Grinding machine

Abstract

The utility model relates to the technical field of polishing machines, in particular to a grinding machine which comprises an installation barrel, a polishing device is installed in the installation barrel, and the installation barrel is provided with a first three-way valve, a second three-way valve, a first air cylinder and a second air cylinder. The first air cylinder and the second air cylinder are each provided with an upper cavity and a lower cavity, and the two upper cavities are each provided with a first air opening and a second air opening. The two lower cavities are respectively provided with a third air port and a fourth air port; the two first air ports are provided with first pressure control valves, the two third air ports are provided with second pressure control valves, and the two second air ports and the two fourth air ports are provided with closing valves. After the technical scheme is adopted, the piston rod of the first air cylinder and the piston rod of the second air cylinder can move synchronously no matter the grinding device slides upwards or downwards, and the sliding stability of the grinding machine is relatively good.

Description

Technical Field

[0001] This utility model relates to the field of polishing machine technology, and specifically to a polishing machine. Background Technology

[0002] Chinese utility model patent document CN 210360769 U discloses an automatic continuous stone grinding machine, including a frame, a conveying mechanism mounted on the frame for conveying stone, a load-bearing beam horizontally supported on the frame and located above the conveying mechanism, multiple grinding head mechanisms mounted on the load-bearing beam, a first drive mechanism for driving the grinding head mechanisms to move longitudinally back and forth, a second drive mechanism for driving the grinding head mechanisms to move up and down, and a third drive mechanism for driving the grinding head mechanisms to rotate. The grinding head mechanism includes a base and a central shaft movably passing through the base, a grinding head located at the bottom of the central shaft, and a second drive mechanism. The second drive mechanism consists of cylinders symmetrically arranged on both sides of the central shaft. A top cover is provided at the top of the central shaft, and each cylinder has a piston seat connected to the base and a piston rod connected to the top cover.

[0003] However, in the same grinding head mechanism of the above-mentioned device, there is no pressure equalization device between the two cylinders, and the synchronization of the piston rod extension and retraction of the two cylinders is relatively poor. For example, the piston rod of one cylinder moves first and the piston rod of the other cylinder moves later, which affects the sliding stability of the central shaft.

[0004] In view of this, the applicant has conducted in-depth research on the above-mentioned issues, which led to this case. Utility Model Content

[0005] The purpose of this invention is to provide a mill with relatively good central axis sliding stability.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A grinding mill includes a vertically arranged mounting cylinder, within which a grinding device is installed. The grinding device includes a central shaft vertically inserted into the mounting cylinder, a grinding disc located below the mounting cylinder and mounted at the lower end of the central shaft, a sliding sleeve sleeved on the central shaft, and a motor pulsatorically connected to the sliding sleeve. The central shaft has an external spline section, and the sliding sleeve has an internal spline hole that mates with the external spline section, the internal spline hole being slidably fitted onto the external spline section. A first bearing is provided between the sliding sleeve and the mounting cylinder.

[0008] The upper end of the central shaft is rotatably connected to a connecting seat located on the upper side of the mounting cylinder;

[0009] The mounting cylinder is equipped with a first three-way valve, a second three-way valve, and a first cylinder and a second cylinder whose piston rods are respectively arranged parallel to the axis of the central shaft.

[0010] Both the first cylinder and the second cylinder have an upper chamber and a lower chamber. The two upper chambers have the same volume and are each provided with a first air port and a second air port. The two lower chambers have the same volume and are each provided with a third air port and a fourth air port. A first pressure control valve is installed in each of the two first air ports, a second pressure control valve is installed in each of the two third air ports, and a closing valve is installed in each of the two second air ports and the two fourth air ports.

[0011] Both the first three-way valve and the second three-way valve have three ports;

[0012] One of the ports of the first three-way valve is used to connect to the air source device, and the other two ports are connected to the two first pressure control valves one by one.

[0013] One of the ports of the second three-way valve is used to connect to the air source device, and the other two ports are connected to the two second pressure control valves one by one.

[0014] The cylinder bodies of the first cylinder and the second cylinder are respectively fixedly connected to the mounting cylinder, and the piston rods of the first cylinder and the second cylinder are respectively fixedly connected to the connecting seat.

[0015] Preferably, the central shaft is fitted with a pulley arranged coaxially with the central shaft, the pulley is located between the mounting cylinder and the connecting seat, and the pulley is fixed on the sliding sleeve;

[0016] The motor is indirectly connected to the sliding sleeve via a drive connection with the belt pulley;

[0017] The central shaft is fitted with a guide cylinder, which is located between the sliding sleeve and the grinding disc. The guide cylinder is located inside the mounting cylinder and is vertically slidably connected to the mounting cylinder. The guide cylinder is rotatably connected to the central shaft.

[0018] Preferably, the outer wall of the guide cylinder is provided with a strip-shaped limiting groove, the strip-shaped limiting groove is arranged parallel to the axis of the central shaft, and the mounting cylinder is equipped with a limiting block inserted through the strip-shaped limiting groove, the limiting block being vertically slidably connected to the strip-shaped limiting groove.

[0019] Preferably, a second bearing and a self-aligning roller bearing are installed between the guide cylinder and the central shaft, with the second bearing located on the inner side of the upper end of the guide cylinder and the self-aligning roller bearing located on the inner side of the lower end of the guide cylinder.

[0020] Preferably, the mounting cylinder has a guide cylinder oil injection hole, and the guide cylinder oil injection hole is arranged side by side with the limiting block;

[0021] The mounting cylinder has a first oil injection hole; one end of the first oil injection hole is close to the first bearing and the end of the first oil injection hole close to the first bearing is located above the first bearing;

[0022] The guide cylinder has a third oil injection channel with an opening facing the self-aligning roller bearing.

[0023] Preferably, the grinding disc includes a grinding head seat located below the central shaft and a connecting disc located below the grinding head seat. The grinding head seat is bolted to the lower end of the central shaft, and the grinding head seat is bolted to the connecting disc. A plurality of grinding blocks are installed at the lower end of the connecting disc, and the plurality of grinding blocks are arranged in a ring around the axis of the connecting disc.

[0024] Preferably, the central axis has a drainage channel arranged coaxially with the central axis;

[0025] The central axis is penetrated at both the upper and lower ends of the drainage channel;

[0026] A water-spreading plate is installed at the lower end of the drainage channel;

[0027] The water distribution plate includes a central plate and several fan plates. The fan plates are evenly arranged along the outer periphery of the central plate. Each fan plate is integrally connected to the central plate. Each fan plate is arranged at an angle relative to the horizontal plane. The fan plates are fixedly connected to the grinding head seat.

[0028] Preferably, each of the grinding blocks has an arc-shaped groove at its lower end, and each arc-shaped groove is arranged in an involute shape with the axis of the connecting disc as the center.

[0029] Preferably, the pulley has a plurality of grooves, and the plurality of grooves are evenly arranged along the axial direction of the pulley;

[0030] The lower end of the pulley is provided with a water guide blind hole, which is connected to a plurality of the pulley grooves.

[0031] Preferably, there are multiple water-guiding blind holes, and the multiple water-guiding blind holes are arranged in a ring around the axis of the pulley.

[0032] The beneficial effects of this utility model after adopting the above technical solution are:

[0033] When the grinding device is to slide downwards, open valves 3 and 4, and close valves 1 and 2. The air supply device pressurizes the first pipeline. Due to the first three-way valve, all pipelines in the upper pipeline group are interconnected and have the same air pressure. When the first air pressure is less than the pressure threshold of pressure control valves 1 and 2, neither valve opens to release pressure, and the piston rods of the first and second cylinders remain stationary. As the first air pressure increases, when it reaches the pressure threshold of pressure control valves 1 and 2, both valves open simultaneously to release pressure. The pressure relief rates are the same. Pressure control valve No. 1 relieves pressure to the upper chamber of the first cylinder through air port No. 1, and pressure control valve No. 2 relieves pressure to the upper chamber of the second cylinder through air port No. 2. The air pressure in the upper chambers of the first and second cylinders rises simultaneously at the same rate. This makes the pressure on the piston rod of the first cylinder from the upper chamber the same as the pressure on the piston rod of the second cylinder from the upper chamber. Consequently, the piston rods of the first and second cylinders move downwards synchronously. The gas in the lower chamber of the first cylinder is discharged through closed valve No. 3, and the gas in the lower chamber of the second cylinder is discharged through closed valve No. 4. The downward sliding stability of the central shaft is relatively good.

[0034] When the grinding device is to slide upwards, open closing valves one and two, and close closing valves three and four. The air source device pressurizes the second pipeline. Due to the second three-way valve, all pipelines in the lower pipeline group are interconnected and have the same air pressure. When the second air pressure is less than the pressure threshold of pressure control valves three and four, neither valve opens to release pressure, and the piston rods of the first and second cylinders remain stationary. As the second air pressure increases, when it reaches the pressure threshold of pressure control valves three and four, both valves simultaneously open to release pressure. The pressure relief rates are the same. Pressure control valve No. 3 relieves pressure to the lower chamber of the first cylinder through port No. 3, and pressure control valve No. 4 relieves pressure to the lower chamber of the second cylinder through port No. 4. The air pressure in the lower chambers of the first and second cylinders rises simultaneously at the same rate. This results in the piston rod of the first cylinder experiencing the same pressure in the lower chamber, and the piston rod of the second cylinder experiencing the same pressure in the lower chamber. Consequently, the piston rods of both cylinders move upward synchronously. The gas in the upper chamber of the first cylinder is discharged through closed valve No. 1, and the gas in the upper chamber of the second cylinder is discharged through closed valve No. 2. The upward sliding stability of the central shaft is relatively good.

[0035] By setting up a first three-way valve, a second three-way valve, a first cylinder, and a second cylinder, the upper chambers of the first and second cylinders are provided with a first air port and a second air port, and the lower chambers of the first and second cylinders are provided with a third air port and a fourth air port. A first pressure control valve is installed on each of the first air ports, a second pressure control valve is installed on each of the third air ports, and a closing valve is installed on each of the second and fourth air ports. One port of the first three-way valve is used to connect to the air source device, and the other two ports are connected to the two first pressure control valves. One port of the second three-way valve is used to connect to the air source device, and the other two ports are connected to the two second pressure control valves. During use, each closing valve is controlled separately, and the air source device pressurizes the upper and lower pipeline groups respectively. Whether the grinding device is to slide upwards or downwards, the piston rods of the first and second cylinders can move synchronously. Therefore, the sliding stability of the central shaft of the mill is relatively good. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the mill of this utility model (the motor and pipeline assembly are not shown in the figure).

[0037] Figure 2 This is a structural schematic diagram of the mill of this utility model from another perspective (the motor and pipeline assembly are not shown in the figure).

[0038] Figure 3 This is a schematic diagram of the pulley structure of this utility model;

[0039] Figure 4 This is a cross-sectional structural diagram of the mill of this utility model (the water distribution plate is not shown in the figure);

[0040] Figure 5 This is a schematic diagram of the connection structure of the air inlet assembly, pipeline assembly, and air source device of this utility model.

[0041] In the picture:

[0042] 100 - Mounting cylinder;

[0043] 110 - First cylinder; 120 - Second cylinder;

[0044] 131 - Air inlet No. 1; 132 - Air inlet No. 2;

[0045] 133 - No. 3 air inlet; 134 - No. 4 air inlet;

[0046] 141 - No. 1 closing valve; 142 - No. 2 closing valve;

[0047] 143 - No. 3 closing valve; 144 - No. 4 closing valve;

[0048] 151 - Pressure control valve No. 1; 152 - Pressure control valve No. 2;

[0049] 153 - Pressure control valve No. 3; 154 - Pressure control valve No. 4;

[0050] 161 - First three-way valve; 162 - Second three-way valve;

[0051] 170 - Limit block;

[0052] 200 - Grinding device; 210 - Connecting seat;

[0053] 220 - Central shaft; 221 - Sliding sleeve;

[0054] 222-Pulley; 2221-Groove;

[0055] 2222-Blind water guide hole;

[0056] 223-Guide cylinder;

[0057] 224 - Drainage channel; 225 - Drip edge;

[0058] 230 - Grinding disc; 231 - Grinding head holder;

[0059] 232-Connecting disc; 233-Grinding block;

[0060] 234 arc-shaped groove;

[0061] 410 - First bearing; 411 - First hole plug;

[0062] 420 - Second bearing;

[0063] 430 - Self-aligning roller bearing; 431 - Third hole plug;

[0064] 440 - Tapered roller bearing assembly; 441 - Fourth hole plug;

[0065] 451 - Guide cylinder oil injection hole plug;

[0066] 510 - Outer convex ring; 520 - Compression nut;

[0067] 530 - Mounting ring; 540 - Lower end cap;

[0068] 999 - Water pipe; 9999 - Gas source device. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0070] like Figures 1-5 As shown, this embodiment provides a mill, including a vertically arranged mounting cylinder 100. For ease of explanation, the side of the mounting cylinder 100 facing the axis of the mounting cylinder 100 is defined as the inside, and the opposite side is defined as the outside.

[0071] A grinding device 200 is installed inside the mounting cylinder 100. The grinding device 200 includes a central shaft 220 vertically inserted inside the mounting cylinder 100, a grinding disc 230 located on the lower side of the mounting cylinder 100 and installed at the lower end of the central shaft 220, a sliding sleeve 221 sleeved on the central shaft 220, and a motor (not shown in the figure) that is drivenly connected to the sliding sleeve 221. The sliding sleeve 221 is vertically slidably connected to the central shaft 220. The central shaft 220 is provided with an external spline section, and the sliding sleeve 221 is provided with an internal spline hole that mates with the external spline section. The internal spline hole is slidably sleeved on the external spline section. A first bearing 410 is provided between the sliding sleeve 221 and the mounting cylinder 100. The first bearing 410 is located on the inner side of the upper end of the mounting cylinder 100.

[0072] A connecting seat 210 is rotatably connected to the upper end of the central shaft 220. A tapered roller bearing assembly 440 is disposed between the central shaft 220 and the connecting seat 210. The tapered roller bearing assembly 440 includes a first tapered roller bearing and a second tapered roller bearing, which are symmetrically arranged. The connecting seat 210 is located above the mounting cylinder 100. As a preferred technical solution, the connecting seat 210 has a fourth oil injection hole at a position corresponding to the tapered roller bearing assembly 440, and a fourth plug 441 is provided on the fourth oil injection hole. Lubricating oil can be easily injected into the tapered roller bearing assembly 440 through the fourth oil injection hole 441, providing necessary lubrication for the operation of the tapered roller bearing assembly 440, reducing friction and wear, and extending the service life of the tapered roller bearing assembly 440.

[0073] The mounting cylinder 100 is provided with a first three-way valve 161, a second three-way valve 162, and a first cylinder 110 and a second cylinder 120 whose piston rods are arranged parallel to the axis of the central shaft 220, respectively. The first cylinder 110 and the second cylinder 120 are arranged symmetrically with the axis of the central shaft 220 as the center, with the piston rods of the first cylinder 110 and the second cylinder 120 facing upwards.

[0074] Both the first cylinder 110 and the second cylinder 120 have an upper chamber and a lower chamber. The two upper chambers have the same volume and are each provided with a first air port and a second air port. That is, the upper chamber of the first cylinder 110 is provided with a first air port and a second air port, and the lower chamber of the second cylinder 120 is provided with a first air port and a second air port. The two lower chambers have the same volume and are each provided with a third air port and a fourth air port. That is, the lower chamber of the first cylinder 110 is provided with a third air port and a fourth air port, and the lower chamber of the second cylinder 120 is provided with a third air port and a fourth air port. For ease of explanation, the first air port of the first cylinder 110 is defined as air port number one 131, the first air port of the second cylinder 120 is defined as air port number two 132, the third air port of the first cylinder 110 is defined as air port number three 133, and the third air port of the second cylinder 120 is defined as air port number four 134.

[0075] Both first air ports are equipped with first pressure control valves, and both third air ports are equipped with second pressure control valves. Specifically, air ports 131 and 132 are equipped with first pressure control valves, and air ports 133 and 134 are equipped with second pressure control valves. For ease of explanation, the first pressure control valve installed on air port 131 is defined as pressure control valve 151, the first pressure control valve installed on air port 132 is defined as pressure control valve 152, the second pressure control valve installed on air port 133 is defined as pressure control valve 153, and the second pressure control valve installed on air port 134 is defined as pressure control valve 154.

[0076] Both second and fourth air ports are equipped with closing valves. For ease of explanation, the closing valve installed on the second air port of the first cylinder 110 is defined as closing valve No. 1 141, the closing valve installed on the second air port of the second cylinder 120 is defined as closing valve No. 2 142, the closing valve installed on the fourth air port of the first cylinder 110 is defined as closing valve No. 3 143, and the closing valve installed on the fourth air port of the second cylinder 120 is defined as closing valve No. 4 144.

[0077] Both the first three-way valve 161 and the second three-way valve 162 have three ports. The three ports of the first three-way valve 161 are the first port, the second port, and the third port. The first port is used to connect to the gas source device 9999, the second port is connected to the first pressure control valve 151 through a pipeline, and the third port is connected to the second pressure control valve 152 through a pipeline. The three ports of the second three-way valve 162 are the fourth port, the fifth port, and the sixth port. The fourth port is used to connect to the gas source device 9999, the fifth port is connected to the third pressure control valve 153 through a pipeline, and the sixth port is connected to the fourth pressure control valve 154 through a pipeline.

[0078] For ease of explanation, each first air port, each second air port, each third air port, and each fourth air port are defined as an air port group, and each first three-way valve 161, each second three-way valve 162, each first pressure control valve, each second pressure control valve, and each closing valve are defined as a pipeline group.

[0079] The cylinder body of the first cylinder 110 and the cylinder body of the second cylinder 120 are respectively fixedly connected to the upper end of the mounting cylinder 100. Specifically, a horizontally arranged mounting plate is integrally connected to the outer side of the upper end of the mounting cylinder 100. The lower end of the cylinder body of the first cylinder 110 and the lower end of the cylinder body of the second cylinder 120 are respectively fixed to the upper end of the mounting plate. The piston rod of the first cylinder 110 and the piston rod of the second cylinder 120 are respectively fixedly connected to the connecting seat 210.

[0080] Before use, set the pressure threshold of pressure control valve 151 and pressure control valve 152 to the same value; set the pressure threshold of pressure control valve 153 and pressure control valve 154 to the same value, and define this value as the second threshold.

[0081] In use, the first port of the first three-way valve 161 is connected to the gas source device 9999 through the first pipeline, and the fourth port of the second three-way valve 162 is connected to the gas source device 9999 through the second pipeline. It should be noted that the gas source device 9999 is an existing conventional device that can be directly purchased on the market. The gas source device 9999 is not part of this utility model but is a conventional supporting facility of this utility model.

[0082] For ease of explanation, the first pipeline, the pipeline between the first three-way valve 161 and the first pressure control valve 151, and the pipeline between the first three-way valve 161 and the second pressure control valve 152 are defined as the upper pipeline group; the second pipeline, the pipeline between the second three-way valve 162 and the third pressure control valve 153, and the pipeline between the second three-way valve 162 and the fourth pressure control valve 154 are defined as the lower pipeline group.

[0083] When the grinding device 200 is to slide downwards, the third closing valve 143 and the fourth closing valve 144 are opened, and the first closing valve 141 and the second closing valve 142 are closed. The air source device 9999 pressurizes the first pipeline. Due to the first three-way valve 161, the pipelines in the upper pipeline group are interconnected and have the same air pressure. The air pressure in each pipeline of the upper pipeline group is defined as the first air pressure. When the first air pressure is less than the pressure threshold of the first pressure control valve 151 and the second pressure control valve 152, neither the first pressure control valve 151 nor the second pressure control valve 152 opens to release pressure, and the piston rods of the first cylinder 110 and the second cylinder 120 do not move. As the first air pressure increases, when the first air pressure reaches the pressure threshold of the first pressure control valve 151 and the second pressure control valve 152, the first pressure control valve 151 and the second pressure control valve 152 simultaneously open. The pressure relief valves are activated at the same rate. Pressure control valve 151 releases pressure to the upper chamber of the first cylinder 110 through port 131, and pressure control valve 152 releases pressure to the upper chamber of the second cylinder 120 through port 132. The air pressure in the upper chambers of the first cylinder 110 and the second cylinder 120 rises simultaneously at the same rate. This results in the piston rod of the first cylinder 110 experiencing the same pressure in the upper chamber as the piston rod of the second cylinder 120. Consequently, the piston rods of the first cylinder 110 and the second cylinder 120 move downwards synchronously. The gas in the lower chamber of the first cylinder 110 is discharged through the third closing valve 143, and the gas in the lower chamber of the second cylinder 120 is discharged through the fourth closing valve 144. Ultimately, this results in relatively good downward sliding stability of the mill's central shaft 220.

[0084] When the grinding device 200 is to slide upwards, the first closing valve 141 and the second closing valve 142 are opened, and the third closing valve 143 and the fourth closing valve 144 are closed. The air source device 9999 pressurizes the second pipeline. Due to the installation of the second three-way valve 162, the pipelines in the lower pipeline group are interconnected and have the same air pressure. The air pressure in each pipeline of the lower pipeline group is defined as the second air pressure. When the second air pressure is less than the pressure threshold of the third pressure control valve 153 and the fourth pressure control valve 154, neither the third pressure control valve 153 nor the fourth pressure control valve 154 opens to release pressure, and the piston rods of the first cylinder 110 and the second cylinder 120 do not move. As the second air pressure increases, when the second air pressure reaches the pressure threshold of the third pressure control valve 153 and the fourth pressure control valve 154, the third pressure control valve 153 and the fourth pressure control valve 154 simultaneously open. The pressure relief valves are activated at the same rate. Pressure control valve 153 releases pressure to the lower chamber of cylinder 110 through port 133, and pressure control valve 154 releases pressure to the lower chamber of cylinder 120 through port 134. The air pressure in the lower chambers of cylinder 110 and cylinder 120 rises simultaneously at the same rate. This results in the piston rod of cylinder 110 experiencing the same pressure in the lower chamber, and the piston rod of cylinder 120 experiencing the same pressure in the lower chamber. Consequently, the piston rods of cylinder 110 and cylinder 120 move upward synchronously. The gas in the upper chamber of cylinder 110 is discharged through closed valve 141, and the gas in the upper chamber of cylinder 120 is discharged through closed valve 142. Ultimately, this results in relatively good upward sliding stability of the mill's central shaft 220.

[0085] The transmission connection structure between the motor and the sliding sleeve 221 is as follows: a pulley 222, coaxially arranged with the central shaft 220, is sleeved on the central shaft 220. The pulley 222 is located between the mounting plate of the mounting cylinder 100 and the connecting seat 210, and is fixed to the sliding sleeve 221 by bolts. The motor is indirectly connected to the sliding sleeve 221 through the transmission connection with the pulley 222. The motor indirectly drives the central shaft 220 to rotate by driving the sliding sleeve 221 to rotate.

[0086] As a preferred technical solution, the pulley 222 has multiple grooves 2221, which are evenly arranged along the axis of the pulley 222. A downward-facing water-guiding blind hole 2222 is provided at the lower end of the pulley 222, and the water-guiding blind hole 2222 communicates with the multiple grooves. By providing the water-guiding blind hole 2222, water in the grooves 2221 can be drained, preventing slippage between the belt and the grooves 2221 due to water. As a preferred technical solution, there are multiple water-guiding blind holes 2222, which are arranged in a ring around the axis of the pulley 222.

[0087] The central shaft 220 is fitted with a guide cylinder 223, which is located between the sliding sleeve 221 and the grinding disc 230. The guide cylinder 223 is located inside the mounting cylinder 100 and is vertically slidably connected to the mounting cylinder 100; the guide cylinder 223 is rotatably connected to the central shaft 220. For ease of explanation, the side of the guide cylinder 223 facing the axis of the guide cylinder 223 is called the inside, and the opposite side is called the outside.

[0088] The connection structure between the guide cylinder 223 and the central shaft 220 is as follows: a second bearing 420 and a self-aligning roller bearing 430 are installed between the guide cylinder 223 and the central shaft 220. The second bearing 420 is located on the inner side of the upper end of the guide cylinder 223, and the self-aligning roller bearing 430 is located on the inner side of the lower end of the guide cylinder 223.

[0089] In this embodiment, the lower part of the central shaft 220 has an outer convex ring 510, and a clamping nut 520 is also spirally connected to the central shaft 220. The lower end of the inner ring of the self-aligning roller bearing 430 abuts against the upper end of the outer convex ring 510, and the clamping nut 520 abuts against the upper end of the inner ring of the self-aligning roller bearing 430. The lower inner wall of the guide cylinder 223 is provided with a mounting ring groove, and a mounting ring sleeve 530 is embedded in the mounting ring groove. An inner convex ring is provided on the inner side of the mounting ring sleeve 530. The guide cylinder 223 has a split structure, including a vertically arranged cylinder and a lower end cap 540 installed at the lower end of the cylinder. The upper end of the outer ring of the self-aligning roller bearing 430 abuts against the lower end of the inner convex ring, and the upper end of the lower end cap 540 abuts against the lower end of the outer ring of the self-aligning roller bearing 430. When the central shaft 220 moves upward, the central shaft 220 drives the guide cylinder 223 to move upward through the self-aligning roller bearing 430; when the central shaft 220 moves downward, the central shaft 220 drives the guide cylinder 223 to move downward through the self-aligning roller bearing 430.

[0090] As a preferred technical solution, the mounting cylinder 100 has a first oil injection hole at a position corresponding to the first bearing 410. One end of the first oil injection hole is close to the first bearing 410, and the end of the first oil injection hole close to the first bearing 410 is located above the first bearing 410. The first oil injection hole is provided with a first plug 411. The guide cylinder 223 has a third oil injection channel with an opening toward the self-aligning roller bearing 430. Specifically, the third oil injection channel includes a first hole section opened in the lower end cover 540 and a blind hole section opened in the cylinder body. The blind hole section communicates with the first hole section and has an opening toward the self-aligning roller bearing 430. The first hole section of the third oil injection hole is provided with a third plug 431.

[0091] A strip-shaped limiting groove is formed on the outer wall of the guide cylinder 223. The strip-shaped limiting groove is arranged parallel to the axis of the central shaft 220 and is located between the upper and lower ends of the guide cylinder 223. A limiting block 170 is installed on the mounting cylinder 100. Specifically, the mounting cylinder 100 has a mounting hole at a position corresponding to the strip-shaped limiting groove. The limiting block 170 is inserted into both the mounting hole and the strip-shaped limiting groove and fixed to the mounting cylinder 100. The limiting block 170 is vertically slidably connected to the strip-shaped limiting groove.

[0092] By opening a strip-shaped limiting groove in the guide cylinder 223 and installing a limiting block 170 in the mounting cylinder 100, it is beneficial to control the stroke range of the guide cylinder 223, thereby controlling the stroke range of the central shaft 220 and preventing excessive movement of the central shaft 220.

[0093] As a preferred technical solution, the mounting cylinder 100 is provided with a guide cylinder oil injection hole, which is arranged side by side with the limiting block 170, and a guide cylinder oil injection hole plug 451 is provided on the guide cylinder oil injection hole.

[0094] Lubricating oil can be easily injected between the mounting cylinder 100 and the guide cylinder 223 through the oil injection hole 451 of the guide cylinder, providing the necessary lubrication for the sliding between the mounting cylinder 100 and the guide cylinder 223, reducing friction and wear, and extending the service life of the mounting cylinder 100 and the guide cylinder 223.

[0095] In this embodiment, the grinding disc 230 includes a grinding head seat 231 located below the central shaft 220 and a connecting disc 232 located below the grinding head seat 231. The grinding head seat 231 is bolted to the lower end of the central shaft 220, and the grinding head seat 231 is bolted to the connecting disc 232. A plurality of grinding blocks 233 are installed at the lower end of the connecting disc 232, and the plurality of grinding blocks 233 are arranged in a ring around the axis of the connecting disc 232.

[0096] As a preferred technical solution, the central shaft 220 has a drainage channel 224 coaxially arranged with it; both the upper and lower ends of the drainage channel 224 penetrate the central shaft 220; a water distribution plate 225 is installed at the lower end of the drainage channel 224; it should be noted that the water distribution plate 225 can adopt a conventional structure. In this embodiment, the water distribution plate 225 includes a central plate and several fan plates, which are evenly arranged along the outer periphery of the central plate. Each fan plate is integrally connected to the central plate and is inclined relative to the horizontal plane. The fan plates are fixedly connected to the grinding head seat 231. In use, the upper end of the drainage channel 224 is connected to the water pipe 999, and water flows through the drainage channel 224 onto the water distribution plate 225 and disperses in all directions. It should be noted that the water pipe 999 is not part of this utility model; it is shown in the figure for ease of understanding.

[0097] As a preferred technical solution, each grinding block 233 has an arc-shaped groove 234 at its lower end, and the arc-shaped grooves 234 are arranged in an involute pattern with the axis of the connecting plate 232 as the center. By setting the arc-shaped grooves 234, it is convenient to discharge the dust generated during the grinding process.

[0098] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, rather than to describe a specific order.

[0099] The present invention has been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, and these modifications all fall within the protection scope of the present invention.

Claims

1. A mill characterized by: The vertical installation cylinder is internally installed with a polishing device, the polishing device comprises a middle shaft vertically penetratingly arranged in the installation cylinder, a polishing disc arranged at the lower side of the installation cylinder and installed at the lower end of the middle shaft, a sliding sleeve sleeved on the middle shaft and a motor in transmission connection with the sliding sleeve, the middle shaft is provided with an external spline section, the sliding sleeve is provided with an internal spline hole matched with the external spline section, and the internal spline hole is sleeved on the external spline section; the first bearing is arranged between the sliding sleeve and the installation cylinder; The upper end of the middle shaft is rotationally connected with a connecting seat arranged at the upper side of the installation cylinder; The installation cylinder is provided with a first three-way valve, a second three-way valve, and a first cylinder and a second cylinder with piston rods arranged in parallel with the axis of the middle shaft; The first cylinder and the second cylinder both have upper cavities and lower cavities, the two upper cavities are of the same volume and are both provided with first air ports and second air ports, the two lower cavities are of the same volume and are both provided with third air ports and fourth air ports, the two first air ports are both installed with first pressure control valves, the two third air ports are both installed with second pressure control valves, and the two second air ports and the two fourth air ports are both installed with closing valves; The first three-way valve and the second three-way valve both have three interfaces; One of the interfaces of the first three-way valve is used for connection with a gas source device, and the other two interfaces are connected with the two first pressure control valves one by one; One of the interfaces of the second three-way valve is used for connection with a gas source device, and the other two interfaces are connected with the two second pressure control valves one by one; The cylinder body of the first cylinder and the cylinder body of the second cylinder are fixedly connected with the installation cylinder, and the piston rod of the first cylinder and the piston rod of the second cylinder are fixedly connected with the connecting seat.

2. The mill of claim 1, wherein: The middle shaft is sleeved with a belt pulley arranged coaxially with the middle shaft, the belt pulley is located between the installation cylinder and the connecting seat, and the belt pulley is fixed on the sliding sleeve; The motor is indirectly in transmission connection with the sliding sleeve through transmission connection with the belt pulley; The middle shaft is sleeved with a guide cylinder, the guide cylinder is located between the sliding sleeve and the polishing disc, the guide cylinder is located in the installation cylinder and is in vertical sliding connection with the installation cylinder, and the guide cylinder is in rotation connection with the middle shaft.

3. The mill of claim 2, wherein: An outer side wall of the guide cylinder is provided with a strip-shaped limiting groove arranged in parallel with the axis of the middle shaft, the installation cylinder is installed with a limiting block penetratingly arranged in the strip-shaped limiting groove, and the limiting block is in vertical sliding connection with the strip-shaped limiting groove.

4. The mill of claim 3, wherein: A second bearing and a self-aligning roller bearing are installed between the guide cylinder and the middle shaft, the second bearing is located at the inner side of the upper end of the guide cylinder, and the self-aligning roller bearing is located at the inner side of the lower end of the guide cylinder.

5. The mill of claim 4, wherein: The installation cylinder is provided with a guide cylinder oil injection hole, and the guide cylinder oil injection hole is arranged side by side with the limiting block. The mounting cylinder is provided with a first oil injection hole; one end of the first oil injection hole is close to the first bearing, and the end of the first oil injection hole close to the first bearing is located above the first bearing; The guide cylinder is provided with a third oil injection channel, and the third oil injection channel has an opening towards the self-aligning roller bearing.

6. The mill of claim 1, wherein: The polishing disc comprises a grinding head base located below the central shaft and a connecting disc located below the grinding head base, the grinding head base is connected to the lower end of the central shaft by bolts, the grinding head base is connected to the connecting disc by bolts, the lower end of the connecting disc is provided with a plurality of polishing blocks, and the polishing blocks are arranged in a ring shape around the axis of the connecting disc.

7. The mill of claim 6, wherein: The central shaft is provided with a drainage channel arranged coaxially with the central shaft; The upper and lower ends of the drainage channel penetrate the central shaft; The lower end of the drainage channel is provided with a water dispersing plate; The water dispersing plate comprises a center plate and a plurality of fan plates, the fan plates are uniformly arranged along the outer periphery of the center plate, the fan plates are integrally connected to the center plate, the fan plates are inclined relative to the horizontal plane, and the fan plates are fixedly connected to the grinding head base.

8. The mill of claim 7, wherein: The lower end of each polishing block is provided with an arc-shaped groove, and the arc-shaped grooves are arranged as involutes around the axis of the connecting disc.

9. The mill of claim 2, wherein: The pulley has a plurality of wheel grooves, and the wheel grooves are uniformly arranged along the axis direction of the pulley; The lower end of the pulley is provided with a water guide blind hole, and the water guide blind hole is in communication with the wheel grooves.

10. A mill as claimed in claim 9, characterised in that: The water guide blind hole has a plurality of water guide blind holes, and the water guide blind holes are arranged in a ring shape around the axis of the pulley.

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