Liquid-free pressurizing equipment for precision bearing steel ball lapping

Abstract

The present application relates to steel ball precision processing technical field, specifically to a kind of precision bearing steel ball precision grinding with no liquid pressurizing equipment, including: processing box, the processing box is used to hold precision grinding fluid, the outer wall of the processing box is fixedly connected with support, the top of the support is fixedly connected with adjusting mechanism, the bottom of the adjusting mechanism is slidably connected with dynamic plate, the present application is adjusted dynamic plate position quickly, accurately according to different size steel ball, ensure that dynamic plate and steel ball are closely matched in precision grinding process, and the height of adjusting dynamic plate is adjusted by the rotation of adjusting screw, on the basis of ensuring pressurizing degree, without using oil as medium, avoid oil leakage, pressure instability, pollution environment, worker falls and many other undesirable phenomena caused by using oil, fundamentally solve the problem, ensure the smooth progress of mill ball, ensure product quality, enhance the versatility and practicality of equipment.

Description

Technical Field

[0001] This invention relates to the field of precision grinding technology for steel balls, and specifically to a liquid-free pressurization device for precision grinding of precision bearing steel balls. Background Technology

[0002] In the field of precision bearing steel ball machining, traditional machining equipment usually relies on oil as a pressurizing medium to apply grinding pressure to the steel balls.

[0003] However, this method has many insurmountable drawbacks. On the one hand, the oil system is prone to oil leaks, which not only wastes oil and increases production costs, but also pollutes the processing environment, hindering workshop cleanliness and safety management. Furthermore, leaked oil creates a slippery surface on the floor, significantly increasing the risk of employees slipping and falling. On the other hand, the pressure stability of the oil pressurization system is poor and difficult to control precisely. This directly affects the uniformity and stability of the pressure applied during the steel ball finishing process, leading to unstable finishing quality and difficulty in guaranteeing product yield, thus failing to meet the increasingly demanding requirements for precision bearing production. In addition, there are deficiencies in the recycling of finishing fluid and the handling of debris during the finishing process. The finishing fluid cannot be effectively filtered and recycled, resulting in resource waste, and the finishing fluid containing debris can cause scratches and other quality problems on the steel ball surface.

[0004] Therefore, in order to overcome the various shortcomings of the above-mentioned traditional equipment, the development of a precision bearing steel ball grinding equipment that can be precisely adjusted, pressurized without liquid, efficiently ground, and easy to maintain has become an urgent need in the industry. This patent was born out of this background. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the technical solution adopted by this invention is as follows: a liquid-free pressurized device for precision grinding of bearing steel balls, comprising: a processing box for holding grinding fluid, a support fixedly connected to the outer wall of the processing box, an adjusting mechanism fixedly connected to the top of the support, a movable plate slidably connected to the bottom of the adjusting mechanism, the adjusting mechanism controlling the movement of the movable plate according to steel balls of different sizes; a grinding mechanism located at the bottom of the adjusting mechanism, the grinding mechanism grinding the steel balls by cooperating with the movable plate; a barrier mechanism located inside the processing box, the barrier mechanism filtering the grinding fluid used in the grinding process; the adjusting mechanism includes a mounting frame, a rotating assembly rotatably connected to the bottom of the mounting frame, an adjusting screw threadedly connected to the inner wall of the rotating assembly, a mounting plate rotatably connected to the bottom of the adjusting screw, limit rods symmetrically fixedly connected to the outer wall of the mounting plate, an adjusting ring threadedly connected to the outer wall of the mounting plate, a connecting ring rotatably connected to the bottom of the adjusting ring, and a limit post provided at the bottom of the mounting plate.

[0006] The invention is further configured such that the outer wall of the mounting frame is fixedly connected to the outer wall of the processing box, the outer wall of the limiting rod is slidably connected to the inner wall of the mounting frame, the adjusting screw passes through the mounting frame, and the outer wall of the mounting plate is slidably connected to the outer wall of the moving plate. The adjusting cylinder in the rotating assembly is threadedly connected to the adjusting screw. Due to the threaded action between the adjusting screw and the adjusting cylinder, and the rotatable connection between its bottom end and the mounting plate, the rotating adjusting screw drives the mounting plate to move up and down until it causes the moving plate to press against the steel ball, thereby adjusting the height of the moving plate.

[0007] The invention is further configured such that a sliding block is slidably connected to the outer wall of the mounting plate, a hook is rotatably connected to the outer wall of the sliding block, the sliding block is fixedly connected to a connecting ring, the outer wall of the limiting post is fixedly connected to the outer wall of the moving plate, the inner wall of the hook is slidably connected to the outer wall of the limiting post, and a pin is slidably connected to the top of the adjusting ring. The moving plate is placed at the bottom of the mounting plate, and the hook is hooked onto the limiting post on the moving plate. Rotating the adjusting ring causes the rotatably connected connecting ring to move, which in turn moves the sliding block. This causes the hook to apply a pulling force to the limiting post, preventing the moving plate from detaching from the mounting plate. The pin further prevents the adjusting ring from rotating on the mounting plate, allowing for quick assembly and disassembly of the moving plate.

[0008] The invention is further configured such that the rotating assembly includes an adjusting cylinder, a toothed ring is fixedly connected to the top end of the adjusting cylinder, a rod is slidably connected to the inner wall of the adjusting cylinder, a fixing rod is fixedly connected to the outer wall of the adjusting cylinder, and a return spring is fixedly connected to the outer wall of the rod. Under the action of the return spring, the rod moves and resets, re-engaging into the toothed ring to prevent vibration during the fine grinding process from causing the adjusting cylinder to loosen and rotate.

[0009] The present invention is further configured such that the inner wall of the adjusting cylinder is threadedly connected to the outer wall of the adjusting screw, the top end of the adjusting cylinder is rotatably connected to the bottom end of the mounting bracket, the outer wall of the insert rod is slidably connected to the inner wall of the toothed ring, the inner wall of the insert rod is slidably connected to the outer wall of the fixing rod, and the end of the return spring away from the insert rod is fixedly connected to the outer wall of the adjusting cylinder.

[0010] The invention is further configured such that the grinding mechanism includes a baffle plate, a stationary plate rotatably connected to the inner wall of the baffle plate, a flow groove formed in the wall of the baffle plate, and a drive motor fixedly connected to the bottom end of the baffle plate via a frame. When the drive motor is started, the stationary plate rotates, and the stationary plate and the moving plate work together to finely grind the steel ball. Simultaneously, a water pump is started to extract the grinding fluid from the processing chamber through a flow pipe, and a telescopic pipe is pulled to guide the grinding fluid between the moving and stationary plates, providing auxiliary lubrication for the steel ball during the grinding process.

[0011] The present invention is further configured such that the outer wall of the baffle is slidably connected to the inner wall of the processing box, and the output end of the drive motor is fixedly connected to the outer wall of the stationary plate.

[0012] The invention is further configured such that the barrier mechanism includes a filter plate, with support rods slidably connected to the inner walls of the four corners of the filter plate, and push springs fixedly connected to the outer wall of the filter plate. A lower pressure plate is provided at the top of the filter plate, and a pull rod is rotatably connected to the outer wall of the lower pressure plate. A water pump is provided outside the filter plate, and a flow pipe is fixedly connected to the outer wall of the water pump. Liquid and debris first contact the lower pressure plate. Under the action of gravity, the lower pressure plate rotates, and through the connection of the pull rod, it drives the filter plate to slide on the support rod. Under the action of the push spring, the filter plate vibrates, preventing debris from clogging the filter plate and affecting filtration.

[0013] The invention is further configured such that the outer wall of the lower pressure plate is slidably connected to the inner wall of the processing box, the end of the pull rod away from the lower pressure plate is rotatably connected to the outer wall of the filter plate, the outer wall of the support rod is fixedly connected to the inner wall of the processing box, the bottom end of the push spring is fixedly connected to the outer wall of the support rod, the bottom end of the flow pipe is fixedly connected to the inner wall of the processing box, and a telescopic tube is fixedly connected to the top end of the flow pipe. The filter plate filters the grinding liquid, and through the flow pipe connected to the processing box, the filtered grinding liquid can be recycled under the action of a water pump.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention, by setting an adjustment mechanism, can quickly and accurately adjust the position of the moving plate according to steel balls of different sizes, ensuring a tight fit between the moving plate and the steel balls during the fine grinding process. Furthermore, the height of the moving plate can be adjusted by rotating the adjusting screw. While ensuring the pressure applied, oil is not required as a medium, avoiding many adverse phenomena caused by the use of oil, such as oil leakage, unstable pressure, environmental pollution, and employee falls. This fundamentally solves the problem, ensures the smooth progress of ball grinding, guarantees product quality, and enhances the versatility and practicality of the equipment.

[0016] 2. By setting up a grinding mechanism, the stationary plate rotates under the drive of the motor and works in conjunction with the moving plate to perform efficient fine grinding of the steel ball. At the same time, the water pump draws the grinding fluid between the moving plate and the stationary plate, which not only plays an auxiliary lubricating role, reducing frictional loss between the steel ball and the grinding parts and improving the grinding efficiency, but also removes the heat and debris generated during the grinding process in time, improving the grinding effect and the surface quality of the steel ball.

[0017] 3. By incorporating a barrier mechanism, this invention allows the filter plate to effectively filter the refining solution, preventing debris accumulation and ensuring the cleanliness of the recycled solution. This avoids adverse effects such as scratches on the steel ball surface caused by impurities, while also reducing waste of the refining solution and lowering production costs. Furthermore, the vibration design and tilting of the filter plate effectively prevent debris from clogging it, facilitating the cleaning of debris accumulated at the bottom of the filter plate. This ensures the long-term stable operation of the filtration system and provides strong support for the continuous and efficient conduct of refining work.

[0018] 4. This invention simplifies and expedites the assembly and disassembly of the moving plate in the adjustment mechanism. Furthermore, during the fine-tuning process, the design of components such as pins and return springs effectively prevents the adjustment components from loosening due to vibration, ensuring the stability of the equipment during operation, reducing downtime caused by equipment failure, and improving production efficiency and product quality stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the barrier mechanism of the present invention;

[0022] Figure 4 This is a schematic diagram of the adjustment mechanism of the present invention;

[0023] Figure 5 This is a schematic diagram of the rotating assembly of the present invention;

[0024] Figure 6 This is the present invention. Figure 4 Enlarged view of the structure at point A;

[0025] Figure 7 This is the present invention. Figure 5 Enlarged view of the structure at point B.

[0026] In the diagram: 1. Processing box; 2. Support; 3. Adjustment mechanism; 31. Mounting bracket; 32. Limiting rod; 33. Rotating assembly; 331. Gear ring; 332. Adjusting cylinder; 333. Insert rod; 334. Fixing rod; 335. Return spring; 34. Adjusting screw; 35. Mounting plate; 36. Pin; 37. Adjusting ring; 38. Limiting post; 39. Connecting ring; 310. Sliding block; 311. Hook; 4. Moving plate; 5. Grinding mechanism; 51. Baffle plate; 52. Stationary plate; 53. Flow channel; 54. Drive motor; 6. Barrier mechanism; 61. Filter plate; 62. Support rod; 63. Push spring; 64. Pull rod; 65. Lower pressure plate; 66. Flow pipe; 67. Water pump; 68. Telescopic pipe. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0028] Please see Figure 1 - Figure 7 This invention provides a technical solution: a liquid-free pressurized device for precision grinding of bearing steel balls, comprising: a processing box 1 for holding grinding liquid, a support 2 fixedly connected to the outer wall of the processing box 1, an adjusting mechanism 3 fixedly connected to the top of the support 2, and a movable plate 4 slidably connected to the bottom of the adjusting mechanism 3, the adjusting mechanism 3 being used to control the movement of the movable plate 4 according to steel balls of different sizes; a grinding mechanism 5 located at the bottom of the adjusting mechanism 3, the grinding mechanism 5 performing precision grinding of the steel balls by cooperating with the movable plate 4; and a barrier mechanism 6. Inside the processing box 1, the barrier mechanism 6 is used to filter the refining liquid used in the refining process; the adjustment mechanism 3 includes a mounting frame 31, the bottom end of the mounting frame 31 is rotatably connected to a rotating component 33, the inner wall of the rotating component 33 is threadedly connected to an adjusting screw 34, the bottom end of the adjusting screw 34 is rotatably connected to a mounting plate 35, the outer wall of the mounting plate 35 is symmetrically fixedly connected to a limit rod 32, the outer wall of the mounting plate 35 is threadedly connected to an adjusting ring 37, the bottom end of the adjusting ring 37 is rotatably connected to a connecting ring 39, and the bottom end of the mounting plate 35 is provided with a limit post 38.

[0029] The outer wall of the mounting bracket 31 is fixedly connected to the outer wall of the processing box 1, the outer wall of the limiting rod 32 is slidably connected to the inner wall of the mounting bracket 31, the adjusting screw 34 passes through the mounting bracket 31, and the outer wall of the mounting plate 35 is slidably connected to the outer wall of the moving plate 4.

[0030] The outer wall of the mounting plate 35 is slidably connected to a sliding block 310, the outer wall of the sliding block 310 is rotatably connected to a hook 311, the sliding block 310 is fixedly connected to the connecting ring 39, the outer wall of the limiting post 38 is fixedly connected to the outer wall of the moving plate 4, the inner wall of the hook 311 is slidably connected to the outer wall of the limiting post 38, and the top of the adjusting ring 37 is slidably connected to a pin 36.

[0031] The rotating assembly 33 includes an adjusting cylinder 332, a toothed ring 331 fixedly connected to the top of the adjusting cylinder 332, an insert rod 333 slidably connected to the inner wall of the adjusting cylinder 332, a fixing rod 334 fixedly connected to the outer wall of the adjusting cylinder 332, and a return spring 335 fixedly connected to the outer wall of the insert rod 333.

[0032] The inner wall of the adjusting cylinder 332 is threadedly connected to the outer wall of the adjusting screw 34. The top end of the adjusting cylinder 332 is rotatably connected to the bottom end of the mounting bracket 31. The outer wall of the insert rod 333 is slidably connected to the inner wall of the toothed ring 331. The inner wall of the insert rod 333 is slidably connected to the outer wall of the fixing rod 334. The end of the return spring 335 away from the insert rod 333 is fixedly connected to the outer wall of the adjusting cylinder 332.

[0033] The grinding mechanism 5 includes a baffle plate 51, a stationary plate 52 rotatably connected to the inner wall of the baffle plate 51, a flow groove 53 opened in the wall of the baffle plate 51, and a drive motor 54 fixedly connected to the bottom end of the baffle plate 51 through a frame.

[0034] The outer wall of the baffle 51 is slidably connected to the inner wall of the processing box 1, and the output end of the drive motor 54 is fixedly connected to the outer wall of the stationary plate 52.

[0035] The barrier mechanism 6 includes a filter plate 61, with support rods 62 slidably connected to the inner walls of the four corners of the filter plate 61, push springs 63 fixedly connected to the outer wall of the filter plate 61, a lower pressure plate 65 provided at the top of the filter plate 61, a pull rod 64 rotatably connected to the outer wall of the lower pressure plate 65, a water pump 67 provided outside the filter plate 61, and a flow pipe 66 fixedly connected to the outer wall of the water pump 67.

[0036] The outer wall of the lower pressure plate 65 is slidably connected to the inner wall of the processing box 1. The end of the pull rod 64 away from the lower pressure plate 65 is rotatably connected to the outer wall of the filter plate 61. The outer wall of the support rod 62 is fixedly connected to the inner wall of the processing box 1. The bottom end of the push spring 63 is fixedly connected to the outer wall of the support rod 62. The bottom end of the flow pipe 66 is fixedly connected to the inner wall of the processing box 1. The top end of the flow pipe 66 is fixedly connected to the telescopic pipe 68.

[0037] Working principle:

[0038] In use, firstly, according to the different sizes of the steel balls, install the moving plate 4 according to different requirements. Through the adjustment mechanism 3, place the moving plate 4 at the bottom of the mounting plate 35, and hook the hook 311 onto the limiting post 38 on the moving plate 4. Then, rotate the adjusting ring 37 to drive the rotating connecting ring 39 to move, so that the connecting ring 39 drives the sliding block 310 to move. As the sliding block 310 moves, the hook 311 applies a pulling force to the limiting post 38, so that the moving plate 4 cannot be detached from the mounting plate 35. Then, through the pin 36, the adjusting ring 37 cannot rotate on the mounting plate 35, so that the moving plate 4 can be quickly disassembled and assembled.

[0039] Next, the steel ball is placed in the groove on the stationary plate 52 by the grinding mechanism 5. When adjusting the position of the moving plate 4 according to the different sizes of steel balls, the operation is carried out by rotating the assembly 33. First, the insert rod 333 is pulled to slide on the fixed rod 334 to release it from the restriction of the toothed ring 331. At this time, the adjusting cylinder 332 in the assembly 33 can be rotated. Through the threaded connection with the adjusting screw 34, due to the thread action between the adjusting screw 34 and the adjusting cylinder 332 and the rotational connection between its bottom end and the mounting plate 35, the adjusting screw 34 rotates and drives the mounting plate 35 to move up and down until it drives the moving plate 4 to press on the steel ball, thereby realizing the adjustment of the height of the moving plate 4. After the adjustment is completed, under the action of the return spring 335, the insert rod 333 moves back to reset and is locked into the toothed ring 331 again to prevent vibration during the fine grinding process, which would cause the adjusting cylinder 332 to loosen and rotate.

[0040] After adjustment, during the fine grinding process, the drive motor 54 will be started to drive the stationary plate 52 to rotate. The stationary plate 52 and the moving plate 4 will work together to fine grind the steel ball. The water pump 67 will be started to extract the fine grinding liquid from the processing box 1 through the flow pipe 66, and the telescopic pipe 68 will be pulled to guide the fine grinding liquid between the moving plate 4 and the stationary plate 52, which will play an auxiliary lubricating role for the steel ball during the fine grinding process. The flow groove 53 opened in the wall of the baffle 51 is used for the liquid and debris during the fine grinding process to flow into the processing box 1.

[0041] The filter plate 61 filters the grinding liquid through the blocking mechanism 6. It is connected to the processing box 1 through the flow pipe 66. Under the action of the water pump 67, the filtered grinding liquid can be recycled. When the liquid and debris in the grinding process flow into the processing box 1, they first contact the lower pressure plate 65. Under the action of gravity, the lower pressure plate 65 rotates in the processing box 1 and drives the filter plate 61 to slide on the support rod 62 through the connection of the pull rod 64. Under the action of the push spring 63, the filter plate 61 vibrates to prevent debris from clogging the filter plate 61 and affecting the filtration. Through the inclined filter plate 61, the debris accumulates at the bottom of the filter plate 61 under the action of vibration. After long-term use, the external compartment can be opened to facilitate the cleaning of debris.

[0042] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A liquid-free pressurizing device for precision grinding of bearing steel balls, characterized in that, include: The processing box (1) is used to hold the fine grinding liquid. The outer wall of the processing box (1) is fixedly connected to the support (2). The top of the support (2) is fixedly connected to the adjustment mechanism (3). The bottom of the adjustment mechanism (3) is slidably connected to the moving plate (4). The adjustment mechanism (3) is used to control the moving plate (4) to move according to different sizes of steel balls. Grinding mechanism (5), the grinding mechanism (5) is located at the bottom of the adjustment mechanism (3), the grinding mechanism (5) performs fine grinding on the steel ball by cooperating with the moving plate (4); A barrier mechanism (6) is located inside the processing box (1) and is used to filter the refining liquid used in the refining process. The adjustment mechanism (3) includes a mounting frame (31), a rotating assembly (33) is rotatably connected to the bottom end of the mounting frame (31), an adjusting screw (34) is threadedly connected to the inner wall of the rotating assembly (33), a mounting plate (35) is rotatably connected to the bottom end of the adjusting screw (34), a limit rod (32) is symmetrically fixedly connected to the outer wall of the mounting plate (35), an adjusting ring (37) is threadedly connected to the outer wall of the mounting plate (35), a connecting ring (39) is rotatably connected to the bottom end of the adjusting ring (37), and a limit post (38) is provided at the bottom end of the mounting plate (35). The rotating assembly (33) includes an adjusting cylinder (332), a toothed ring (331) is fixedly connected to the top end of the adjusting cylinder (332), a plug rod (333) is slidably connected to the inner wall of the adjusting cylinder (332), a fixing rod (334) is fixedly connected to the outer wall of the adjusting cylinder (332), and a return spring (335) is fixedly connected to the outer wall of the plug rod (333). The inner wall of the adjusting cylinder (332) is threadedly connected to the outer wall of the adjusting screw (34). The top end of the adjusting cylinder (332) is rotatably connected to the bottom end of the mounting bracket (31). The outer wall of the insert rod (333) is slidably connected to the inner wall of the toothed ring (331). The inner wall of the insert rod (333) is slidably connected to the outer wall of the fixing rod (334). The end of the return spring (335) away from the insert rod (333) is fixedly connected to the outer wall of the adjusting cylinder (332).

2. The liquid-free pressurizing equipment for precision grinding of bearing steel balls according to claim 1, characterized in that: The outer wall of the mounting bracket (31) is fixedly connected to the outer wall of the processing box (1), the outer wall of the limiting rod (32) is slidably connected to the inner wall of the mounting bracket (31), the adjusting screw (34) passes through the mounting bracket (31), and the outer wall of the mounting plate (35) is slidably connected to the outer wall of the moving plate (4).

3. The liquid-free pressurizing equipment for precision grinding of bearing steel balls according to claim 2, characterized in that: The outer wall of the mounting plate (35) is slidably connected to a sliding block (310), the outer wall of the sliding block (310) is rotatably connected to a hook (311), the sliding block (310) is fixedly connected to a connecting ring (39), the outer wall of the limiting post (38) is fixedly connected to the outer wall of the moving plate (4), the inner wall of the hook (311) is slidably connected to the outer wall of the limiting post (38), and the top end of the adjusting ring (37) is slidably connected to a pin (36).

4. The liquid-free pressurizing equipment for precision grinding of bearing steel balls according to claim 1, characterized in that: The grinding mechanism (5) includes a baffle (51), a stationary plate (52) is rotatably connected to the inner wall of the baffle (51), a flow groove (53) is provided in the wall of the baffle (51), and a drive motor (54) is fixedly connected to the bottom end of the baffle (51) through the frame.

5. The liquid-free pressurizing equipment for precision grinding of bearing steel balls according to claim 4, characterized in that: The outer wall of the baffle (51) is slidably connected to the inner wall of the processing box (1), and the output end of the drive motor (54) is fixedly connected to the outer wall of the stationary plate (52).

6. The liquid-free pressurizing equipment for precision grinding of bearing steel balls according to claim 1, characterized in that: The barrier mechanism (6) includes a filter plate (61), with support rods (62) slidably connected to the inner walls of the four corners of the filter plate (61), and push springs (63) fixedly connected to the outer walls of the filter plate (61). A lower pressure plate (65) is provided at the top of the filter plate (61), and a pull rod (64) is rotatably connected to the outer walls of the lower pressure plate (65). A water pump (67) is provided outside the filter plate (61), and a flow pipe (66) is fixedly connected to the outer walls of the water pump (67).

7. The liquid-free pressurization equipment for precision grinding of bearing steel balls according to claim 6, characterized in that: The outer wall of the lower pressure plate (65) is slidably connected to the inner wall of the processing box (1), the end of the pull rod (64) away from the lower pressure plate (65) is rotatably connected to the outer wall of the filter plate (61), the outer wall of the support rod (62) is fixedly connected to the inner wall of the processing box (1), the bottom end of the push spring (63) is fixedly connected to the outer wall of the support rod (62), the bottom end of the flow pipe (66) is fixedly connected to the inner wall of the processing box (1), and the top end of the flow pipe (66) is fixedly connected to the telescopic pipe (68).

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