A long-stroke mobile positioning device for a machine tool spindle

Abstract

The present invention relates to a long-stroke mobile positioning device in a machine tool spindle, comprising a draw tube and a positioning mechanism, wherein the positioning mechanism comprises a spread sleeve, a spread block, a locking bolt and a limit assembly, wherein the outer wall diameter of the spread sleeve is smaller than the inner diameter of the draw tube, the spread block is a truncated cone that shrinks toward the spread sleeve or the inner wall of the spread sleeve is a trumpet-shaped that shrinks away from the spread block or both, and the side wall of the spread sleeve is provided with a plurality of spread grooves, and when the locking bolt is turned, the spread block is driven to reciprocate toward the spread sleeve, and the limit assembly limits the relative rotation between the spread sleeve and the draw tube. The present invention provides a mobile positioning device in a machine tool spindle that is convenient for positioning a workpiece to be processed and has a long positioning stroke range.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, in particular to a long-stroke mobile positioning device within a main shaft of a machine tool. Background Art

[0002] Machine tools refer to machines used to manufacture machines, also known as machine tools or machine tools, and are usually referred to as machine tools. They are generally divided into metal cutting machine tools, forging machine tools, and woodworking machine tools. There are many methods for processing mechanical parts in modern machinery manufacturing. In addition to cutting, there are also casting, forging, welding, stamping, extrusion, etc. However, all parts with high precision requirements and fine surface roughness requirements generally need to be finally processed on machine tools by cutting methods. Machine tools play a major role in the construction of national economic modernization.

[0003] When a machine tool is processing a workpiece, it is usually necessary to position the workpiece being processed. Usually, several holes are processed at different distances on the pull tube behind the machine tool chuck, and then bolts and other positioning parts are screwed in at the required positions. When the processed part is inserted, it will hit the positioning part, thus completing the positioning. However, this positioning method has no way to fine-tune the distance. One adjustment will move the distance corresponding to the spacing between the two holes, which is not easy to adjust. In addition, the pull tube is located inside the machine tool, and it is very troublesome to replace the position of the positioning part. Summary of the invention

[0004] In summary, in order to overcome the deficiencies of the prior art, the present invention provides a mobile positioning device in a machine tool spindle that is convenient for positioning a workpiece being processed and has a long positioning stroke range.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a long-stroke mobile positioning device in a machine tool spindle, comprising a pull tube and a positioning mechanism, wherein the positioning mechanism comprises an expansion sleeve, an expansion block, a locking bolt and a limit assembly, the outer wall diameter of the expansion sleeve is smaller than the inner diameter of the pull tube, the expansion block is a truncated cone that shrinks toward the expansion sleeve or the inner wall of the expansion sleeve is a trumpet-shaped that shrinks away from the expansion block, or both, a plurality of expansion grooves are provided on the side wall of the expansion sleeve, and when the locking bolt is turned, the expansion block is driven to reciprocate toward the expansion sleeve, and the limit assembly limits the relative rotation between the expansion sleeve and the pull tube.

[0006] With such arrangement, a threaded hole can be arranged on the expansion sleeve, and a through hole can be arranged on the expansion block. When in use, the positioning mechanism will be located in the draw tube. When positioning is required, a hexagonal wrench or a screwdriver is inserted into the locking bolt from the hole in the center of the chuck, and the locking bolt is moved to a suitable position. Then, the locking bolt is turned. Since the limit assembly limits the relative rotation between the expansion sleeve and the draw tube, the locking bolt will be continuously screwed into the threaded hole when the locking bolt is turned, and the expansion block will also continuously move toward the expansion sleeve. When moving, the truncated cone-shaped outer wall of the expansion block will support the flared inner wall of the expansion sleeve. Since a plurality of expansion grooves are arranged on the outer wall of the expansion sleeve, the expansion block can be moved. When the expansion sleeve is expanded, the outer wall diameter becomes larger until it presses against the inner wall of the pull tube and locks into position. When the workpiece is inserted into the chuck, the workpiece presses against the expansion block to complete the positioning. When adjustment is required, the hexagonal wrench or screwdriver can be inserted into the locking bolt through the hole in the center of the chuck again to push out the locking bolt. At this time, the expansion block will be pushed out by the trumpet-shaped inner wall, and the outer wall diameter of the expansion sleeve is restored. The positioning mechanism can slide in the pull tube again, and when it slides to the required position, it can be tightened again to complete the secondary positioning. The operation is convenient, and the moving distance of the positioning mechanism is easy to adjust.

[0007] Furthermore, the positioning mechanism also includes a positioning bolt, the expansion block is provided with a positioning hole adapted to the positioning bolt, and the bottom of the expansion sleeve is provided with a positioning threaded hole adapted to the positioning bolt.

[0008] With such an arrangement, during installation, the positioning bolt is first inserted into the positioning hole and then screwed into the positioning threaded hole, so that the support block and the support sleeve can be connected. In this way, the support block and the support sleeve have two connection points, the positioning bolt and the locking bolt, which can limit the relative rotation of the two, making it more stable. In addition, multiple positioning bolts can be set, and the cooperation of multiple positioning points is more stable.

[0009] Furthermore, the limiting assembly is a bolt, the outer wall of the support block is provided with a limiting threaded hole adapted to the limiting assembly, the pull tube is provided with a strip groove whose width is greater than the diameter of the limiting assembly, and the length direction of the strip groove is the same as the axial direction of the pull tube.

[0010] With such an arrangement, during installation, the positioning mechanism can be first inserted into the pull tube, and then the limiting threaded hole on the outer wall of the expansion block can be rotated to the position of the strip groove, and then the limiting assembly with the selected bolt can be screwed in. At this time, the bolt will be stuck in the strip groove, and the expansion block will not be able to make circumferential rotation in the pull tube. The strip groove can also prevent the limiting mechanism from falling out, and the relative rotation between the expansion sleeve and the expansion block is limited by the positioning bolt. In this way, the limiting assembly can not only limit the relative rotation between the expansion block and the pull tube, but also limit the relative rotation between the expansion sleeve and the pull tube. The structure is simple and the installation is convenient.

[0011] Furthermore, a reset piece is provided between the expansion sleeve and the expansion block.

[0012] With such arrangement, when the locking bolt is screwed out, the expansion block will not only be squeezed by the restoring force of the deformed trumpet-shaped inner wall, but will also be ejected by the restoring force of the reset member, thereby reducing the possibility of the expansion block being stuck when the locking bolt is screwed out. The reset member can be a spring sleeve arranged outside the locking bolt.

[0013] Furthermore, an expansion back sleeve is provided on the side of the expansion sleeve facing the pull tube, and the expansion back sleeve is symmetrically arranged with the expansion sleeve. The expansion block includes an expansion main block and an expansion auxiliary block, and the expansion main block and the expansion auxiliary block are respectively located at the positions of the expansion sleeve and the expansion back sleeve. The expansion main block sleeve is provided with a connecting hole adapted to the locking bolt, the locking bolt is arranged through the expansion sleeve, and the expansion auxiliary block is provided with a locking threaded hole adapted to the locking bolt.

[0014] With such arrangement, the locking bolt will pass through the connecting holes on the main expansion block and the expansion sleeve and be connected with the locking threaded hole on the expansion auxiliary block. When the locking bolt is turned, the main expansion block and the expansion auxiliary block will be pulled closer to each other, that is, they will move toward the inside of the expansion sleeve at the same time. The expansion sleeve will be expanded by the main expansion block, and the expansion back sleeve will be expanded by the expansion auxiliary block. In this way, the expansion sleeve will have two supporting points in the pull tube, which is more stable.

[0015] Furthermore, the main support block is provided with a first limiting hole arranged toward the support sleeve, the first limiting hole is provided with a limiting bolt adapted thereto, the support sleeve is provided with a connecting bolt hole adapted thereto, there is a gap between the bolt head of the limiting bolt and the end face of the main support block, a positioning hole is provided on the side of the connecting hole at the main support block facing away from the support sleeve, and a clamp is embedded in the inner wall of the positioning hole.

[0016] With such arrangement, when the locking bolt is unscrewed, the locking bolt will be screwed out from the expansion sub-block. At this time, the bolt head of the locking bolt will first move in the positioning hole until it hits the clamp embedded in the inner wall of the positioning hole. At this time, the expansion main block will be pushed to slide out of the expansion sleeve first. After sliding out a certain distance, the end face of the expansion main block will hit the bolt head of the limit bolt. At this time, the distance between the expansion main block and the expansion sleeve cannot be further increased. At this time, if the locking bolt is continued to be screwed out, the expansion sub-block in the expansion back sleeve will be pushed out. In this way, all the expansion blocks on both sides are successfully supported without getting stuck on one side. The operation is convenient and the structure is simple.

[0017] Furthermore, a limiting column screwed with the supporting auxiliary block is provided on the side of the supporting auxiliary block facing the supporting main block, the supporting sleeve is provided with a second limiting hole adapted to the limiting column, the outer wall of the limiting column is provided with a limiting plate with a diameter larger than the second limiting hole, the limiting plate is located on the side of the second limiting hole facing the supporting main block, and there is a gap between the limiting plate and the second limiting hole.

[0018] With such arrangement, when the locking bolt is unscrewed, the locking bolt first presses the clamp to push the locking main block to the position of the bolt head of the limit bolt, and then the support sub-block is screwed out. When the locking bolt rotates, the limit column on the support sub-block will be inserted into the second limit hole, and no relative rotation will occur. When the support sub-block is screwed out, the limit plate on the outer wall of the limit column will also move toward the second limit hole at the same time until the end face of the second limit hole is supported. At this time, the position of the support sub-block will also be supported and it will not be screwed out further, avoiding the situation where the support sub-block is over-screwed and falls out.

[0019] Furthermore, a sliding hole adapted to the limit column is provided at a position of the main support block corresponding to the limit column.

[0020] With such arrangement, the limiting column will be inserted into the sliding hole to limit the sliding of the main support block, and the limiting column and the sliding hole can cooperate to limit the circumferential rotation of the main support block, making the positioning device more stable.

[0021] Furthermore, a positioning column is provided on the side of the supporting auxiliary block facing the supporting main block, the locking threaded hole is located on the top surface of the positioning column, the supporting sleeve is provided with a column hole adapted to the positioning column, and the supporting main block is provided with a column groove adapted to the positioning column.

[0022] With such a configuration, the positioning column will pass through the column hole and be inserted into the column groove. The cooperation between the column groove and the positioning column can make the two more stable during the process of inserting or removing the expansion sleeve. The locking threaded hole is arranged on the top surface of the positioning column, which can increase the thread length of the locking threaded hole and reduce the distance between the thread and the end face of the expansion main block. The required length of the locking bolt is shorter and it is easier to adapt.

[0023] Furthermore, the limiting assembly is a bolt, the outer wall of the expansion block or the outer wall of the expansion sleeve is provided with a limiting threaded hole adapted to the limiting assembly, the inner wall of the pull tube is provided with a groove with a width greater than the diameter of the limiting assembly, and the groove passes through both side end surfaces of the pull tube.

[0024] With such an arrangement, when installing, the limit assembly of the selected bolt is screwed in, and then the bolt of the positioning mechanism is aligned with the groove and inserted into the pull tube. At this time, the bolt will be stuck in the groove, and the expansion block will not be able to make circumferential rotation in the pull tube, and the relative rotation between the expansion sleeve and the expansion block is limited by the positioning bolt. In this way, the limit assembly can not only limit the relative rotation between the expansion block and the pull tube, but also limit the relative rotation between the expansion sleeve and the pull tube. When the positioning mechanism is used, the pull tube is not easily expanded from the groove position. The structure is simple and easy to install. When the positioning device is a structure with two ends expanded, the limit threaded hole can be set in the center of the expansion sleeve, and the force is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0026] Figure 2 This is an exploded view of Example 1 of the present invention.

[0027] Figure 3 It is an exploded view of the positioning mechanism of Example 1 of the present invention.

[0028] Figure 4 This is a front cross-sectional view of the positioning mechanism of Example 1 of the present invention.

[0029] Figure 5 This is an exploded view of the positioning mechanism without locking bolts according to Example 2 of the present invention.

[0030] Figure 6 It is a partial cross-sectional view of the front view of the drawn tube of Example 2 of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the drawn tube according to Example 2 of the present invention.

[0032] Meaning of the numbers in the figure: 1. Pull tube, 101. Strip groove, 102. Groove, 2. Positioning mechanism, 201. Open sleeve, 2011. Open groove, 2013. Positioning threaded hole, 2014. Reset member, 2015. Open back sleeve, 2017. Connecting bolt hole, 2018. Second limiting hole, 2019. Column hole, 202. Open block, 2022. Limiting threaded hole, 2023. Positioning hole, 2024. Bolt head groove, 2025. Open main block, 20251. First limiting hole, 2 0252. Limit bolt, 20253. Connecting hole, 20254. Positioning hole, 20255. Clamp, 20256. Column groove, 20257. Sliding hole, 2026. Spreading auxiliary block, 20261. Locking threaded hole, 20262. Limit column, 202621. Limit plate, 20263. Positioning column, 203. Locking bolt, 204. Positioning bolt, 205. Limit assembly, 206. Positioning stud, 207. Adjustment piece, 2071. Adjustment hole, 2072. Positioning block. DETAILED DESCRIPTION

[0033] This specific embodiment is merely an explanation of this embodiment and is not a limitation of this embodiment. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of this embodiment, they are protected by patent law.

[0034] See attached Figure 1-4The present invention provides the following technical solution: a long-stroke mobile positioning device within a machine tool spindle, comprising a draw tube 1 and a positioning mechanism 2, wherein the positioning mechanism 2 comprises a spreading sleeve 201, a spreading block 202, a locking bolt 203 and a limiting assembly 205, wherein the outer wall diameter of the spreading sleeve 201 is smaller than the inner diameter of the draw tube 1, the spreading block 202 is a truncated cone that shrinks toward the spreading sleeve 201, or the inner wall of the spreading sleeve 201 is a trumpet-shaped that shrinks away from the spreading block 202, or both, and a plurality of spreading grooves 2011 are provided on the side wall of the spreading sleeve 201, and when the locking bolt 203 is turned, the spreading block 202 is driven to reciprocate toward the spreading sleeve 201, and the limiting assembly 205 limits the relative rotation between the spreading sleeve 201 and the draw tube 1.

[0035] With such arrangement, a threaded hole can be provided on the expansion sleeve 201, and a through hole can be provided on the expansion block 202. When in use, the positioning mechanism 2 will be located in the pull tube 1. When positioning is required, a hexagonal wrench or a screwdriver is inserted into the locking bolt 203 from the hole in the center of the chuck, and it is moved to a suitable position, and then the locking bolt 203 is turned. Since the limit assembly 205 limits the relative rotation between the expansion sleeve 201 and the pull tube 1, when the locking bolt 203 is turned, the locking bolt 203 will be continuously screwed into the threaded hole, and the expansion block 202 will also continuously move toward the expansion sleeve 201. When moving, the truncated cone-shaped outer wall of the expansion block 202 will support the trumpet-shaped inner wall of the expansion sleeve 201. Since the outer wall of the expansion sleeve 201 is provided with A plurality of expansion grooves 2011 are provided. When the expansion sleeve 201 is moved, it will be expanded outward, causing the outer wall diameter to increase until it presses against the inner wall of the pull tube 1 and is locked in position. At this time, after the processed part is inserted into the chuck, the processed part will press against the expansion block 202 to complete the positioning. When adjustment is needed, the hexagonal wrench or screwdriver can be inserted into the locking bolt 203 from the hole in the center of the chuck again to push out the locking bolt 203. At this time, the expansion block 202 will be pushed out by the trumpet-shaped inner wall, and the outer wall diameter of the expansion sleeve 201 will be restored. The positioning mechanism 2 can slide in the pull tube 1 again, and when it slides to the required position, it can be tightened again to complete the secondary positioning. The operation is convenient, and the moving distance of the positioning mechanism 2 is easy to adjust.

[0036] Preferably, in this embodiment, the positioning mechanism 2 further comprises a positioning bolt 204 , the expansion block 202 is provided with a positioning hole 2023 adapted to the positioning bolt 204 , and the bottom of the expansion sleeve 201 is provided with a positioning threaded hole 2013 adapted to the positioning bolt 204 .

[0037] With such arrangement, during installation, the positioning bolt 204 is first inserted into the positioning hole 2023 and then screwed into the positioning threaded hole 2013, so that the expansion block 202 and the expansion sleeve 201 can be connected. In this way, the expansion block 202 and the expansion sleeve 201 have two connection points, namely the positioning bolt 204 and the locking bolt 203, which can limit the relative rotation between the two and are more stable. In addition, multiple positioning bolts 204 can be provided, and the cooperation of multiple positioning points is more stable.

[0038] In this embodiment, preferably, the limiting component 205 is a bolt, the outer wall of the support block 202 is provided with a limiting threaded hole 2022 adapted to the limiting component 205, and the pull tube 1 is provided with a strip groove 101 with a width greater than the diameter of the limiting component 205, and the length direction of the strip groove 101 is the same as the axial direction of the pull tube 1. The above setting is not limiting, and the strip groove 101 can also be made into a three-section type, and the inner wall between the two sections of the strip groove 101 is provided with a groove.

[0039] With such arrangement, during installation, the positioning mechanism 2 can be first inserted into the pull tube 1, and then the limiting threaded hole 2022 on the outer wall of the expansion block 202 can be rotated to the position of the strip groove 101, and then the limiting assembly 205 with the selected bolt can be screwed in. At this time, the bolt will be stuck in the strip groove 101, and the expansion block 202 will not be able to make circumferential rotation in the pull tube 1. The strip groove 101 can also prevent the limiting mechanism from falling out, and the relative rotation between the expansion sleeve 201 and the expansion block 202 is limited by the positioning bolt 204. In this way, the limiting assembly 205 can not only limit the relative rotation between the expansion block 202 and the pull tube 1, but also limit the relative rotation between the expansion sleeve 201 and the pull tube 1. The structure is simple and the installation is convenient.

[0040] Preferably, in this embodiment, a reset member 2014 is provided between the expansion sleeve 201 and the expansion block 202 .

[0041] With such arrangement, when the locking bolt 203 is screwed out, the expansion block 202 will not only be squeezed by the restoring force of the deformed trumpet-shaped inner wall, but will also be ejected by the restoring force of the reset member 2014, thereby reducing the possibility of the expansion block 202 being stuck when the locking bolt 203 is screwed out. The reset member 2014 can be a spring sleeve arranged outside the locking bolt 203.

[0042] Preferably, in this embodiment, the end of the expansion block 202 facing away from the expansion sleeve 201 is provided with a bolt head groove 2024 whose diameter matches the diameter of the bolt head of the locking bolt 203 .

[0043] With such arrangement, the bolt head of the locking bolt 203 will be located in the bolt head groove 2024, and the workpiece being processed will only press against the end surface of the support block 202 but will not press against the bolt head.

[0044] Preferably, in this embodiment, the positioning mechanism 2 further includes a positioning stud 206 , the depth of the bolt head groove 2024 is greater than the height of the bolt head of the locking bolt 203 , and the inner wall of the bolt head groove 2024 is threadedly connected to the positioning stud 206 .

[0045] In this arrangement, due to the provision of the strip groove 101, the positioning mechanism 2 cannot be positioned at the position between the strip groove 101 and the end face of the pull tube 1, so that a shorter workpiece cannot be positioned. At this time, the positioning stud 206 can be screwed into the bolt head, and the length of the positioning mechanism 2 is increased so that the positioning bolt 204 can support the workpiece at the position between the strip groove 101 and the end face of the pull tube 1, which is more practical.

[0046] Preferably, in this embodiment, the positioning mechanism 2 further comprises an adjusting member 207 , the adjusting member 207 is provided with an adjusting hole 2071 threadedly connected to the positioning stud 206 , and the outer wall of the adjusting member 207 is provided with a plurality of positioning blocks 2072 .

[0047] With such arrangement, the adjusting member 207 can be screwed onto the positioning stud 206, and the positioning blocks 2072 on the outer wall of the adjusting member 207 can play a supporting role. In this way, when the processed part is a pipe fitting, the positioning screw can also play a supporting role, and fine-tuning can be performed by rotating the adjusting member 207, which is more practical.

[0048] Preferably, in this embodiment, an expansion back sleeve 2015 is provided on the side of the expansion sleeve 201 facing the pull tube 1, and the expansion back sleeve 2015 is symmetrically arranged with the expansion sleeve 201, and the expansion block 202 includes an expansion main block 2025 and an expansion sub-block 2026, and the expansion main block 2025 and the expansion sub-block 2026 are respectively located at the positions of the expansion sleeve 201 and the expansion back sleeve 2015, and the expansion main block 2025 is provided with a connecting hole 20253 adapted to the locking bolt 203, and the locking bolt 203 is arranged through the expansion sleeve 201, and the expansion sub-block 2026 is provided with a locking threaded hole 20261 adapted to the locking bolt 203.

[0049] With such arrangement, the locking bolt 203 will pass through the connecting holes 20253 on the main expansion block 2025 and the expansion sleeve 201 and be connected with the locking threaded hole 20261 on the expansion sub-block 2026. When the locking bolt 203 is turned, the main expansion block 2025 and the expansion sub-block 2026 will be pulled closer to each other, that is, they will move toward the inside of the expansion sleeve 201 at the same time. The expansion sleeve 201 will be expanded by the main expansion block 2025, and the expansion back sleeve 2015 will be expanded by the expansion sub-block 2026. In this way, the expansion sleeve 201 will have two supporting points in the pull tube 1, which is more stable.

[0050] See attached Figure 5-7In this embodiment, preferably, the main expansion block 2025 is provided with a first limiting hole 20251 arranged toward the expansion sleeve 201, the first limiting hole 20251 is provided with a limiting bolt 20252 adapted thereto, the expansion sleeve 201 is provided with a connecting bolt hole 2017 adapted thereto, there is a gap between the bolt head of the limiting bolt 20252 and the end face of the main expansion block 2025, the connecting hole 20253 at the main expansion block 2025 is provided with a locking hole 20254 on the side facing away from the expansion sleeve 201, the inner wall of the locking hole 20254 is embedded with a clamp 20255, the above setting is not limiting, the connecting bolt hole 2017 can be a through hole or a blind hole.

[0051] With such arrangement, when the locking bolt 203 is unscrewed, the locking bolt 203 will be screwed out from the expansion auxiliary block 2026. At this time, the bolt head of the locking bolt 203 will first move in the positioning hole 20254 until it hits the clamp 20255 embedded in the inner wall of the positioning hole 20254. At this time, the expansion main block 2025 will be pushed to slide out of the expansion sleeve 201 first. After sliding out a certain distance, the end face of the expansion main block 2025 will hit the bolt head of the limiting bolt 20252. At this time, the distance between the expansion main block 2025 and the expansion sleeve 201 cannot be further increased. At this time, if the locking bolt 203 is continued to be screwed out, the expansion auxiliary block 2026 in the expansion back sleeve 2015 will be pushed out. In this way, the expansion blocks 202 on both sides are successfully supported, and there will be no unilateral jamming. The operation is convenient and the structure is simple.

[0052] Preferably, in this embodiment, a limiting column 20262 threadedly engaged with the supporting auxiliary block 2026 is provided on the side of the supporting auxiliary block 2026 facing the supporting main block 2025, the supporting sleeve 201 is provided with a second limiting hole 2018 adapted to the limiting column 20262, and a limiting plate 202621 having a diameter greater than the second limiting hole 2018 is provided on the outer wall of the limiting column 20262, the limiting plate 202621 is located at the second limiting hole 2018 facing the supporting main block On one side of 2025, there is a gap between the limit plate 202621 and the second limit hole 2018. The above setting is not limiting. The limit column 20262 and the support sub-block 2026 can also be connected by welding, riveting, gluing, etc. Three limit columns 20262 can be provided, which are arranged around the support sub-block 2026. One end of the limit column 20262 can also be provided with a straight groove or a cross groove for easy twisting with a screwdriver. The second limit hole can also be provided in a groove adapted to the limit plate.

[0053] With such arrangement, when unscrewing the locking bolt 203, the locking bolt 203 first pushes the clamp 20255 to push the locking main block to the position of the bolt head of the limiting bolt 20252, and then the supporting sub-block 2026 is screwed out. When the locking bolt 203 rotates, the limiting column 20262 on the supporting sub-block 2026 will be inserted into the second limiting hole 2018, and no relative rotation will occur. When the supporting sub-block 2026 is screwed out, the limiting plate 202621 on the outer wall of the limiting column 20262 will also move toward the second limiting hole 2018 at the same time until the end face of the second limiting hole 2018 is supported. At this time, the position of the supporting sub-block 2026 will also be supported and will not continue to be screwed out, thereby avoiding the situation where the supporting sub-block 2026 is screwed too much and falls out.

[0054] Preferably, in this embodiment, the main support block 2025 is provided with a sliding hole 20257 adapted to the position of the limiting column 20262 corresponding to the limiting column 20262.

[0055] With such arrangement, the limiting column 20262 will be inserted into the sliding hole 20257 to limit the sliding of the main support block 2025, and the limiting column 20262 and the sliding hole 20257 can cooperate to limit the circumferential rotation of the main support block 2025, making the positioning device more stable.

[0056] Preferably in this embodiment, a positioning column 20263 is provided on the side of the supporting sub-block 2026 facing the supporting main block 2025, the locking threaded hole 20261 is located on the top surface of the positioning column 20263, the supporting sleeve 201 is provided with a column hole 2019 adapted to the positioning column 20263, and the supporting main block 2025 is provided with a column groove 20256 adapted to the positioning column 20263.

[0057] With such a configuration, the positioning column 20263 will pass through the column hole 2019 and be inserted into the column groove 20256. The cooperation between the column groove 20256 and the positioning column 20263 can make the two more stable during the process of inserting or removing the expansion sleeve 201, and the locking threaded hole 20261 is arranged on the top surface of the positioning column 20263, which can increase the thread length of the locking threaded hole 20261 and reduce the distance between the thread and the end face of the expansion main block 2025. The required length of the locking bolt 203 is shorter and easier to adapt.

[0058] Preferably, in this embodiment, the limiting component 205 is a bolt, the outer wall of the expansion block 202 or the outer wall of the expansion sleeve 201 is provided with a limiting threaded hole 2022 adapted to the limiting component 205, and the inner wall of the pull tube 1 is provided with a groove 102 with a width greater than the diameter of the limiting component 205, and the groove 102 passes through the two side end surfaces of the pull tube 1.

[0059] With such arrangement, during installation, the limiting assembly 205 of the selected bolt is screwed in, and then the bolt of the positioning mechanism 2 is aligned with the groove 102 and inserted into the pull tube 1. At this time, the bolt will be stuck in the groove 102, and the expansion block 202 will not be able to make circumferential rotation in the pull tube 1, and the relative rotation between the expansion sleeve 201 and the expansion block 202 is limited by the positioning bolt 204. In this way, the limiting assembly 205 can not only limit the relative rotation between the expansion block 202 and the pull tube 1, but also limit the relative rotation between the expansion sleeve 201 and the pull tube 1. When the positioning mechanism 2 is in use, the pull tube 1 is not easily expanded from the groove 102 position. The structure is simple and the installation is convenient. When the positioning device is a structure with expansion at both ends, the limiting threaded hole 2022 can be set at the center of the expansion sleeve 201, and the force is more uniform.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A long-stroke mobile positioning device in a machine tool spindle, comprising a draw tube, characterized in that: The invention also comprises a positioning mechanism, wherein the positioning mechanism comprises an expansion sleeve, an expansion block, a locking bolt and a limiting assembly, the outer wall diameter of the expansion sleeve is smaller than the inner diameter of the pull tube, the expansion block is a truncated cone shape which shrinks toward the expansion sleeve or the inner wall of the expansion sleeve is a trumpet shape which shrinks away from the expansion block or both, the side wall of the expansion sleeve is provided with a plurality of expansion grooves, and when the locking bolt is turned, the expansion block is driven to reciprocate toward the expansion sleeve, and the limiting assembly limits the relative rotation between the expansion sleeve and the pull tube; an expansion back sleeve is provided on the side of the expansion sleeve facing the pull tube, and the expansion back sleeve is symmetrically arranged with the expansion sleeve, the expansion block comprises an expansion main block and an expansion auxiliary block, the expansion main block and the expansion auxiliary block are respectively located at the positions of the expansion sleeve and the expansion back sleeve, the expansion main block sleeve is provided with a connecting hole adapted to the locking bolt, the locking bolt is arranged through the expansion sleeve, and the expansion auxiliary block is provided with a locking threaded hole adapted to the locking bolt.

2. The long-stroke mobile positioning device for a machine tool spindle according to claim 1, characterized in that: The positioning mechanism also includes a positioning bolt, the expansion block is provided with a positioning hole adapted to the positioning bolt, and the bottom of the expansion sleeve is provided with a positioning threaded hole adapted to the positioning bolt.

3. The long-stroke mobile positioning device for a machine tool spindle according to claim 1, characterized in that: The limiting assembly is a bolt, the outer wall of the support block is provided with a limiting threaded hole adapted to the limiting assembly, the pull tube is provided with a strip groove with a width greater than the diameter of the limiting assembly, and the length direction of the strip groove is the same as the axial direction of the pull tube.

4. The long-stroke mobile positioning device for a machine tool spindle according to claim 1, characterized in that: A reset piece is arranged between the expansion sleeve and the expansion block.

5. The long-stroke mobile positioning device for a machine tool spindle according to claim 1, characterized in that: The main expansion block is provided with a first limiting hole arranged toward the expansion sleeve, the first limiting hole is provided with a limiting bolt matched therewith, the expansion sleeve is provided with a connecting bolt hole matched with the limiting bolt, there is a gap between the bolt head of the limiting bolt and the end face of the main expansion block, the connecting hole at the main expansion block is provided with a locking hole on the side facing away from the expansion sleeve, and a clamp is embedded in the inner wall of the locking hole.

6. The long-stroke mobile positioning device for a machine tool spindle according to claim 5, characterized in that: A limiting column screwed with the supporting auxiliary block is provided on the side of the supporting auxiliary block facing the supporting main block, the supporting sleeve is provided with a second limiting hole adapted to the limiting column, the outer wall of the limiting column is provided with a limiting plate with a diameter larger than the second limiting hole, the limiting plate is located on the side of the second limiting hole facing the supporting main block, and there is a gap between the limiting plate and the second limiting hole.

7. The long-stroke mobile positioning device for a machine tool spindle according to claim 6, characterized in that: The position of the main support block corresponding to the limit column is provided with a sliding hole adapted thereto.

8. The long-stroke mobile positioning device for a machine tool spindle according to claim 5, characterized in that: A positioning column is provided on the side of the supporting auxiliary block facing the supporting main block, the locking threaded hole is located on the top surface of the positioning column, the supporting sleeve is provided with a column hole adapted to the positioning column, and the supporting main block is provided with a column groove adapted to the positioning column.

9. The long-stroke mobile positioning device for a machine tool spindle according to claim 1, characterized in that: The limiting component is a bolt, the outer wall of the expansion block or the outer wall of the expansion sleeve is provided with a limiting threaded hole adapted to the limiting component, the inner wall of the pull tube is provided with a groove with a width greater than the diameter of the limiting component, and the groove passes through the two side end surfaces of the pull tube.

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