 33. Trapezoidal block; 34. Limiting block; 35. Limiting groove; 36. Electric valve; 37. Movable wheel. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] Example 1:

[0037] Please see Figure 1-7A batching and mixing machine for a borosilicate pharmaceutical glass production line includes a casing 1. Two cylinders 2 are mounted on the upper side of the casing 1. A feed pipe 9 is fixedly connected to the lower side wall of each cylinder 2, communicating with the casing 1. A feeding pipe 3 is fixedly connected to the upper side wall of each cylinder 2. An electric valve 36 is installed on the side wall of the feeding pipe 3. The electric valve 36 enables automatic material control, improving batching accuracy and reducing material mixing errors. A screening mechanism is installed inside each cylinder 2. The left and right inner walls of the casing 1 are close to... Two guide plates 11 are fixedly connected to the top surface. The guide plates 11 can guide the falling material so that the material can fall onto the mixing plate 13 to disperse and mix the various materials. The material can also achieve the mixing effect during the falling process. A mixing mechanism is provided on the lower side of the guide plate 11. An inclined plate 14 is fixedly connected to the inner wall of the machine housing 1. The inclined plate 14 can facilitate the falling material to be concentrated in the discharge chamber. A discharge mechanism is provided on the lower side of the inclined plate 14. A pressing mechanism is provided on the left side of the inner cavity of the machine housing 1.

[0038] The upper side of the inclined plate 14 is the material storage chamber, and the gap between the inclined plate 14 and the machine casing 1 is the material discharge chamber.

[0039] See Figure 2 and Figure 3 In some embodiments, the screening mechanism includes a screening cylinder 4 located inside the cylinder 2. A first push rod 5 is fixedly connected to the end face of the cylinder 2. The output end of the first push rod 5 passes through the cylinder 2 and is rotatably connected to the end face of the screening cylinder 4. A cylinder 6 is fixedly connected to the inner end face of the screening cylinder 4. A round rod 7 is slidably connected inside the cylinder 6. Two limiting blocks 34 are symmetrically fixedly connected to the side wall of the round rod 7 near the end face. Two limiting grooves 35 are symmetrically opened on the inner wall of the cylinder 6. The limiting blocks 34 are slidably connected to the limiting grooves 35. The driving force of the first motor 8 can be transmitted to the screening cylinder 4 by the cylinder 6 and the round rod 7, causing the screening cylinder 4 to rotate. The other end of the round rod 7 passes through the cylinder 2 and is rotatably connected to it. The first motor 8 is fixedly installed on the other end face of the cylinder 2. The output end of the first motor 8 is fixedly connected to the round rod 7. The centrifugal force generated by the rotation of the screening cylinder 4 is used to screen out the raw material and enter the machine casing 1 through the feed pipe 9. At the same time, large particles can be easily discharged.

[0040] The feeding pipe 3 penetrates the cylinder 2 and is L-shaped. The impurity pipe 10 is fixedly connected to the lower side wall of the cylinder 2.

[0041] Through the cooperation between the casing 1, cylinder 2, feeding pipe 3 and screening mechanism, the raw material powder is added to the screening cylinder 4 by the feeding pipe 3. The centrifugal force generated by the rotation of the screening cylinder 4 throws the powder or granular material into the feeding pipe 9 for feeding. An additional screening process is added before mixing. After screening, the unqualified raw materials remaining in the screening cylinder 4 are thrown out by the inertia generated by the displacement of the screening cylinder 4 by the first push rod 5, thereby improving its screening effect.

[0042] See Figure 2 and Figure 4 In some embodiments, the mixing mechanism includes two round shafts 12, which are rotatably connected to the left and right inner walls of the housing 1. Several uniformly distributed mixing plates 13 are fixedly connected to the side walls of the round shafts 12. The mixing plates 13 are all L-shaped and have at least four round holes on their side walls. A cam 24 is fixedly connected to the side wall of the front round shaft 12 near the left side. By setting the mixing plates 13, when the raw material falls, the raw material can be dispersed by rotating the multiple mixing plates 13. The airflow generated during the rotation can also promote the uniformity of the mixing of the raw material. The mixing plates 13 on both sides are staggered. When the material falls, after being dispersed by the mixing plates 13 on both sides, part of the material falls from the outside of the mixing plates 13, and the other part of the material falls from the gap between the mixing plates 13.

[0043] The right end of the round shaft 12 passes through the housing 1 and is fixedly connected to a grooved wheel 22. A belt 23 is connected between the two grooved wheels 22 for transmission.

[0044] See Figure 1 In some embodiments, the discharge mechanism includes a drive shaft 15 and a spiral conveyor blade 16. The drive shaft 15 is rotatably connected to the inner wall of the housing 1 near the bottom surface. The spiral conveyor blade 16 is fixedly connected to the side wall of the drive shaft 15. A discharge nozzle 17 is fixedly connected to the right side wall of the housing 1 near the bottom surface. A transmission assembly is provided on the left side wall of the housing 1, which can stably discharge the raw materials and reduce material residue. At the same time, the spiral conveyor blade 16 contacts the inner wall of the housing 1, which can prevent problems such as material adhesion and agglomeration.

[0045] See Figure 2 and Figure 5 In some embodiments, the transmission assembly includes a housing 18, which is fixedly connected to the left side wall of the housing 1. A second motor 19 is fixedly installed on the left side wall of the housing 18. The left end of the transmission shaft 15 passes through the housing 1 and is fixedly connected to the output shaft of the second motor 19. A sprocket 20 is fixedly connected to the left end of the front round shaft 12 on the side wall of the transmission shaft 15. A chain 21 is connected between the two sprockets 20. By setting the transmission assembly, the driving force of the second motor 19 can be linked to control the mixing and discharge of raw materials.

[0046] See Figure 2 and Figure 6In some embodiments, the pressing mechanism includes a protective cover 26, which is fixedly connected to the inner wall of the left side of the housing 1. A movable plate 25 is provided on the upper side of the protective cover 26. The bottom surface of the movable plate 25 penetrates the protective cover 26 and is movably connected to it. A spring 27 is sleeved on the inner wall of the movable plate 25. A pressure plate 28 is fixedly connected to the bottom surface of the movable plate 25. A control component is provided on the side wall of the movable plate 25. A movable wheel 37 is rotatably connected to the top surface of the movable plate 25. The movable wheel 37 contacts the cam 24, and the force of the spring 27 keeps the movable plate 25 in contact with the cam 24. This not only assists in material discharge but also prevents material from clogging in the discharge chamber, reducing the probability of later maintenance.

[0047] See Figure 2 and Figure 6 As another implementation of the pressing mechanism:

[0048] The control component includes an insert plate 29, which is located to the left of the movable plate 25. The insert plate 29 passes through the housing 1 and is movably connected to it. A through hole 30 is opened on the top surface of the insert plate 29. A through groove 31 corresponding to the insert plate 29 is opened on the side wall of the movable plate 25. A second push rod 32 is fixedly connected to the top surface of the inner cavity of the protective cover 26. The output end of the second push rod 32 passes through the protective cover 26 and is fixedly connected to a trapezoidal block 33. The trapezoidal block 33 matches the through hole 30. The control component can control the operation and stop of the pressure plate 28. When it stops, it can block the raw material and pause the discharge.

[0049] Through the cooperation of the housing 1, inclined plate 14, pressing mechanism and discharge mechanism, the screened raw materials are mixed by the mixing mechanism and collected in the storage cavity. When the raw materials need to be discharged, the pressing plate 28 can press the raw materials in the storage cavity into the gap between the screw conveyor blades 16, increasing the discharge speed of the raw materials. At the same time, it can also play a guiding role and reduce the probability of raw materials agglomeration. When the discharge stops, the pressing plate 28 can stay in the gap between the inclined plate 14 and the housing 1 to block the raw materials in the storage cavity.

[0050] In use: When raw materials need to be introduced, first open the electric valve 36, and at the same time start the first push rod 5 to drive the screening cylinder 4 to move, so that the feeding pipe 3 is inserted into the screening cylinder 4 and the raw materials are injected into the screening cylinder 4. After the raw materials are injected, the first push rod 5 drives the screening cylinder 4 to reset, and then start the first motor 8. The first motor 8 drives the cylinder 6 to rotate through the limit block 34 on the round rod 7. The cylinder 6 drives the screening cylinder 4 to rotate. The centrifugal force generated by the rotation of the screening cylinder 4 is used to screen out the raw materials and enter the machine casing 1 through the feed pipe 9. When the raw materials in the screening cylinder 4 are screened out, the remaining raw materials are all large particles. Start the first push rod 5 to quickly drive the screening cylinder 4 to move, and then stop quickly. Use inertia to throw out the large particles of raw materials in the screening cylinder 4 and let them fall into the impurity pipe 10 for discharge. This step can be repeated many times before continuing to inject new raw materials into the screening cylinder 4.

[0051] After screening, the raw materials fall onto the guide plate 11. At the same time, the second motor 19 is started. The second motor 19 drives the transmission shaft 15 and the sprocket 20 to rotate. The sprocket 20 drives the round shaft 12 and the cam 24 to rotate through the chain 21. The round shaft 12 drives the mixing plate 13 to rotate, breaking up and mixing the two or more raw materials that fall. The mixed raw materials are collected in the storage chamber.

[0052] At this time, the drive shaft 15 drives the spiral conveyor blade 16 to rotate. If the raw material needs to be discharged in real time, the raw material enters the discharge chamber through the inclined plate 14 and is discharged by the spiral conveyor blade 16. The cam 24 drives the movable plate 25 to reciprocate. The movable plate 25 drives the pressure plate 28 to reciprocate, pressing the raw material in the discharge chamber downward to fill the gap of the spiral conveyor blade 16. This achieves the purpose of rapid discharge and also prevents the raw material from accumulating and sticking in the storage chamber. If discharge is not required, the second push rod 32 can be activated to drive the trapezoidal block 33 to move upward. The inclined surface of the trapezoidal block 33 is inserted into the through hole 30, which can drive the insert plate 29 to move against the movable plate 25. When the insert plate 29 captures the through groove 31, it is directly inserted to fix the movable plate 25. At the same time, the pressure plate 28 seals the discharge chamber to achieve the purpose of material storage and effectively improve the mixing effect.

[0053] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A batching and mixing machine for a borosilicate pharmaceutical glass production line, comprising a housing (1), characterized in that: Two cylinders (2) are provided on the upper side of the casing (1). A feed pipe (9) is fixedly connected to the lower side wall of the cylinder (2). The feed pipe (9) is connected to the casing (1). A feeding pipe (3) is fixedly connected to the upper side wall of the cylinder (2). An electric valve (36) is installed on the side wall of the feeding pipe (3). A screening mechanism is provided inside the cylinder (2). Two guide plates (11) are fixedly connected to the left and right inner walls of the casing (1) near the top surface. A mixing mechanism is provided below the guide plates (11). An inclined plate (14) is fixedly connected to the inner wall of the casing (1). A discharge mechanism is provided below the inclined plate (14). A pressing mechanism is provided near the left side of the inner cavity of the casing (1). The upper side of the inclined plate (14) is a storage cavity, and the gap between the inclined plate (14) and the machine casing (1) is a discharge cavity; The screening mechanism includes a screening cylinder (4), which is located inside the cylinder (2). A first push rod (5) is fixedly connected to the end face of the cylinder (2). The output end of the first push rod (5) passes through the cylinder (2) and is rotatably connected to the end face of the screening cylinder (4). A cylinder (6) is fixedly connected to the inner end face of the screening cylinder (4). A round rod (7) is slidably connected inside the cylinder (6). The other end of the round rod (7) passes through the cylinder (2) and is rotatably connected to it. A first motor (8) is fixedly installed on the other end face of the cylinder (2). The output end of the first motor (8) is fixedly connected to the round rod (7). The feeding pipe (3) penetrates the cylinder (2), and the feeding pipe (3) is L-shaped. The impurity pipe (10) is fixedly connected to the lower side wall of the cylinder (2). The pressing mechanism includes a protective cover (26), which is fixedly connected to the inner wall of the left side of the housing (1). A movable plate (25) is provided on the upper side of the protective cover (26). The bottom surface of the movable plate (25) penetrates the protective cover (26) and is movably connected to it. A spring (27) is sleeved on the inner wall of the movable plate (25) located in the cavity of the protective cover (26). A pressure plate (28) is fixedly connected to the bottom surface of the movable plate (25). A control component is provided on the side wall of the movable plate (25). The control component includes a plug plate (29). The insert plate (29) is located on the left side of the movable plate (25). The insert plate (29) penetrates the housing (1) and is movably connected to it. The top surface of the insert plate (29) is provided with a through hole (30). The side wall of the movable plate (25) is provided with a through groove (31) corresponding to the insert plate (29). The top surface of the inner cavity of the protective cover (26) is fixedly connected to a second push rod (32). The output end of the second push rod (32) penetrates the protective cover (26) and is fixedly connected to a trapezoidal block (33). The trapezoidal block (33) matches the through hole (30).

2. The batching and mixing machine for the borosilicate pharmaceutical glass production line according to claim 1, characterized in that: The mixing mechanism includes two circular shafts (12), which are rotatably connected to the left and right inner walls of the housing (1). Several uniformly distributed mixing plates (13) are fixedly connected to the side walls of the circular shafts (12). The mixing plates (13) are all L-shaped. At least four circular holes are opened on the side walls of the mixing plates (13). A cam (24) is fixedly connected to the front side wall of the circular shafts (12) near the left side. The right end of the round shaft (12) passes through the housing (1) and is fixedly connected to a grooved wheel (22), and a belt (23) is connected between the two grooved wheels (22).

3. The batching and mixing machine for the borosilicate pharmaceutical glass production line according to claim 1, characterized in that: The discharge mechanism includes a drive shaft (15) and a spiral conveyor blade (16). The drive shaft (15) is rotatably connected to the inner wall of the housing (1) near the bottom. The spiral conveyor blade (16) is fixedly connected to the side wall of the drive shaft (15). A discharge nozzle (17) is fixedly connected to the right side wall of the housing (1) near the bottom. A transmission assembly is provided on the left side wall of the housing (1). The transmission assembly includes a housing (18), which is fixedly connected to the left side wall of the housing (1). A second motor (19) is fixedly installed on the left side wall of the housing (18). The left end of the transmission shaft (15) passes through the housing (1) and is fixedly connected to the output shaft of the second motor (19). A sprocket (20) is fixedly connected to the left end of the front round shaft (12) on the side wall of the transmission shaft (15). A chain (21) is connected between the two sprockets (20).

4. The batching and mixing machine for the borosilicate pharmaceutical glass production line according to claim 1, characterized in that: The top surface of the movable plate (25) is rotatably connected to a movable wheel (37).

5. The batching and mixing machine for the borosilicate pharmaceutical glass production line according to claim 1, characterized in that: Two limiting blocks (34) are symmetrically fixedly connected to the side wall of the cylindrical rod (7) near the end face. Two limiting grooves (35) are symmetrically opened on the inner wall of the cylindrical tube (6). The limiting blocks (34) and the limiting grooves (35) are slidably connected.

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