An automatic plate grinding machine

Abstract

The present application belongs to the technical field of polishing, and particularly relates to an automatic plate grinding machine, which comprises a rack, a clamping assembly, a four-axis driving polisher and an identification assembly. The clamping assembly is arranged in the rack, the four-axis driving polisher is installed on the rack, and the identification assembly is installed on one side of the rack, and the identification end of the identification assembly is arranged towards the clamping assembly. The automatic plate grinding machine is used for lifting the holder first, placing the plate on the holder for clamping and fixing, then irradiating the stone by the identification assembly, identifying the polishing position, lifting the stopper on the side opposite to the surface to be polished to stop the plate when polishing, preventing the plate from being easily broken due to vertical stress during polishing, moving the four-axis driving polisher to the other side after polishing one side, then lifting the stopper on the other side, and lowering the stopper on the surface to be polished to reset, so that vertical polishing is realized, manual turning over is not needed, and the efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of polishing technology, specifically relating to an automatic plate polishing machine. Background Technology

[0002] Grinding machines are mainly used for grinding, cleaning, and surface treatment of plates. In existing technology, grinding machines generally include a frame, grinding heads mounted on the frame, and other transmission and adjustment devices.

[0003] However, the grinding machines currently on the market have complex structures and limited functions. When grinding, the plate can be placed flat on the grinding machine and then ground by the grinding head while water is sprayed. After one side is ground, it needs to be manually flipped over and fixed before the other side can be ground. When flipping the plate, water molecules will form a thin water film on its surface, generating surface tension that causes the plate to adhere tightly to the water surface, making it difficult to flip. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an automatic grinding machine that can grind vertically without having to manually flip the plate, thereby increasing efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic grinding machine, including a frame, a clamping assembly, a four-axis driven grinder, and an identification assembly. The clamping assembly is disposed inside the frame, the four-axis driven grinder is mounted on the frame, and the identification assembly is mounted on one side of the frame with its identification end facing the clamping assembly. The clamping assembly includes a fixed platform, a clamp, two abutments, and three lifters. The fixed platform is fixedly installed inside the frame, and the three lifters are installed side by side below the fixed platform. The clamp and the two abutments are respectively fixedly connected to the lifting ends of the three lifters, and the clamp is located between the two abutments. The fixed platform is provided with a transition groove for the clamp and the two abutments to extend out, and the top of the clamp and the two abutments is provided with a baffle plate adapted to the transition groove.

[0006] The four-axis driven grinder includes a first horizontal moving screw assembly, a second horizontal moving screw assembly, a lifting screw assembly, a rotating assembly, and a grinding head. The first horizontal moving screw assembly is mounted on the frame, the second horizontal moving screw assembly is mounted on the drive end of the first horizontal moving screw assembly, the lifting screw assembly is mounted on the drive end of the second horizontal moving screw assembly, the rotating assembly is mounted on the lifting end of the lifting screw assembly, and the grinding head is mounted on the rotating end of the rotating assembly.

[0007] The identification component includes a support rod, a rotary motor, and a device camera. The support rod is fixedly installed on one side of the frame and extends above the fixed platform. The rotary motor is installed at one end of the support rod, and the device camera is installed on the drive end of the rotary motor. A main control box connected to the device camera signal is installed on the frame.

[0008] A support column is installed on one side of the frame, a rotating machine is installed on the top of the support column, and the support rod is installed on the rotating machine.

[0009] The clamping device includes a support frame, a bottom cylinder lifting component, and multiple clamping cylinders. The support frame is installed on the lifting end of the lifting device, and the bottom cylinder lifting component is installed on the bottom of the support frame. The bottom of the support frame is provided with two limiting plates placed on both sides of the lifting end of the bottom cylinder lifting component. The multiple clamping cylinders are divided into two groups and symmetrically installed on both sides of the frame inside the support frame, with their clamping ends facing each other. The clamping end of each clamping cylinder is provided with a clamping plate, and the thickness of the clamping plate is less than the thickness of the plate to be ground.

[0010] The plurality of clamping cylinders are arranged at equal intervals along the height of the support frame.

[0011] The abutment includes a lifting frame, two abutment rods, and two sets of drive abutment groups. The lifting frame is installed on the lifting end of the lifting device. The two sets of drive abutment groups are symmetrically installed on both sides of the lifting frame. The two ends of the two abutment rods are respectively installed on the drive ends of the two sets of drive abutment groups. Two abutment plates are detachably installed on the two abutment rods.

[0012] The abutting rod is provided with a sliding groove, the abutting plate is provided with a slider that is slidably placed in the sliding groove, the slider is elastically connected with a locking post, and the abutting rod is provided with a locking groove that cooperates with the locking post.

[0013] A water circulation device is provided below the frame. The water circulation device includes a water storage tank, a filter assembly, and a water pump. The water storage tank is installed below the frame. The frame has a through hole for water to flow into the water storage tank. The filter assembly is installed inside the water storage tank. The water pump is installed above the filter assembly and is connected to the output of the filter assembly. The output port of the water pump is provided with a water pipe.

[0014] The filtration assembly includes a filter box, a first filter tube, a second filter tube, two liquid flow monitors, and a three-way solenoid valve. The filter box is installed in a water storage tank. The first and second filter tubes are arranged side by side in the filter box. The two liquid flow monitors are respectively installed at the output ends of the first and second filter tubes and connected to each other. Two ports of the three-way solenoid valve are respectively connected to the two liquid flow monitors, and the other port is connected to the water pump. Both liquid flow monitors are connected to the three-way solenoid valve for signal transmission.

[0015] Both the first and second filter tubes are fitted with threaded tubes at their connections to the liquid flow monitor, and the liquid flow monitor is equipped with a threaded sleeve that is threadedly connected to the threaded tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention discloses an automatic grinding machine. During grinding, the clamp is first raised, and the plate is placed on the clamp and fixed. Then, the identification component illuminates the stone to identify the grinding position. When grinding is to be performed, the abutment on the opposite side of the surface to be ground is raised to abut the plate, preventing the plate from easily breaking due to vertical force during grinding. After one side is ground, the four-axis drive grinder moves to the other side, and then the abutment on the other side is raised, while the abutment on the surface to be ground is lowered to reset, realizing vertical grinding. Manual flipping is not required, thus increasing efficiency.

[0018] 2. The present invention discloses an automatic plate grinding machine. During clamping, the plate is inserted between two limiting plates and placed on the bottom cylinder lifting component. Then, multiple clamping cylinders simultaneously drive the clamping plate to adhere to the side wall of the plate, so that the plate is in a state that can slide up and down. The bottom cylinder lifting component pushes the plate upward, so that the plate is disengaged from between the two limiting plates. Then, multiple clamping cylinders simultaneously drive the clamping plate to clamp and fix the plate. The bottom cylinder lifting component resets, thus realizing automatic clamping and fixing.

[0019] 3. This invention discloses an automatic grinding machine that uses a three-way solenoid valve to control the first filter tube for filtration. Two liquid flow monitors track the water flow to determine the filtration effectiveness of the first and second filter tubes. After prolonged filtration, if the first filter tube becomes clogged, the flow rate decreases. The three-way solenoid valve then closes the pipe on the first filter tube side and opens the pipe on the second filter tube for filtration. The first filter tube is then replaced. Similarly, if the flow rate in the second filter tube decreases, the three-way solenoid valve closes the pipe on the second filter tube side and opens the pipe on the first filter tube, allowing for the replacement of the second filter tube again. This process achieves continuous replacement without stopping the machine and maintains consistent filtration effectiveness. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the grinding machine of the present invention;

[0021] Figure 2 This is a schematic diagram of the grinding machine of the present invention from another perspective;

[0022] Figure 3 This is a schematic diagram of the rising structure of the gripper of the present invention;

[0023] Figure 4 This is a schematic diagram of the rising structure of the pusher of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the four-axis driven grinder of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the clamp of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the abutment device of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the push rod of the present invention;

[0028] Figure 9 This is a schematic diagram of the supporting rod of the present invention from another perspective;

[0029] Figure 10 This is a schematic diagram of the structure of the top plate of the present invention;

[0030] Figure 11 This is a schematic diagram of the water circulation device of the present invention;

[0031] Figure 12 This is a top view of the water circulation device of the present invention.

[0032] Figure 13 This is a cross-sectional structural diagram of the filter assembly of the present invention.

[0033] The markings in the diagram are: 1. Frame; 2. Clamping assembly; 201. Fixed platform; 202. Clamper; 203. Pusher; 204. Lifter; 205. Baffle plate; 206. Support frame; 207. Bottom cylinder lifting component; 208. Clamping cylinder; 209. Limiting plate; 2010. Clamping plate; 2011. Lifting frame; 2012. Pusher rod; 2013. Drive pusher assembly; 2014. Pusher plate; 2015. Sliding groove; 2016. Slider; 2017. Locking post; 2018. Locking slot.

[0034] 3. Four-axis driven grinder; 301. First horizontal moving lead screw assembly; 302. Second horizontal moving lead screw assembly; 303. Lifting lead screw assembly; 304. Rotation assembly; 305. Grinding head;

[0035] 4. Identification components; 401. Support rod; 402. Rotary motor; 403. Equipment camera; 404. Support column; 405. Rotating mechanism;

[0036] 5. Water circulation device; 501. Water storage tank; 502. Filter assembly; 503. Water pump; 504. Water pipe; 505. Filter box; 506. First filter tube; 507. Second filter tube; 508. Liquid flow monitor; 509. Three-way solenoid valve; 5010. Threaded pipe; 5011. Threaded sleeve. Detailed Implementation

[0037] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0038] like Figures 1-13 As shown, this embodiment provides an automatic grinding machine, including a frame 1, a clamping assembly 2, a four-axis driven grinder 3, and an identification assembly 4. The clamping assembly 2 is disposed inside the frame 1, the four-axis driven grinder 3 is mounted on the frame 1, and the identification assembly 4 is mounted on one side of the frame 1 with its identification end facing the clamping assembly 2. The clamping assembly 2 includes a fixed platform 201, a clamp 202, two abutments 203, and three lifters 204. The fixed platform 201 is fixedly installed inside the frame 1, and the three lifters 204 are installed side by side below the fixed platform 201. The clamp 202 and the two abutments 203 are respectively fixedly connected to the lifting ends of the three lifters 204, and the clamp 202 is located between the two abutments 203. The fixed platform 201 is provided with a transition groove for the clamp 202 and the two abutments 203 to extend out, and the top of the clamp 202 and the two abutments 203 are provided with a baffle plate 205 adapted to the transition groove. Specifically, the lifting device 204 is a rodless cylinder. During grinding, the clamp 202 is first raised, and the board is placed on the clamp 202 for clamping and fixing. Then, the identification component 4 illuminates the stone to identify the grinding position. When grinding is to be performed, the abutment 203 opposite to the surface to be ground is raised to abut the board, preventing the board from easily breaking due to vertical force during grinding. After one side is ground, the four-axis drive grinder 3 moves to the other side, and then the abutment 203 on the other side is raised, while the abutment 203 on the surface to be ground is lowered to reset, realizing vertical grinding. Manual flipping is not required, increasing efficiency.

[0039] Furthermore, the four-axis driven grinder 3 includes a first horizontal moving screw assembly 301, a second horizontal moving screw assembly 302, a lifting screw assembly 303, a rotating assembly 304, and a grinding head 305. The first horizontal moving screw assembly 301 is mounted on the frame 1, the second horizontal moving screw assembly 302 is mounted on the drive end of the first horizontal moving screw assembly 301, the lifting screw assembly 303 is mounted on the drive end of the second horizontal moving screw assembly 302, the rotating assembly 304 is mounted on the lifting end of the lifting screw assembly 303, and the grinding head 305 is mounted on the rotating end of the rotating assembly 304. Specifically, the first horizontal moving screw assembly 301 includes a transmission motor, a slide rail, and a screw. The slide rail is fixedly mounted on the frame 1, and the rotating motor is mounted on one end of the slide rail. The screw rotates into the slide rail and is connected to the rotating motor for transmission. The second horizontal moving screw assembly 302 includes a moving motor, a guide rail, and a moving seat. The guide rail is movably mounted on the slide rail and has a slider that engages with the screw thread. The moving seat is movably placed on the guide rail, and the moving motor is on the moving seat. A rack is provided inside the guide rail, and the drive end of the moving motor has a drive gear that meshes with the rack. The lifting screw... Component 303 includes a drive motor, a lifting guide column, and a lead screw. The lifting guide column is mounted on a movable seat, and the drive motor lifts the top of the lifting guide column. The lead screw is rotatably mounted inside the lifting guide column and is connected to the drive motor. A mounting seat is slidably provided on the lifting guide column, and the mounting seat is provided with a lifting block that is threadedly connected to the lead screw. Rotating component 304 includes a rotary motor and a support plate. The rotary motor is mounted on the mounting seat, and the support plate is mounted on the mounting seat. The grinding head 305 is rotatably mounted on the support plate. A transmission belt is provided inside the support plate, and the rotary motor drives the grinding head 305 to rotate and adjust the angle through the transmission belt. The first horizontal moving screw assembly 301 and the second horizontal moving screw assembly 302 are set horizontally and vertically. The positions of the lifting screw assembly 303, the rotating assembly 304 and the grinding head 305 are adjusted by the cooperation of the first horizontal moving screw assembly 301 and the second horizontal moving screw assembly 302. Then, the lifting screw assembly 303 drives the rotating assembly 304 and the grinding head 305 to descend for grinding. When the grinding head 305 needs to be rotated to adjust its position, it can be driven and adjusted by the rotating assembly 304, which is suitable for grinding in different directions.

[0040] Furthermore, the identification component 4 includes a support rod 401, a rotary motor 402, and a device camera 403. The support rod 401 is fixedly installed on one side of the frame 1 and extends above the fixed platform 201. The rotary motor 402 is installed at one end of the support rod 401, and the device camera 403 is installed on the drive end of the rotary motor 402. A main control box connected to the device camera 403 is installed on the frame 1. Specifically, a support column 404 is installed on one side of the frame 1, and a rotating mechanism 405 is installed on the top of the support column 404. The support rod 401 is installed on the rotating mechanism 405. The rotating motor 402 drives the device camera 403 to adjust its angle to capture images of the material. The information is then transmitted to the main control box, which controls the four-axis drive grinder 3 to perform grinding. During grinding, the rotating mechanism 405 can drive the support rod 401 to swing, causing the device camera 403 to move away from the frame 1, preventing it from affecting the four-axis drive grinder 3.

[0041] Furthermore, the clamp 202 includes a support frame 206, a bottom cylinder lifting component 207, and multiple clamping cylinders 208. The support frame 206 is mounted on the lifting end of the lifter 204, and the bottom cylinder lifting component 207 is mounted on the bottom of the support frame 206. The bottom of the support frame 206 is provided with two limiting plates 209 positioned at the lifting end of the bottom cylinder lifting component 207. The distance between the two limiting plates 209 is adapted to the material. The multiple clamping cylinders 208 are divided into two groups and symmetrically installed on both sides of the frame of the support frame 206, with their clamping ends facing each other. The clamping ends of the clamping cylinders 208 are provided with clamping plates 2010, the thickness of which is less than the thickness of the plate to be ground. Specifically, the multiple clamping cylinders 208 are equidistantly arranged along the height of the support frame 206. During clamping, the plate is inserted between two limiting plates 209 and placed on the bottom cylinder lifting member 207. Then, multiple clamping cylinders 208 simultaneously drive the clamping plate 2010 to adhere to the side wall of the plate, so that the plate can slide up and down. The bottom cylinder lifting member 207 pushes the plate upward, so that the plate is separated from the two limiting plates 209. Then, multiple clamping cylinders 208 simultaneously drive the clamping plate 2010 to clamp and fix the plate. The bottom cylinder lifting member 207 resets, thus realizing automatic clamping and fixing.

[0042] Furthermore, the abutment 203 includes a lifting frame 2011, two abutment rods 2012, and two sets of drive abutment groups 2013. The lifting frame 2011 is installed on the lifting end of the lifting device 204. The two sets of drive abutment groups 2013 are symmetrically installed on both sides of the lifting frame 2011. Each drive abutment group 2013 includes two rodless cylinders, which are symmetrically arranged vertically. The two ends of the two abutment rods 2012 are respectively installed on the drive ends of the two sets of drive abutment groups 2013. Two abutment plates 2014 are detachably installed on the two abutment rods 2012, and the two abutment plates 2014 are stacked on top of each other. Specifically, the abutment rod 2012 is provided with a sliding groove 2015, and the abutment plate 2014 is provided with a slider 2016 that slides in the sliding groove 2015. The slider 2016 is elastically connected to a locking post 2017, that is, the locking post 2017 is connected to the slider 2016 by a spring. The abutment rod 2012 is provided with a locking groove 2018 that cooperates with the locking post 2017. The sliding groove 2015 is provided with an outlet for the slider 2016 to slide out. The abutment plate 2014 can be replaced according to the size of the plate to accommodate different sizes of plates. During abutment, the abutment assembly 2013 drives the two abutment plates 2014 to fit against the plate, thereby supporting the plate.

[0043] Furthermore, a water circulation device 5 is provided below the frame 1. The water circulation device 5 includes a water storage tank 501, a filter assembly 502, and a water pump 503. The water storage tank 501 is installed below the frame 1, and the frame 1 has a through hole for water to flow into the water storage tank 501. The filter assembly 502 is installed inside the water storage tank 501, and the water pump 503 is installed above the filter assembly 502 and connected to the output of the filter assembly 502. The output port of the water pump 503 is provided with a water supply pipe 504. Water enters the water storage tank 501 through the through hole for collection, then is filtered by the filter assembly 502, and then transported through the water supply pipe 504, enabling the water to be recycled.

[0044] Furthermore, the filter assembly 502 includes a filter box 505, a first filter tube 506, a second filter tube 507, two liquid flow monitors 508, and a three-way solenoid valve 509. The filter box 505 is installed inside the water storage tank 501. The first filter tube 506 and the second filter tube 507 are arranged side by side inside the filter box 505. The two liquid flow monitors 508 are respectively installed at the output ends of the first filter tube 506 and the second filter tube 507 and connected to each other. Two ports of the three-way solenoid valve 509 are respectively connected to the two liquid flow monitors 508, and the other port is connected to the water pump 503. Both liquid flow monitors 508 are connected to the three-way solenoid valve 509 for signal connection. Threaded pipes 5010 are installed at the connection points between the first filter tube 506 and the second filter tube 507 and the liquid flow monitors 508. The liquid flow monitors 508 are provided with threaded sleeves 5011 that are threadedly connected to the threaded pipes 5010. The first filter tube 506 is controlled by a three-way solenoid valve 509 for filtration. Two liquid flow monitors 508 monitor the water flow to determine the filtration effect of the first filter tube 506 and the second filter tube 507. After prolonged filtration, the first filter tube 506 becomes clogged, resulting in a decrease in flow. The three-way solenoid valve 509 then closes the pipe on the first filter tube 506 side and opens the pipe on the second filter tube 507 side for filtration. The first filter tube 506 is then replaced. When the flow in the second filter tube 507 side decreases, the three-way solenoid valve 509 closes the pipe on the second filter tube 507 side and opens the pipe on the first filter tube 506 side. The second filter tube 507 is then replaced again, thus achieving continuous replacement without shutting down the system and maintaining filtration effectiveness at all times.

[0045] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. An automatic plate grinding machine, characterized in that: The device includes a frame, a clamping assembly, a four-axis driven grinder, and an identification assembly. The clamping assembly is disposed within the frame, and the four-axis driven grinder is mounted on the frame. The identification assembly is mounted on one side of the frame, with its identification end facing the clamping assembly. The clamping assembly includes a fixed platform, a clamp, two abutments, and three lifters. The fixed platform is fixedly installed within the frame, and the three lifters are mounted side-by-side below the fixed platform. The clamp and the two abutments are fixedly connected to the lifting ends of the three lifters, with the clamp located between the two abutments. The fixed platform has a transition groove for the clamp and the two abutments to extend out, and the top of the clamp and the two abutments is provided with a baffle plate adapted to the transition groove.

2. The automatic grinding machine according to claim 1, characterized in that: The four-axis driven grinder includes a first horizontal moving screw assembly, a second horizontal moving screw assembly, a lifting screw assembly, a rotating assembly, and a grinding head. The first horizontal moving screw assembly is mounted on the frame, the second horizontal moving screw assembly is mounted on the drive end of the first horizontal moving screw assembly, the lifting screw assembly is mounted on the drive end of the second horizontal moving screw assembly, the rotating assembly is mounted on the lifting end of the lifting screw assembly, and the grinding head is mounted on the rotating end of the rotating assembly.

3. The automatic grinding machine according to claim 1, characterized in that: The identification component includes a support rod, a rotary motor, and a device camera. The support rod is fixedly installed on one side of the frame and extends above the fixed platform. The rotary motor is installed at one end of the support rod, and the device camera is installed on the drive end of the rotary motor. A main control box connected to the device camera signal is installed on the frame.

4. An automatic grinding machine according to claim 3, characterized in that: A support column is installed on one side of the frame, a rotating mechanism is installed on the top of the support column, and a support rod is installed on the rotating mechanism.

5. An automatic grinding machine according to claim 1, characterized in that: The clamping device includes a support frame, a bottom cylinder lifting component, and multiple clamping cylinders. The support frame is installed on the lifting end of the lifting device, and the bottom cylinder lifting component is installed on the bottom of the support frame. The bottom of the support frame is provided with two limiting plates placed on both sides of the lifting end of the bottom cylinder lifting component. The multiple clamping cylinders are divided into two groups and symmetrically installed on both sides of the frame inside the support frame, with their clamping ends facing each other. The clamping end of each clamping cylinder is provided with a clamping plate, and the thickness of the clamping plate is less than the thickness of the plate to be ground.

6. An automatic grinding machine according to claim 5, characterized in that: The plurality of clamping cylinders are arranged at equal intervals along the height of the support frame.

7. An automatic grinding machine according to claim 1, characterized in that: The abutment includes a lifting frame, two abutment rods, and two sets of drive abutment groups. The lifting frame is installed on the lifting end of the lifting device. The two sets of drive abutment groups are symmetrically installed on both sides of the lifting frame. The two ends of the two abutment rods are respectively installed on the drive ends of the two sets of drive abutment groups. Two abutment plates are detachably installed on the two abutment rods.

8. An automatic grinding machine according to claim 7, characterized in that: The abutting rod is provided with a sliding groove, the abutting plate is provided with a slider that is slidably placed in the sliding groove, the slider is elastically connected with a locking post, and the abutting rod is provided with a locking groove that cooperates with the locking post.

9. An automatic grinding machine according to claim 1, characterized in that: A water circulation device is provided below the frame. The water circulation device includes a water storage tank, a filter assembly, and a water pump. The water storage tank is installed below the frame. The frame has a through hole for water to flow into the water storage tank. The filter assembly is installed inside the water storage tank. The water pump is installed above the filter assembly and is connected to the output of the filter assembly. The output port of the water pump is provided with a water pipe.

10. An automatic grinding machine according to claim 9, characterized in that: The filtration assembly includes a filter box, a first filter tube, a second filter tube, two liquid flow monitors, and a three-way solenoid valve. The filter box is installed in a water storage tank. The first and second filter tubes are arranged side by side in the filter box. The two liquid flow monitors are respectively installed at the output ends of the first and second filter tubes and connected to each other. Two ports of the three-way solenoid valve are respectively connected to the two liquid flow monitors, and the other port is connected to the water pump. Both liquid flow monitors are connected to the three-way solenoid valve for signal transmission. Both the first and second filter tubes are fitted with threaded tubes at their connections to the liquid flow monitor, and the liquid flow monitor is equipped with a threaded sleeve that is threadedly connected to the threaded tube.

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