A machining center tool holder tightness detection device

Abstract

The utility model discloses a machining center tool holder tightness detection device, the through hole is set up in the inner shaft axial of main shaft, and the taper head that sets up with the inverted taper hole is matched is set up on the tool holder, and the taper head cooperation is installed in the inverted taper hole, and the top of taper head is installed with pull -out pin, and the pull -rod is sealedly installed in the step hole, and the air inlet through -hole is set up in the inner shaft of pull -rod, and the air inlet through -hole is connected with the reaming, and the bottom of pull -rod is located in the reaming, and the bottom of pull -rod is installed with the dog -claw, and the head of pull -out pin is clamped by dog -claw, and the movable sleeve is installed in the reaming, and the top of movable sleeve is slidably fitted and installed in the reaming, and the middle lower part of movable sleeve has the air inlet channel with the reaming, and the top of pull -rod still is installed with the gas supply device, and the gas supply device is connected with the air inlet through -hole. The utility model has the beneficial effects that by the high pressure gas is passed in, then through the sensor detection pressure change in the pressure chamber, can effectively detect whether the tool holder is clamped in place, whether there is loose, thereby guarantee the reliability in the processing.

Description

Technical Field

[0001] This utility model relates to the detection of tool holder tightness, and in particular to a tool holder tightness detection device for machining centers. Background Technology

[0002] Machining center spindles are equipped with broaching devices, which are widely used in machining. These devices are primarily used to secure and release tool holders, ensuring reliability, stability, and safety during machining. In practice, occasional broaching instability can cause tool vibration during machining, leading to tool damage. It can also cause abnormal contact between the tool and the machine tool, or the tool holder may break and detach during machining, resulting in damage to machine tool components and potential safety accidents. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a machining center tool holder tension detection device.

[0004] The objective of this utility model is achieved through the following technical solution: A tool holder tension detection device for a machining center includes a mounting base on which a spindle is rotatably mounted. A tool holder is mounted on the bottom of the spindle. An axial through hole is provided inside the spindle, which, from top to bottom, includes a stepped hole, a reamed hole, and an inverted conical hole. A conical head matching the inverted conical hole is provided on the tool holder. The conical head is fitted into the inverted conical hole, and a pull stud is installed on the top of the conical head. A pull rod is sealed inside the stepped hole, and an axial opening is provided inside the pull rod. It has an air intake hole that connects to the expansion hole. The pull rod is a stepped rod that is wider at the top and narrower at the bottom. The bottom of the pull rod is located inside the expansion hole, and a pawl is installed at the bottom of the pull rod. The head of the pull pin is held by the pawl. A movable sleeve is installed inside the expansion hole. The top of the movable sleeve is slidably fitted inside the expansion hole, and there is an air intake channel between the lower middle part of the movable sleeve and the expansion hole. When the movable sleeve moves upward, it squeezes the pawl and causes the pawl to retract inward. An air supply device is also installed at the top of the pull rod, and the air supply device connects to the air intake hole.

[0005] Optionally, the pawl includes a threaded sleeve, which is threaded to the bottom of the pull rod. The bottom of the threaded sleeve is provided with several downwardly extending elastic claws. The bottom outer wall of the elastic claw is an inverted conical surface, and the bottom inner wall of the elastic claw is provided with an inwardly convex part. When the movable sleeve moves upward, the movable sleeve squeezes the elastic claws to contract inward.

[0006] Optionally, the movable sleeve includes a cylindrical body with an annular groove. The cylindrical body above the annular groove forms a mating ring, which slides in conjunction with the enlarged hole. The cylindrical body below the annular groove forms a compression sleeve, and the bottom inner hole of the compression sleeve is a tapered hole that matches the inverted conical surface.

[0007] Optionally, a sealing ring is installed on the main rod of the pull rod, and a compression spring is fitted on the secondary rod of the pull rod. The bottom of the compression spring abuts against the stepped surface of the stepped hole. A cover plate is installed on the top of the mounting base. The top of the pull rod abuts against the cover plate under the elastic restoring force of the compression spring. A connecting pipe is provided on the top of the pull rod. The connecting pipe passes through the cover plate and is connected to the air supply device.

[0008] Optionally, the gas supply device includes a controller, a pressure sensor, a tee connector, and a connector. One end of the connector is connected to a connecting pipe, and the other end of the connector is connected to the tee connector via a pipe. One end of the tee connector is connected to the gas supply equipment, and the other end of the tee connector is connected to the pressure sensor via a pipe. The pressure sensor is connected to the controller via a wire, and the pressure sensor transmits the detected pressure signal to the controller. The controller is also connected to the gas supply equipment via a wire, and the controller controls the start and stop of the gas supply equipment.

[0009] Optionally, the pull stud is detachably connected to the top of the tool holder via a thread.

[0010] The present invention has the following advantages: The tool holder tightness detection device of the present invention can effectively detect whether the tool holder is properly clamped or loose by introducing high-pressure gas and then detecting the pressure change in the air pressure chamber through a sensor, thereby ensuring the reliability of the machining process. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a cross-sectional view after the gas supply device has been removed.

[0013] Figure 3 This is a schematic diagram of the chuck's structure;

[0014] Figure 4 This is a structural diagram of the removable sleeve;

[0015] Figure 5 for Figure 2 Enlarged view of point A in the middle;

[0016] In the diagram, 1-tool holder, 2-spindle, 3-pull stud, 4-movable sleeve, 5-jaw chuck, 6-air pressure chamber, 7-lifting chamber, 8-compression spring, 9-pull rod, 10-sealing ring, 11-air inlet, 12-stepped hole, 13-mounting base, 14-cover plate, 15-air inlet channel, 16-connector, 17-tee connector, 18-pressure sensor, 19-controller, 41-fitting ring, 42-annular groove, 43-extrusion sleeve, 51-threaded sleeve, 52-elastic claw, 53-conical surface, 54-inner convex part. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1and Figure 2 As shown, a machining center tool holder tension detection device includes a mounting base 13. A spindle 2 is rotatably mounted on the mounting base 13, and a tool holder 1 is mounted on the bottom of the spindle 2. In this embodiment, the spindle 2 is rotatably mounted on the mounting base 13, which is existing technology; therefore, its rotatable mounting will not be described in detail. The tool holder 1 is also a standard part, so its structure will not be elaborated further. In this embodiment, the spindle 2 has an axially formed through hole, which, from top to bottom, includes a stepped hole 12, an enlarged hole, and an inverted conical hole. The tool holder 1 has a conical head that matches the inverted conical hole. The conical head is fitted into the inverted conical hole, and a pull stud 3 is mounted on the top of the conical head. Furthermore, the pull stud 3 and the conical head... The top is connected by a thread. When the pull stud 3 is subjected to an axial upward pulling force, the tool holder 1 moves upward, thereby allowing the tapered head to engage with the inverted tapered hole, eliminating the gap between them. At this time, the tapered head closes the inverted tapered hole. A pull rod 9 is sealed and installed in the stepped hole 12. An air inlet hole 11 is axially opened in the pull rod 9, which communicates with the reaming hole. The pull rod 9 is a stepped rod that is larger at the top and smaller at the bottom. The bottom of the pull rod 9 is located in the reaming hole, and a pawl 5 is installed at the bottom of the pull rod 9. The head of the pull stud 3 is clamped by the pawl 5. In this embodiment, a sealing ring 10 is installed on the larger rod of the pull rod 9, and a compression spring 8 is fitted on the smaller rod of the pull rod 9. The bottom of the compression spring 8 is flush with the stepped surface of the stepped hole 12. The top of the mounting base 13 is fitted with a cover plate 14. The top of the pull rod 9 abuts against the cover plate 14 under the elastic restoring force of the compression spring 8. A connecting pipe is provided on the top of the pull rod 9, which passes through the cover plate 14 and is connected to the air supply device. A movable sleeve 4 is installed inside the bulging hole. The top of the movable sleeve 4 is slidably fitted inside the bulging hole, and there is an air inlet channel 15 between the lower middle part of the movable sleeve 4 and the bulging hole. When the movable sleeve 4 moves upward, it squeezes the claw 5, causing the claw 5 to retract inward. An air supply device is also installed on the top of the pull rod 9. The air supply device is connected to the air inlet hole 11. When the air supply device provides high-pressure gas, the high-pressure gas enters from the air inlet hole 11 and is discharged into the bulging hole. Inside the hole, since the top of the movable sleeve 4 is in sliding fit with the reamer, although the conical head has not yet closed the inverted conical hole, the movable sleeve 4 can still move upward under the action of high pressure gas. This causes the movable sleeve 4 to squeeze the chuck 5, and the chuck 5 to contract inward, thereby driving the pull stud 3 to move upward, which in turn causes the conical head to move upward and close the inverted conical hole. At this time, a pneumatic chamber 6 is formed inside the reamer. If the pressure in the pneumatic chamber 6 does not disappear, it indicates that the conical head and the inverted conical hole are in a closed state, that is, the tool holder 1 and the spindle 2 are properly installed. If the pressure in the pneumatic chamber 6 is constantly decreasing, it indicates that there is a gap between the conical head and the inverted conical hole. At this time, the tool holder 1 and the spindle 2 are not properly installed.

[0024] In this embodiment, as Figure 3As shown, the chuck 5 includes a threaded sleeve 51, which is threaded to the bottom of the pull rod 9. The bottom of the threaded sleeve 51 is provided with several downwardly extending elastic claws 52. The outer side wall of the bottom of the elastic claw 52 is an inverted conical surface 53, and the inner side wall of the bottom of the elastic claw 52 is provided with an inwardly protruding part 54. When the movable sleeve 4 moves upward, the movable sleeve 4 squeezes the elastic claw 52 to contract inward. When the elastic claw 52 contracts inward, the inwardly protruding part 54 squeezes inward, thereby clamping the pull stud 3 and moving the pull stud 3 upward a certain distance. Of course, after the tool holder 1 is initially installed with the spindle 2, the gap between the conical head and the inverted conical hole is very small. Therefore, the pull stud 3 only needs to move upward slightly to easily make the conical head close the inverted conical hole. Of course, in this embodiment, a conical surface is provided on the inwardly protruding part 54, and a conical surface is also provided at the step at the top of the pull stud 3. When the inwardly protruding part 54 squeezes, the pull stud 3 moves upward through the squeezing of the conical surface.

[0025] In this embodiment, as Figure 4 As shown, the movable sleeve 4 includes a cylindrical body with an annular groove 42. The cylindrical body above the annular groove 42 forms a mating ring 41, which slides in conjunction with the enlarged hole. The cylindrical body below the annular groove 42 forms a compression sleeve 43. In this embodiment, as... Figure 5As shown, the diameter of the mating ring 41 is larger than the diameter of the extrusion sleeve 43. Therefore, after the movable sleeve 4 is assembled, an air intake channel 15 will be formed between the extrusion sleeve 43 and the expansion hole, while a lifting cavity 7 will be formed between the annular groove 42 and the expansion hole. The bottom inner hole of the extrusion sleeve 43 is a tapered hole that matches the inverted conical surface 53. During assembly, the pull rod 9, which is fitted with the compression spring 8, is pressed into the stepped hole 12 from top to bottom. At this time, the compression spring 8 is in a compressed state. Then, the cover plate 14 and the mounting base 13 are locked with screws. At this time, the pull rod 9... The top of the sleeve 4 abuts against the cover plate 14 under the action of the compression spring 8, and then the pawl 5 is threadedly connected to the bottom of the pull rod 9. Then the movable sleeve 4 is inserted into the reamed hole from the inverted conical hole of the main shaft 2. In this embodiment, the small holes at the top of the inverted conical hole match the diameter of the mating ring 41, so that the movable sleeve 4 can be inserted into the reamed hole from the inverted conical hole. In actual use, since the top of the conical head protrudes from the inverted conical hole, there is no need to worry about the movable sleeve 4 falling out of the reamed hole. After the movable sleeve 4 is installed, the sleeve 4 is then inserted into the reamed hole. When the handle 1 of the pull stud 3 is inserted into the inverted conical hole, since the movable sleeve 4 does not restrict the elastic claw 52, ​​after the pull stud 3 contacts the elastic claw 52, ​​the elastic claw 52 opens outward, allowing the pull stud 3 to pass over the inner protrusion 54. After the pull stud 3 passes over the inner protrusion 54, the elastic claw 52 returns to its original position, thus providing a certain clamping effect on the pull stud 3 and preventing the handle 1 from falling off. Then, high-pressure gas is introduced. After the high-pressure gas enters the pneumatic chamber 6, it enters the lifting chamber 7 through the air inlet channel 15, thereby driving the movable sleeve 4 to lift the handle 52. As the movable sleeve 4 moves upward, the tapered hole presses against the inverted tapered surface 53, causing the elastic claw 52 to compress inward. This, in turn, drives the tool holder 1 upward, causing the tapered head to seal the inverted tapered hole. When the tool holder 1 needs to be replaced, the high-pressure gas disappears, and the movable sleeve 4 moves downward under gravity, thereby releasing the restriction of the movable sleeve 4 on the chuck 5. The elastic claw 52 resets, and the tool holder 1 moves downward a certain distance under gravity, loosening the connection between the tool holder 1 and the spindle 2. Then, by forcefully pulling down the tool holder 1, the tool holder 1 can be removed.

[0026] In this embodiment, as Figure 1 As shown, the air supply device includes a controller 19, a pressure sensor 18, a tee connector 17, and a connector 16. One end of the connector 16 is connected to a connecting pipe, and the other end of the connector 16 is connected to the tee connector 17 via a pipe. One end of the tee connector 17 is connected to the air supply equipment, and the other end of the tee connector 17 is connected to the pressure sensor 18 via a pipe. The pressure sensor 18 is connected to the controller 19 via a wire, and the pressure sensor 18 transmits the detected pressure signal to the controller 19. The controller 19 is also connected to the air supply equipment via a wire, and the controller 19 controls the start and stop of the air supply equipment. The pressure sensor 18 can detect the pressure change in the air chamber 6, and thus determine whether the tool holder 1 is loose based on the pressure change in the air chamber 6, thereby ensuring the reliable operation of the machining center.

[0027] In this embodiment, the pull stud and the top of the knife handle are detachably connected by threads, which facilitates the assembly of the pull stud and the knife handle.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tool holder tension detection device for a machining center, comprising a mounting base, wherein a spindle is rotatably mounted on the mounting base, and a tool holder is mounted on the bottom of the spindle, characterized in that: The spindle has an axially formed through hole, which includes a stepped hole, an enlarged hole, and an inverted conical hole from top to bottom. The tool holder has a conical head that matches the inverted conical hole. The conical head is fitted into the inverted conical hole, and a pull stud is installed on the top of the conical head. A pull rod is sealed in the stepped hole. An air inlet hole is formed axially in the pull rod and communicates with the enlarged hole. The pull rod is a stepped rod that is wider at the top and narrower at the bottom. The bottom of the pull rod is located in the enlarged hole, and a chuck is installed at the bottom of the pull rod. The head of the pull stud is held by the chuck. A movable sleeve is installed in the enlarged hole. The top of the movable sleeve is slidably fitted in the enlarged hole, and there is an air inlet channel between the lower middle part of the movable sleeve and the enlarged hole. When the movable sleeve moves upward, it squeezes the chuck, causing the chuck to retract inward. An air supply device is also installed on the top of the pull rod and communicates with the air inlet hole.

2. The machining center tool holder tension detection device according to claim 1, characterized in that: The pawl includes a threaded sleeve, which is threadedly connected to the bottom of the pull rod. The bottom of the threaded sleeve is provided with several downwardly extending elastic claws. The bottom outer wall of the elastic claw is an inverted conical surface, and the bottom inner wall of the elastic claw is provided with an inwardly protruding part. When the movable sleeve moves upward, the movable sleeve squeezes the elastic claws and contracts inward.

3. The machining center tool holder tension detection device according to claim 2, characterized in that: The movable sleeve includes a cylindrical body with an annular groove. The cylindrical body above the annular groove forms a mating ring, which slides in conjunction with the enlarged hole. The cylindrical body below the annular groove forms a compression sleeve, and the bottom inner hole of the compression sleeve is a tapered hole that matches the inverted tapered surface.

4. The machining center tool holder tension detection device according to claim 3, characterized in that: A sealing ring is installed on the main rod of the pull rod, and a compression spring is fitted on the secondary rod of the pull rod. The bottom of the compression spring abuts against the stepped surface of the stepped hole. A cover plate is installed on the top of the mounting base. The top of the pull rod abuts against the cover plate under the elastic restoring force of the compression spring. A connecting pipe is provided on the top of the pull rod. The connecting pipe passes through the cover plate and is connected to the air supply device.

5. The machining center tool holder tension detection device according to claim 4, characterized in that: The gas supply device includes a controller, a pressure sensor, a tee connector, and a connector. One end of the connector is connected to the connecting pipe, and the other end of the connector is connected to the tee connector via a pipe. One end of the tee connector is connected to the gas supply equipment, and the other end of the tee connector is connected to the pressure sensor via a pipe. The pressure sensor is connected to the controller via a wire, and the pressure sensor transmits the detected pressure signal to the controller. The controller is also connected to the gas supply equipment via a wire, and the controller controls the start and stop of the gas supply equipment.

6. A machining center tool holder tension detection device according to any one of claims 1 to 5, characterized in that: The pull stud is detachably connected to the top of the knife handle via a thread.

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