A device for polishing the outer wall of a pot body

Abstract

The utility model discloses a kind of outer wall polishing devices for pot production, including workbench, polishing mechanism, and the drive fixedly installed at the bottom of workbench, the side of the top of workbench is fixedly installed with portal frame, the middle of the top of workbench is installed with rotary support mechanism, and polishing mechanism includes hydraulic cylinder and guide sleeve, hydraulic cylinder is fixedly installed at the middle of the top of portal frame, guide sleeve is fixedly installed at the top of portal frame inner cavity and the position close to hydraulic cylinder telescopic end, square guide pillar is slidably installed in the inside of guide sleeve, the telescopic end of hydraulic cylinder is fixedly connected with U-shaped frame, polishing belt is fixedly installed at the bottom of the bottom of U-shaped frame surface and the position close to polishing belt, pressure cleaning assembly is installed, the utility model relates to polishing technical field.The outer wall polishing device for pot production reaches the purpose of uniform polishing, can be adapted to semicircular iron pot outer wall, and polishing is fast and uniform, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of polishing technology, specifically to an outer wall polishing device for pot body production. Background Technology

[0002] With rapid social development and continuous technological progress, people's living standards have significantly improved. Iron pots are a very common kitchen cooking utensil. In the production of iron pots, they are usually cast in one piece. This process can easily cause impurities to adhere to the outer wall of the pot. Therefore, after casting, the iron pot blank is ground using a grinding machine to create a rougher surface, facilitating subsequent processing. A semi-circular iron pot is a type of iron pot with a hemispherical core structure, characterized by its deep cavity and large capacity, making it particularly suitable for stewing, braising, and other cooking methods that require a lot of broth.

[0003] Currently, existing grinding equipment is not well adapted to the outer wall of semi-circular iron pots, resulting in poor compatibility between the grinding equipment and the outer wall of the semi-circular iron pot, leading to uneven grinding and affecting the grinding effect. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an outer wall grinding device for pot body production, which solves the problem of uneven grinding of the outer wall of semi-circular iron pots due to poor compatibility between the grinding device and the outer wall of the semi-circular iron pot.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An apparatus for grinding the outer wall of a pot body during production, comprising: A workbench, and a drive fixedly installed at the bottom of the workbench, a gantry frame fixedly installed at the side of the top of the workbench, and a rotating support mechanism installed at the middle of the top of the workbench. The grinding mechanism includes a hydraulic cylinder and a guide sleeve. The hydraulic cylinder is fixedly installed at the middle of the top of the gantry frame. The guide sleeve is fixedly installed at the top of the inner cavity of the gantry frame and near the telescopic end of the hydraulic cylinder. A square guide post is slidably installed inside the guide sleeve. A U-shaped frame is fixedly connected to the telescopic end of the hydraulic cylinder. A grinding belt is fixedly installed at the bottom end of the U-shaped frame. A pressure-bearing cleaning component is installed at the bottom of the surface of the U-shaped frame and near the grinding belt. By extending the telescopic end of the hydraulic cylinder, a downward pushing force can be applied to the U-shaped frame, which can then move the U-shaped frame downward. With the support and guidance of the guide sleeve, the square guide post supports and guides the U-shaped frame, allowing the U-shaped frame to drive the grinding belt to move smoothly downward without shaking. The height of the grinding belt can be adjusted so that the grinding belt is in a suitable position with the outer wall of the pot, which helps to grind the outer wall of the pot.

[0006] Preferably, the top of the U-shaped frame is fixedly installed to the bottom of the square guide post, the hydraulic cylinder and the square guide post are both installed vertically, and the grinding belt is curved.

[0007] By utilizing the fact that the bottom end of the U-shaped frame, near the square guide post, is higher, and the end of the U-shaped frame, near the supporting shell, is lower, the polishing belt is inclined and curved. This allows the polishing belt to become taut after its bottom contacts the outer wall of the pot to be polished. This makes it easy to adapt to the semi-circular curved surface of the pot, making it highly adaptable and reducing limitations.

[0008] Preferably, the pressure-bearing cleaning component includes a supporting shell, which is fixedly installed on the bottom of the U-shaped frame surface. A pressure plate is hinged to the side of the inner cavity of the supporting shell. An elastic airbag is installed between the surface of the pressure plate and the inner wall of the supporting shell. A reset spring is fixedly connected between the end of the pressure plate and the inner wall of the supporting shell. A forked three-way pipe is fixedly installed on the top side of the supporting shell. An air outlet one-way valve is installed in the middle of the surface of the forked three-way pipe. An air inlet one-way valve is installed at the air inlet of the elastic airbag. An air outlet at the top of the forked three-way pipe is connected to a jet nozzle.

[0009] By utilizing the contact between the end of the actuating teeth and the surface of the pressure plate, the pressure plate is subjected to a actuating force as the actuating teeth continue to rotate. The pressure plate rotates inward toward the inner side of the supporting shell to adjust its angle. The reset spring is compressed and undergoes elastic deformation, and the elastic airbag is squeezed and reduced in size. The airflow direction inside the elastic airbag is controlled by the exhaust one-way valve and the intake one-way valve, allowing the air inside the elastic airbag to enter the interior of the forked three-way pipe and be sprayed out from the jet nozzle toward the outer wall of the pot being polished. This blows away the abrasive dust deposited on the outer wall of the pot, cleaning the dust and reducing the impact of abrasive dust. As the actuating teeth separate from the pressure plate, the actuating force on the pressure plate disappears, and under the elastic force of the reset spring, it rotates in the opposite direction. The elastic airbag inflates by inhaling air, facilitating subsequent continuous jet cleaning.

[0010] Preferably, the bottom end of the forked three-way tube is connected to the air port at the top of the elastic airbag, and the jet nozzle is installed at an angle.

[0011] Preferably, the rotary support mechanism includes a support shaft. The middle of the outer circular surface of the support shaft is rotatably mounted to the middle of the top of the worktable via a bushing. A cylinder is fixedly connected to the top of the support shaft. An electric telescopic rod is fixedly installed on the side of the inner side of the cylinder. An electromagnet is fixedly installed at the telescopic end of the electric telescopic rod. A circular guide rod is fixedly connected to the bottom edge of the electromagnet. A actuating tooth is fixedly connected to the middle of the outer circular surface of the cylinder. When the electromagnet is energized, the magnetic attraction generated by the electromagnet magnetically attracts and fixes the iron pot blank. The electric telescopic rod is activated. The contraction of the telescopic end of the electric telescopic rod moves the electromagnet downward, causing the iron pot blank, which is magnetically fixed by the electromagnet, to move downward together. This allows the bottom edge of the iron pot to fit against the top of the actuating tooth, thus supporting the pot blank. The pot blank is less likely to tilt or shift, which helps with accurate grinding later.

[0012] Preferably, the bottom end of the supporting shaft is fixedly installed to the output end of the driver via a coupling, and the top of the electromagnet is a semi-circular curved surface.

[0013] By rotating the output of the driver, the support shaft can be driven to rotate, causing the cylinder to rotate along with the support shaft. This, in turn, causes the iron pot blank, which is magnetically attracted and fixed by the electromagnet, to rotate in a circular motion. The rotation of the iron pot blank facilitates the contact between the grinding belt and the outer wall of the iron pot blank for grinding.

[0014] Preferably, the outer circular surface of the circular guide rod is slidably installed between the outer circular surface of the cylinder and the surface of the cylinder. There are three circular guide rods, and the three circular guide rods are evenly installed along the circumferential direction of the cylinder's axis.

[0015] Beneficial effects This invention provides an outer wall grinding device for pot body production. It has the following beneficial effects: I. This outer wall grinding device for pot body production utilizes the extension of the hydraulic cylinder's telescopic end to apply a downward pushing force to the U-shaped frame, causing the U-shaped frame to move downwards. Under the support and guidance of the guide sleeve, the square guide column supports and guides the U-shaped frame, allowing the U-shaped frame to drive the grinding belt to move smoothly downwards without swaying. The height of the grinding belt is adjusted to ensure that the grinding belt is in a suitable position with the outer wall of the pot body, which helps to grind the outer wall of the pot body.

[0016] II. The outer wall grinding device used for pot body production utilizes the bottom end of the U-shaped frame, which is higher at the end near the square guide post and lower at the end near the supporting shell, so that the grinding belt is inclined and the grinding belt is curved. After the bottom of the grinding belt contacts the outer wall of the pot body to be ground, the grinding belt becomes taut, which is convenient to adapt to the semi-circular curved surface of the pot body, has strong adaptability, and reduces limitations.

[0017] 3. The outer wall grinding device used for pot body production utilizes the pressure plate being subjected to a pulling force, which rotates the pressure plate towards the inner side of the supporting shell for angle adjustment. The reset spring is compressed and undergoes elastic deformation, and the elastic airbag is squeezed and reduced in size. The air flow direction inside the elastic airbag is controlled by the air outlet one-way valve and the air inlet one-way valve, so that the air inside the elastic airbag enters the interior of the forked three-way pipe and is sprayed out from the air nozzle onto the outer wall of the pot being ground, blowing away the grinding dust deposited on the outer wall of the pot, cleaning the dust, and reducing the impact of grinding dust.

[0018] IV. The outer wall grinding device used in pot body production utilizes the magnetic attraction force generated by an electromagnet to magnetically fix the iron pot body blank. The electric telescopic rod is activated, and the contraction of its extension end moves the electromagnet downwards, causing the iron pot body blank, which is magnetically fixed by the electromagnet, to move downwards as well. This allows the bottom edge of the iron pot body to align with the top of the agitator teeth, thus supporting the pot body blank and preventing it from tilting or shifting, which helps in subsequent accurate grinding.

[0019] 5. The outer wall grinding device used for pot body production utilizes the rotation of the output end of the driver to drive the support shaft to rotate, so that the cylinder will rotate together with the support shaft, thereby driving the iron pot body blank fixed by the electromagnet to rotate in a circle. The rotation of the iron pot body blank facilitates the contact between the grinding belt and the outer wall of the iron pot body blank for grinding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the outer wall grinding device for pot body production according to this utility model; Figure 2 This is a bottom view of the outer wall grinding device for pot body production according to this utility model; Figure 3 This is a schematic diagram of the connection structure between the pressure-bearing cleaning component and the gantry frame of this utility model; Figure 4 This is a schematic diagram of the overall structure of the pressure-bearing cleaning component of this utility model; Figure 5 This is a schematic diagram of the connection structure between the rotary support mechanism and the worktable of this utility model.

[0021] In the diagram: 1. Workbench; 2. Driver; 3. Gantry frame; 4. Rotary support mechanism; 5. Grinding mechanism; 41. Support shaft; 42. Cylinder; 43. Electric telescopic rod; 44. Electromagnet; 45. Round guide rod; 46. Actuating gear; 51. Hydraulic cylinder; 52. Guide sleeve; 53. Square guide post; 54. U-shaped frame; 55. Grinding belt; 56. Pressure cleaning assembly; 561. Support shell; 562. Pressure plate; 563. Elastic airbag; 564. Reset spring; 565. Forked tee pipe; 566. Outlet check valve; 567. Inlet check valve; 568. Air nozzle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 This utility model provides a technical solution: an outer wall grinding device for pot body production, comprising: Workbench 1, and drive 2 fixedly installed at the bottom of workbench 1, gantry frame 3 fixedly installed at the top side of workbench 1, and rotary support mechanism 4 installed at the middle of the top of workbench 1. The grinding mechanism 5 includes a hydraulic cylinder 51 and a guide sleeve 52. The hydraulic cylinder 51 is fixedly installed at the middle of the top of the gantry frame 3. The guide sleeve 52 is fixedly installed at the top of the inner cavity of the gantry frame 3 and near the telescopic end of the hydraulic cylinder 51. A square guide post 53 is slidably installed inside the guide sleeve 52. A U-shaped frame 54 is fixedly connected to the telescopic end of the hydraulic cylinder 51. A grinding belt 55 is fixedly installed at the bottom end of the U-shaped frame 54. A pressure-bearing cleaning component 56 is installed at the bottom of the surface of the U-shaped frame 54 and near the grinding belt 55. When the hydraulic cylinder 51 is activated, it applies a downward pushing force to the U-shaped frame 54 by extending the telescopic end of the hydraulic cylinder 51, thus causing the U-shaped frame 54 to... 4. Move downwards, and under the support and guidance of the guide sleeve 52, the square guide post 53 supports and guides the U-shaped frame 54, so that the U-shaped frame 54 drives the grinding belt 55 to move downwards smoothly without shaking, and adjusts the height of the grinding belt 55 so that the grinding belt 55 is in a suitable position with the outer wall of the pot, which helps to grind the outer wall of the pot. After grinding is completed, the retraction of the extension end of the hydraulic cylinder 51 can apply an upward pulling force to the U-shaped frame 54, so that the grinding belt 55 can be driven upwards through the U-shaped frame 54, thereby separating the grinding belt 55 from the outer wall of the pot, which is convenient for feeding new pot blanks and helps with batch grinding.

[0024] The top of the U-shaped frame 54 is fixedly installed at the bottom of the square guide post 53. The hydraulic cylinder 51 and the square guide post 53 are both installed vertically. The grinding belt 55 is curved. The bottom end of the U-shaped frame 54, which is closer to the square guide post 53, is higher, and the end of the U-shaped frame 54, which is closer to the supporting shell 561, is lower. This makes the grinding belt 55 tilted. Since the grinding belt 55 is curved, after the bottom of the grinding belt 55 contacts the outer wall of the pot body to be ground, the grinding belt 55 becomes taut, which is convenient for adapting to the semi-circular curved surface of the pot body.

[0025] The pressure-bearing cleaning component 56 includes a support housing 561, which is fixedly mounted on the bottom of the surface of the U-shaped frame 54. A pressure plate 562 is hinged to the side of the inner cavity of the support housing 561. An elastic airbag 563 is installed between the surface of the pressure plate 562 and the inner wall of the support housing 561. A reset spring 564 is fixedly connected between the end of the pressure plate 562 and the inner wall of the support housing 561. A forked three-way pipe 565 is fixedly mounted on the top side of the support housing 561. An air outlet check valve 566 is installed in the middle of the surface of the forked three-way pipe 565. An air inlet check valve 567 is installed at the air inlet of the elastic airbag 563. An air outlet at the top of the forked three-way pipe 565 is connected to a jet nozzle 568. The pressure plate 562 is subjected to a pushing force. 62 rotates inward to the inside of the supporting shell 561 to adjust the angle. The reset spring 564 is compressed and undergoes elastic deformation, and the elastic airbag 563 is squeezed and reduced in size. The airflow direction inside the elastic airbag 563 is controlled by the exhaust one-way valve 566 and the intake one-way valve 567, so that the air inside the elastic airbag 563 enters the interior of the forked three-way pipe 565 and is sprayed out from the jet nozzle 568 onto the outer wall of the pot being polished, blowing away the abrasive dust deposited on the outer wall of the pot and cleaning the dust. As the actuating tooth 46 separates from the pressure plate 562, the actuating force on the pressure plate 562 disappears, and under the elastic force of the reset spring 564, it rotates in the opposite direction, and the elastic airbag 563 inhales and expands, which facilitates subsequent continuous jet cleaning.

[0026] The bottom end of the forked three-way tube 565 is connected to the air port at the top of the elastic airbag 563, and the jet nozzle 568 is installed at an angle.

[0027] The rotary support mechanism 4 includes a support shaft 41. The middle of the outer surface of the support shaft 41 is rotatably mounted to the middle of the top of the worktable 1 via a bushing. A cylinder 42 is fixedly connected to the top of the support shaft 41. An electric telescopic rod 43 is fixedly installed on the side of the inner side of the cylinder 42. An electromagnet 44 is fixedly installed at the telescopic end of the electric telescopic rod 43. A circular guide rod 45 is fixedly connected to the bottom edge of the electromagnet 44. A prying tooth 46 is fixedly connected to the middle of the outer surface of the cylinder 42 to tilt the pot body to be polished. The electromagnet 44 is attached to the top and energized. The electromagnet 44 uses its magnetic attraction to magnetically fix the iron pot blank. The electric telescopic rod 43 is activated. The extension of the telescopic end of the electric telescopic rod 43 can move the electromagnet 44 downward, which in turn moves the iron pot blank fixed by the electromagnet 44 downward. This allows the bottom edge of the iron pot to fit against the top of the actuating tooth 46, thus supporting the pot blank and preventing it from tilting or shifting.

[0028] The bottom end of the supporting shaft 41 is fixedly installed to the output end of the driver 2 via a coupling. The top of the electromagnet 44 is a semi-circular curved surface. When the operator turns on the driver 2, the rotation of the output end of the driver 2 can drive the supporting shaft 41 to rotate, so that the cylinder 42 will rotate together with the supporting shaft 41. This will drive the iron pot blank, which is magnetically fixed by the electromagnet 44, to rotate in a circle. The rotation of the iron pot blank makes it easier to contact the outer wall of the iron pot blank with the grinding belt 55 for grinding.

[0029] The outer circular surface of the circular guide rod 45 is slidably installed between the surface of the cylinder 42 and the outer circular surface of the cylinder 42. There are three circular guide rods 45, and the three circular guide rods 45 are evenly installed along the circumferential direction of the axis of the cylinder 42.

[0030] In use, the operator first places the pot body to be polished upside down on top of the electromagnet 44 and energizes the electromagnet 44. The electromagnet 44 uses magnetic attraction to fix the iron pot body blank. The electric telescopic rod 43 is then activated. The extension of the extension end of the electric telescopic rod 43 can move the electromagnet 44 downward, which in turn moves the iron pot body blank fixed by the electromagnet 44 downward. This allows the bottom edge of the iron pot body to fit against the top of the agitator 46, thus supporting the pot body blank and preventing it from tilting or shifting. The staff turns on the driver 2 to start working. By rotating the output end of the driver 2, the support shaft 41 can be driven to rotate, so that the cylinder 42 will rotate together with the support shaft 41. This will drive the iron pot body blank, which is magnetically fixed by the electromagnet 44, to rotate in a circle. The operator then activates the hydraulic cylinder 51. By extending the telescopic end of the hydraulic cylinder 51, a downward pushing force is applied to the U-shaped frame 54, causing the U-shaped frame 54 to move downward. Under the support and guidance of the guide sleeve 52, the square guide post 53 supports and guides the U-shaped frame 54, allowing the U-shaped frame 54 to drive the grinding belt 55 to move downward smoothly without shaking. The height of the grinding belt 55 is adjusted so that the grinding belt 55 is in a suitable position with the outer wall of the pot body, and grinding is performed through the contact between the grinding belt 55 and the outer wall of the iron pot body blank. Furthermore, by utilizing the fact that the bottom end of the U-shaped frame 54 and the end near the square guide post 53 is higher, and the end of the U-shaped frame 54 and the end near the supporting shell 561 is lower, the polishing belt 55 is inclined and the polishing belt 55 is curved. This allows the polishing belt 55 to become taut after the bottom of the polishing belt 55 contacts the outer wall of the pot body to be polished, making it easier to adapt to the semi-circular curved surface of the pot body. Simultaneously, the pressure plate 562 is subjected to a pulling force, causing it to rotate inward toward the supporting shell 561 for angle adjustment. The reset spring 564 is compressed and undergoes elastic deformation, while the elastic airbag 563 is squeezed and reduced in size. The airflow direction inside the elastic airbag 563 is controlled by the exhaust one-way valve 566 and the intake one-way valve 567, allowing the air inside the elastic airbag 563 to enter the interior of the forked three-way pipe 565 and be sprayed out from the jet nozzle 568 toward the outer wall of the pot being polished, blowing away the abrasive dust deposited on the outer wall of the pot and cleaning the dust. As the agitator 46 separates from the pressure plate 562, the pulling force on the pressure plate 562 disappears, and under the elastic force of the reset spring 564, it rotates in the opposite direction, causing the elastic airbag 563 to inhale and expand, facilitating subsequent continuous jet cleaning. After grinding is completed, the retraction of the extension end of the hydraulic cylinder 51 can apply an upward pulling force to the U-shaped frame 54, which can then drive the grinding belt 55 upward, thereby separating the grinding belt 55 from the outer wall of the pot body. This facilitates the feeding of new pot body blanks and helps with batch grinding.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for grinding the outer wall of a pot body during production, characterized in that, include: A workbench (1), and a driver (2) fixedly installed at the bottom of the workbench (1), a gantry frame (3) fixedly installed at the top side of the workbench (1), and a rotating support mechanism (4) installed at the middle of the top of the workbench (1). The grinding mechanism (5) includes a hydraulic cylinder (51) and a guide sleeve (52). The hydraulic cylinder (51) is fixedly installed at the middle of the top of the gantry frame (3). The guide sleeve (52) is fixedly installed at the top of the inner cavity of the gantry frame (3) and near the telescopic end of the hydraulic cylinder (51). A square guide post (53) is slidably installed inside the guide sleeve (52). A U-shaped frame (54) is fixedly connected to the telescopic end of the hydraulic cylinder (51). A grinding belt (55) is fixedly installed at the bottom of the U-shaped frame (54). A pressure cleaning component (56) is installed at the bottom of the surface of the U-shaped frame (54) and near the grinding belt (55).

2. The outer wall grinding device for pot body production according to claim 1, characterized in that: The top of the U-shaped frame (54) is fixedly installed at the bottom of the square guide post (53). The hydraulic cylinder (51) and the square guide post (53) are both installed vertically. The grinding belt (55) is curved.

3. The outer wall grinding device for pot body production according to claim 1, characterized in that: The pressure cleaning assembly (56) includes a support shell (561), which is fixedly installed on the bottom of the surface of the U-shaped frame (54). A pressure plate (562) is hinged to the side of the inner cavity of the support shell (561). An elastic airbag (563) is installed between the surface of the pressure plate (562) and the inner wall of the support shell (561). A reset spring (564) is fixedly connected between the end of the pressure plate (562) and the inner wall of the support shell (561). A forked three-way pipe (565) is fixedly installed on the side of the top of the support shell (561). An air outlet one-way valve (566) is installed in the middle of the surface of the forked three-way pipe (565). An air inlet one-way valve (567) is installed at the air inlet of the elastic airbag (563). An air outlet at the top of the forked three-way pipe (565) is connected to a jet nozzle (568).

4. The outer wall grinding device for pot body production according to claim 3, characterized in that: The bottom end of the forked three-way tube (565) is connected to the air port at the top of the elastic airbag (563), and the jet nozzle (568) is installed at an angle.

5. The outer wall grinding device for pot body production according to claim 1, characterized in that: The rotary support mechanism (4) includes a support shaft (41). The middle of the outer circular surface of the support shaft (41) is rotatably installed with the middle of the top of the workbench (1) through a bushing. A cylinder (42) is fixedly connected to the top of the support shaft (41). An electric telescopic rod (43) is fixedly installed on the side of the inner side of the cylinder (42). An electromagnet (44) is fixedly installed at the telescopic end of the electric telescopic rod (43). A circular guide rod (45) is fixedly connected to the bottom edge of the electromagnet (44). A toggle tooth (46) is fixedly connected to the middle of the outer circular surface of the cylinder (42).

6. The outer wall grinding device for pot body production according to claim 5, characterized in that: The bottom end of the support shaft (41) is fixedly installed to the output end of the driver (2) via a coupling, and the top of the electromagnet (44) is a semi-circular curved surface.

7. The outer wall grinding device for pot body production according to claim 5, characterized in that: The outer circular surface of the circular guide rod (45) is slidably installed between the outer circular surface of the cylinder (42) and the surface of the cylinder (42). There are three circular guide rods (45), and the three circular guide rods (45) are evenly installed along the circumferential direction of the axis of the cylinder (42).

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