A positioning cone air blowing device for an exchange workbench

Abstract

This invention relates to the field of exchange workbench technology, and more particularly to a positioning cone air blowing device for an exchange workbench, installed on a rotary table. It includes an air supply unit, an air distribution unit, and multiple sets of air blowing units. The air supply unit provides compressed air; the air distribution unit includes multiple air distribution blocks, each connected to the air supply unit; the multiple sets of air blowing units are arranged one-to-one with multiple positioning cones on the rotary table, each set of air blowing units connected to the same air distribution block; each set of air blowing units includes at least two air blowing pipes installed face-to-face, one air blowing pipe facing one side of the circumferential cone's conical surface, and the other air blowing pipe facing the opposite side of the circumferential cone's conical surface; the air supply unit continuously supplies air to each air distribution block, and the gas, after being distributed by the air distribution block, is ejected from the nozzles of the two air blowing pipes. The ejected airflow converges at the conical surface to form an air curtain, which can completely cover the conical surface of the positioning cone, blocking contact between iron filings and the conical surface from the source, ensuring the positioning accuracy and repeatability of the exchange workbench.

Description

Technical Field

[0001] This invention relates to the field of exchange workbench technology, and more particularly to a positioning cone air blowing device for exchange workbench. Background Technology

[0002] To improve the processing efficiency of machining centers, the industry typically equips machine tools with automatically interchangeable worktables to achieve simultaneous cutting and workpiece loading / unloading. In this process, the positioning accuracy and repeatability of the interchangeable worktable directly determine the machining accuracy; therefore, ensuring the stability of these two accuracies becomes a key technical issue in machine tool design and application.

[0003] Currently, exchange worktables generally use a combination of locating pins and locating sleeves for positioning. This method can completely restrict the degrees of freedom of the worktable, ensuring accurate and reliable positioning. However, when the exchange mechanism completes a 180° rotation exchange, residual machining chips on the exchange worktable are prone to falling onto the conical surface of the locating cones. If the chips are not cleaned in time, they can become stuck when the upper and lower locating cones are locked, causing the exchange worktable to become misaligned. This severely affects the positioning accuracy of the worktable, leading to an increase in the scrap rate.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a positioning cone blowing device for an exchange worktable to solve the problems of insufficient positioning accuracy and high scrap rate of the exchange worktable caused by iron filings getting stuck in the positioning cone.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A positioning cone air blowing device for an exchange workbench, mounted on a rotary table, includes:

[0008] The air supply unit is used to provide compressed air.

[0009] The gas distribution unit includes multiple gas distribution blocks, and each gas distribution block is connected to the gas supply unit.

[0010] Multiple sets of air blowing units are set one-to-one with multiple positioning cones on the rotary table, and each set of air blowing units is connected to the same air distribution block.

[0011] Each of the air blowing units includes at least two air blowing pipes installed face to face, one of which faces the conical surface of the positioning cone on one side of the circumference and the other air blowing pipe faces the conical surface of the positioning cone on the opposite side of the circumference.

[0012] The gas supply unit continuously supplies gas to each of the gas distribution blocks. After being distributed by the gas distribution blocks, the gas is ejected from the openings of the two air blowing pipes of each group of air blowing units. The ejected airflows converge on the conical surface to form an air curtain wall.

[0013] Furthermore, each of the gas distribution blocks has at least one gas distribution chamber inside;

[0014] The air distribution chamber is provided with a main air path and two air distribution paths that are connected to each other. The main air path is connected to the air supply unit, and the two air distribution paths are respectively connected to the two air blowing pipes of the same group of air blowing units.

[0015] Furthermore, the air supply unit includes at least one air supply passage disposed on the central oil distribution shaft inside the rotary table;

[0016] The air inlet of the air supply passage is connected to an external air source through a rotary air connector, and the air outlet is connected to multiple air distribution blocks in the air distribution unit through connecting air pipes, so as to realize the synchronous air supply of multiple air distribution blocks.

[0017] Furthermore, the two air-blowing pipes in the air-blowing unit are symmetrically arranged on both sides of the positioning cone, and the outlet ends of the two air-blowing pipes are horizontally arranged.

[0018] Furthermore, the air blowing pipe has a U-shaped curved structure, and the opening directions of the two air blowing pipes are arranged opposite to each other;

[0019] The air blowing pipe is installed on the air distribution block at one end of the air inlet, and the air outlet is set facing the generatrix of the positioning cone at the other end.

[0020] Furthermore, the air outlet of the air blowing pipe is located below the contact area between the positioning cone and the positioning sleeve;

[0021] The outlet end of the air blowing pipe is provided with a beveled guide surface, which is parallel to the extension direction of the generatrix of the cone surface, so as to guide the gas to flow along the generatrix of the cone surface to the contact area between the positioning sleeve and the positioning cone.

[0022] Furthermore, a rotating connector is provided at the connection between the air blowing pipe and the air distribution block to realize the angle adjustment of the air blowing pipe;

[0023] The rotating connector includes a transition shaft and a sleeve. One end of the transition shaft is fixedly connected to the air blowing pipe, and the other end extends into the inner hole of the sleeve. The end of the sleeve away from the transition shaft is fixedly connected to the air distribution block, and the inner hole of the transition shaft is connected to the air distribution path in the air distribution block.

[0024] The section of the transition shaft that extends into the inner hole of the sleeve is rotatably fitted into the sleeve via a bearing assembly. A torsion spring is provided between the sleeve and the transition shaft. One end of the torsion spring is fixed to the sleeve, and the other end is fixed to the transition shaft. Under the elastic force of the torsion spring, the air blowing pipe switches between a first position and a second position.

[0025] Furthermore, the bearing assembly includes a linear bearing, a first end face bearing, and a second end face bearing;

[0026] The linear bearing is disposed in the annular mounting groove inside the sleeve and slides in contact with the transition shaft.

[0027] The end of the transition shaft away from the air blowing pipe extends out of the end of the sleeve, and the first end face bearing and the second end face bearing are stacked on the extended end of the transition shaft along the axial direction of the transition shaft;

[0028] Furthermore, a limiting disc is provided at the extended end of the transition shaft, and the limiting disc is located between the first end face bearing and the second end face bearing to achieve axial positioning of the transition shaft.

[0029] Furthermore, a telescopic push rod is provided on the circumference of the positioning cone corresponding to the position of the air blowing pipe, and the telescopic push rod abuts against the outer peripheral wall of the air blowing pipe; the telescopic push rod includes:

[0030] The fixing base is fixed on the positioning cone;

[0031] A support rod is slidably disposed coaxially in the inner hole of the fixed base, and a positioning groove is provided at one end extending out of the fixed base. The contour of the positioning groove is adapted to the outer contour of the air blowing pipe.

[0032] A spring is sleeved on the shaft section of the support rod located in the inner hole of the fixed seat, with one end of the spring abutting against the bottom wall of the inner hole of the fixed seat and the other end abutting against the shoulder of the support rod.

[0033] A guide rail assembly is provided below the air distribution block, and the air distribution block can slide on the guide rail assembly to cooperate with the telescopic top rod to adjust the position of the air blowing pipe.

[0034] Furthermore, it also includes an airflow regulating unit, which is connected in series between the air passage of the central oil distribution shaft inside the rotary table and the air distribution block, and is used to regulate the airflow pressure delivered to the air blowing pipe.

[0035] The technical solution of this invention can achieve the following technical effects:

[0036] In this invention, a continuous air curtain wall formed by two air blowing pipes fully covers the cone surface of the positioning cone, blocking the contact between iron filings and the cone surface from the source, completely avoiding the problem of iron filings getting stuck and causing positioning misalignment, and ensuring the positioning accuracy and repeatability of the exchange worktable. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 Schematic diagram of the installation structure of the positioning cone air blowing device for the exchange workbench;

[0039] Figure 2 A schematic diagram of the air blowing device for the positioning cone used in the workbench exchange;

[0040] Figure 3 A schematic diagram showing the positional relationship between a set of air blowing pipes and the positioning cone;

[0041] Figure 4 This is a schematic diagram of a set of air tubes corresponding to positioning cones;

[0042] Figure 5 for Figure 4 A magnified view of part A;

[0043] Figure 6 This is a schematic diagram showing the installation position of the rotating connector;

[0044] Figure 7 This is a schematic diagram showing a set of air tubes switching from a first position to a second position;

[0045] Figure 8 for Figure 7 BB section sectional view;

[0046] Figure 9 for Figure 8 A magnified view of a portion at point C;

[0047] Figure 10 This is a schematic diagram of the installation of the telescopic jack and guide rail assembly.

[0048] Figure 11 This is a schematic diagram showing the switching of the air blowing pipe under the guidance of the telescopic top rod.

[0049] Figure 12 This is a schematic diagram of the cross-section of the telescopic jack.

[0050] Reference numerals: 10, positioning cone; 20, rotary table; 1, air distribution block; 11, air distribution chamber; 2, air blowing pipe; 21, obliquely cut guide surface; 3, rotating connector; 31, transition shaft; 311, limiting plate; 32, sleeve; 33, torsion spring; 34, linear bearing; 35, first end face bearing; 36, second end face bearing; 4, telescopic top rod; 41, fixed seat; 42, support rod; 43, spring; 5, guide rail assembly. Detailed Implementation

[0051] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] like Figures 1-12 As shown, the present invention provides an air blowing device for a positioning cone 10 on an exchange workbench, which is installed on a rotary table 20. It includes an air supply unit, an air distribution unit, and multiple air blowing units. The air supply unit is used to provide a compressed air source. The air distribution unit includes multiple air distribution blocks 1, each of which is connected to the air supply unit. The multiple air blowing units are arranged one-to-one with the multiple positioning cones 10 on the rotary table 20, and each air blowing unit is connected to the same air distribution block 1.

[0054] Each air blowing unit contains at least two air blowing pipes 2 installed face to face, one air blowing pipe 2 facing one side of the circumferential conical surface of the positioning cone 10, and the other air blowing pipe 2 facing the opposite side of the circumferential conical surface of the positioning cone 10.

[0055] The gas supply unit continuously supplies gas to each gas distribution block 1. After being distributed by the gas distribution block 1, the gas is ejected from the nozzles of the two air blowing pipes 2 of each group of air blowing units. The ejected airflows converge on the conical surface to form an air curtain wall.

[0056] The rotary table 20 is a disc structure used by the machining center to drive the machining disc surface to rotate. Four positioning cones 10 are evenly distributed on its edge. The positioning cones 10 are conical components used in the prior art for positioning and exchanging worktables, with a cone angle of 60°. The air blowing unit consists of four groups, each group corresponding to one positioning cone 10.

[0057] In this scheme, the air blowing device of the positioning cone 10 operates in a continuous air supply mode, that is, the air supply is started synchronously after the machining center is powered on, and the air supply stops when the machining center is powered off, maintaining the integrity of the air curtain wall throughout the process. The specific working process is as follows: When the machining center starts the exchange program of the exchange worktable, the air supply passage is powered on and the external air compressor is started. The compressed air source enters the air distribution unit through the central oil distribution shaft inside the rotary table 20. Each air distribution block 1 evenly distributes the air source to the air blowing unit connected to it. The two air blowing pipes 2 of each air blowing unit spray high-speed airflow to the opposite side of the positioning cone 10. After the two airflows collide on the cone surface, they diffuse along the circumference of the cone surface, forming a continuous air curtain covering the entire cone surface of the positioning cone 10. During the process of the rotary table 20 driving the exchange worktable to rotate 180°, the iron filings remaining on the exchange worktable fall off with the centrifugal force of rotation. The air curtain blocks the iron filings outside the positioning cone 10 through the impact force of the airflow. At the same time, the air curtain continuously blows the cone surface to remove any small iron filings that may have been attached, ensuring that the cone surface is clean.

[0058] In this invention, a continuous air curtain wall formed by two air blowing pipes 2 completely covers the cone surface of the positioning cone 10, blocking the contact between iron filings and the cone surface from the source, completely avoiding the problem of iron filings getting stuck and causing positioning misalignment, and ensuring the positioning accuracy and repeatability of the exchange worktable.

[0059] In this embodiment, each air distribution block 1 has at least one air distribution chamber 11 inside; the air distribution chamber 11 is provided with a main air passage and two air distribution passages connected to each other. The main air passage is connected to the air supply unit, and the two air distribution passages are respectively connected to two air blowing pipes 2 of the same group of air blowing units.

[0060] Each air distribution block 1 has an air distribution chamber 11 inside, corresponding to a set of air blowing units. If the air distribution block 1 needs to be connected to two sets of air blowing units at the same time, two independent air distribution chambers 11 can be opened. The connection end between the main air passage and the air supply passage and the connection end between the air distribution passage and the air blowing pipe 2 are all sealed to ensure the airtightness of the air passage inside the air distribution chamber 11. The sealing structure is an existing structure and will not be described in detail here.

[0061] During the gas supply process, the compressed air delivered by the gas supply passage enters the gas distribution chamber 11 through the main gas passage. After the airflow diffuses and is buffered in the gas distribution chamber 11, it simultaneously enters two symmetrically arranged gas distribution passages. The flow resistance of the airflow in the two gas distribution passages is the same, which can achieve the effect of equal flow rate from both passages.

[0062] This invention uses the air distribution chamber 11 of the air distribution block 1 to stably distribute airflow, ensuring that the outlet pressure and flow rate of the two air blowing pipes 2 are consistent, and avoiding the phenomenon of discontinuity in the air curtain wall due to weak airflow on one side. This ensures that the air curtain wall formed by the air supply pressure can effectively block iron filings.

[0063] In this invention, the air supply unit includes at least one air supply passage on the central oil distribution shaft inside the rotary table 20; the air inlet end of the air supply passage is connected to an external air source through a rotary air connector, and the air outlet end is connected to multiple air distribution blocks 1 in the air distribution unit through a connecting air pipe, so as to realize the synchronous air supply of multiple air distribution blocks 1.

[0064] Compressed air supplied by an external air compressor enters the rotary air connector through a high-pressure hose. The rotating end of the air connector rotates synchronously with the central distribution shaft, while the fixed end remains stationary, thus achieving continuous air supply. The compressed air supplied by the air connector enters the main air supply passage of the central distribution shaft. The multi-port connector at the outlet of the main air supply passage diverts the airflow at equal pressure to four connecting air pipes, enabling the four air blowing units to simultaneously obtain a stable air source, and causing the four positioning cones 10 on the rotary table 20 to simultaneously form an air curtain.

[0065] By utilizing the central oil distribution shaft inside the rotary table 20 to integrate the air supply path, there is no need to lay additional external air pipes, avoiding interference between the pipeline and the rotation of the rotary table 20, and adapting to the compact space layout of the machining center.

[0066] The difference in the jet angle and velocity of the two airflows ejected from the two air-blowing pipes 2 in this invention can cause turbulence near the cone surface. This turbulence may pick up the blown-off iron filings, causing them to move randomly in the airflow and even adhere to the uncovered areas of the cone surface, resulting in secondary pollution. To avoid this, the two air-blowing pipes 2 in a set of air-blowing units are symmetrically arranged on both sides of the positioning cone 10, and the outlet ends of the two air-blowing pipes 2 are horizontally positioned. At this time, the airflow ejected from the two air-blowing pipes 2 will form a symmetrical airflow with the axis of the positioning cone 10 as the center. The two airflows first contact the cone surface, obtain the component force along the tangential direction of the cone surface, and then diffuse in the circumferential direction. The airflows that diffuse in the circumferential direction along the cone surface can naturally converge to form a continuous closed air curtain. For iron filings falling from any circumferential position of the positioning cone 10, the symmetrical air curtain can block them with the same force, avoiding the risk of iron filings penetrating on the side with weaker airflow.

[0067] As a preferred embodiment, the air blowing pipe 2 has a U-shaped curved structure, and the opening directions of the two air blowing pipes 2 are arranged opposite each other; one end of the air blowing pipe 2 located at the air inlet is installed on the air distribution block 1, while the other end located at the air outlet faces the generatrix of the positioning cone 10.

[0068] Specifically, the air blowing pipe 2 is made of copper pipe and is formed into a U-shaped structure by a CNC pipe bending machine. The two straight sections are parallel to the surface of the rotary table 20, serving as the air inlet and air outlet, respectively. Alternatively, the air blowing pipe 2 can also adopt an L-shaped structure, with its straight section serving as the air outlet. The specific combination is not limited.

[0069] After the airflow enters the blowing pipe 2 through the air inlet via the air distribution block 1, it turns 180° through the bend section and finally sprays out from the air outlet toward the positioning cone 10. This turning and guiding ensures the stability of the airflow path, while the bend section can buffer the instantaneous fluctuations of the air source, making the airflow pressure at the outlet more stable.

[0070] In a preferred embodiment of the present invention, the outlet of the air blowing pipe 2 is located below the contact area between the positioning cone 10 and the positioning sleeve; the end of the outlet of the air blowing pipe 2 is provided with a beveled guide surface 21, which is parallel to the extension direction of the generatrix of the cone surface, so as to guide the gas to flow along the generatrix of the cone surface to the contact area between the positioning sleeve and the positioning cone 10. It should be noted that the contact area between the positioning cone 10 and the positioning sleeve is specifically the core mating area where the cone surfaces of the two fit tightly together when the positioning sleeve is inserted downward along the axis of the positioning cone 10; and the contact area between the positioning cone 10 and the positioning sleeve is the upper middle part of the cone surface of the positioning cone 10, and the outlet of the air blowing pipe 2 is located directly below this contact area, ensuring that the outlet does not interfere with the insertion action of the positioning sleeve.

[0071] The end of the air outlet of the air blowing pipe 2 is ground to form a beveled guide surface 21. The beveled guide surface 21 is parallel to the generatrix of the cone surface, so that the ejected airflow flows upward along the generatrix direction, forming an airflow band that climbs along the cone surface. The airflow band extends upward from the air outlet and wraps around the cone surface in a flow pattern that adheres to the cone surface, thereby accurately guiding the gas to the cleaning requirement area of ​​the cone surface of the positioning cone 10.

[0072] As a preferred embodiment of the present invention, a rotating connector 3 is provided at the connection between the air blowing pipe 2 and the air distribution block 1 to realize the angle adjustment of the air blowing pipe 2; the rotating connector 3 includes a transition shaft 31 and a sleeve 32, one end of the transition shaft 31 is fixedly connected to the air blowing pipe 2, and the other end extends into the inner hole of the sleeve 32; the end of the sleeve 32 away from the transition shaft 31 is fixedly connected to the air distribution block 1, and the inner hole of the transition shaft 31 is connected to the air distribution path in the air distribution block 1;

[0073] The section of the transition shaft 31 extending into the inner hole of the sleeve 32 is rotatably fitted within the sleeve 32 via a bearing assembly. A torsion spring 33 is provided between the sleeve 32 and the transition shaft 31. One end of the torsion spring 33 is fixed to the sleeve 32, and the other end is fixed to the transition shaft 31. Under the elastic force of the torsion spring 33, the air blowing pipe 2 switches between a first position and a second position. The first position refers to the air outlet of the air blowing pipe 2 being located in the contact area between the positioning cone 10 and the positioning sleeve; while the second position refers to the pipe end of the air outlet of the air blowing pipe 2 being located below the contact area between the positioning cone 10 and the positioning sleeve. A sealing ring is provided at the section of the transition shaft 31 that engages with the air distribution block 1, so that even if the transition shaft 31 rotates, the sealing ring can still maintain the air passage seal.

[0074] When no external force is applied, the preload of the torsion spring 33 is transmitted to the air blowing pipe 2 through the transition shaft 31, keeping the air blowing pipe 2 stably in the first position. At this time, the air outlet is aligned with the upper part of the cone surface of the positioning cone 10, and the airflow forms an air curtain along a preset path to ensure the cleaning effect. When the positioning sleeve begins to descend, the external torque is greater than the preload torque of the torsion spring 33, and the transition shaft 31 will rotate around the bearing assembly inside the sleeve 32. The air blowing pipe 2 deflects outward with the transition shaft 31 to the second position. During the gradual deflection process, the airflow cleans the cone surface from top to bottom. When the positioning sleeve is lifted upward, the torsion spring 33 releases the stored elastic potential energy, driving the transition shaft 31 to rotate in the opposite direction, causing the air blowing pipe 2 to automatically return to the first position.

[0075] Based on the above embodiments, preferably, the bearing assembly includes a linear bearing 34, a first end face bearing 35, and a second end face bearing 36; the linear bearing 34 is disposed in the annular mounting groove inside the sleeve 32 and slides in contact with the transition shaft 31 to achieve radial support for the transition shaft 31;

[0076] The end of the transition shaft 31 away from the air pipe 2 extends out of the end of the sleeve 32. The first end face bearing 35 and the second end face bearing 36 are stacked on the extended end of the transition shaft 31 along the axial direction of the transition shaft 31. A limiting disk 311 is provided at the extended end of the transition shaft 31. The limiting disk 311 is located between the first end face bearing 35 and the second end face bearing 36 to achieve axial positioning of the transition shaft 31.

[0077] Press the linear bearing 34 into the annular mounting groove inside the sleeve 32, ensuring that there is no gap between the outer ring and the groove wall; insert the mating shaft section of the transition shaft 31 from the open end of the sleeve 32, so that the transition shaft 31 extends out of the end of the sleeve 32; sequentially install the first end face bearing 35, the limiting plate 311, and the second end face bearing 36 on the extended end of the transition shaft 31; screw the sleeve 32 into the air distribution block 1 until the second end face bearing 36 is pressed against the mounting hole end face of the air distribution block 1, and the assembly is completed.

[0078] Based on the above embodiments, in order to ensure that the air blowing pipe 2 always blows air along the generatrix of the cone surface of the positioning cone 10, a telescopic top rod 4 is provided at the position of the air blowing pipe 2 in the circumferential direction of the positioning cone 10. The telescopic top rod 4 abuts against the outer peripheral wall of the air blowing pipe 2. The telescopic top rod 4 includes: a fixed seat 41, a support rod 42 and a spring 43. The fixed seat 41 is fixed on the positioning cone 10. The support rod 42 is slidably disposed coaxially in the inner hole of the fixed seat 41. A positioning groove is provided at one end of the support rod 42 that extends out of the fixed seat 41. The contour of the positioning groove is adapted to the outer peripheral contour of the air blowing pipe 2. The spring 43 is sleeved on the shaft section of the support rod 42 located in the inner hole of the fixed seat 41. One end of the spring 43 abuts against the bottom wall of the inner hole of the fixed seat 41, and the other end abuts against the shoulder of the support rod 42.

[0079] A guide rail assembly 5 is installed below the air distribution block 1. The air distribution block 1 can slide on the guide rail assembly 5 to adjust the position of the air blowing pipe 2 in conjunction with the telescopic top rod 4.

[0080] Each air blowing unit is equipped with two telescopic top rods 4. After the air blowing pipe 2 is embedded in the positioning groove of the telescopic top rod 4, the two side walls of the positioning groove are in contact with the outer peripheral wall of the air blowing pipe 2. This restricts the displacement of the air blowing pipe 2 in the sliding direction, but does not restrict the rotation of the air blowing pipe 2 in the positioning groove. In addition, a rotating part can also be set on the shaft section of the air blowing pipe 2 located at the air outlet to reduce the wear between the air blowing pipe 2 and the inner wall of the positioning groove.

[0081] When the air blowing pipe 2 switches from the first position to the second position, the support rod 42 slides synchronously along the inner hole of the fixed seat 41 as the air blowing pipe 2 deflects. The spring 43 is further compressed, while the positioning groove always fits against the outer circumference of the air blowing pipe 2, ensuring that the air outlet of the air blowing pipe 2 always sprays air in a directional manner along the extension direction of the generatrix of the positioning cone 10. This ensures that the airflow always accurately covers the generatrix, and with the generatrix as a reference, the airflow is in a stable laminar flow state, flowing along the generatrix from the upper contact area of ​​the positioning cone 10 to the bottom of the cone, effectively eliminating cleaning dead angles in the circumferential and axial directions of the cone surface. Preferably, the sliding guide rail assembly 5 adopts a cooperative structure of guide rail and slider.

[0082] In a preferred embodiment of the present invention, the air blowing device of the positioning cone 10 further includes an airflow regulating unit, which is connected in series between the air passage of the central oil distribution shaft inside the rotary table 20 and the air distribution block 1, and is used to regulate the airflow pressure delivered to the air blowing pipe 2.

[0083] In a preferred embodiment, the airflow regulating unit includes a pressure regulating valve, a flow meter, and a check valve connected in sequence. The inlet of the pressure regulating valve is sealed and connected to the air supply passage of the central oil distribution shaft through a pipeline, receiving compressed gas from the main air source. The outlet of the pressure regulating valve is connected to the inlet of the flow meter, used to deliver the regulated airflow to the flow meter. The outlet of the flow meter is connected to the inlet of the check valve, and the flow rate is monitored in real time by the flow meter. The outlet of the check valve is sealed and connected to the main air passage of the air distribution block 1 through a pipeline, and finally delivers the stable airflow to the blowing pipe 2.

[0084] When machining is heavy-duty, the amount and size of the generated iron filings are large, requiring a stronger airflow to prevent them from adhering. In this case, the output pressure is increased by turning the pressure regulating valve knob to ensure that the airflow velocity from the air pipe 2 can effectively remove large-diameter iron filings. Conversely, when machining is light-duty, the amount and size of the generated iron filings are small, and excessively high pressure is not necessary to meet cleaning requirements. In this case, the output pressure of the pressure regulating valve is decreased to maintain the airflow velocity, meeting cleaning needs while avoiding air waste caused by high pressure. Through the settings of the airflow adjustment unit, it can adapt to the amount of residual iron filings generated by different sized exchange worktables, ensuring that matching cleaning power is provided in various machining scenarios.

[0085] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A positioning cone air blowing device for an exchange workbench, mounted on a rotary table, characterized in that, include: The air supply unit is used to provide compressed air. The gas distribution unit includes multiple gas distribution blocks, and each gas distribution block is connected to the gas supply unit. Multiple sets of air blowing units are set one-to-one with multiple positioning cones on the rotary table, and each set of air blowing units is connected to the same air distribution block. Each of the air blowing units includes at least two air blowing pipes installed face to face, one of which faces the conical surface of the positioning cone on one side of the circumference and the other air blowing pipe faces the conical surface of the positioning cone on the opposite side of the circumference. The gas supply unit continuously supplies gas to each of the gas distribution blocks. After being distributed by the gas distribution blocks, the gas is ejected from the openings of the two air blowing pipes of each group of air blowing units. The ejected airflows converge on the conical surface to form an air curtain wall. A rotating connector is provided at the connection between the air blowing pipe and the air distribution block to realize the angle adjustment of the air blowing pipe; The rotating connector includes a transition shaft and a sleeve. One end of the transition shaft is fixedly connected to the air blowing pipe, and the other end extends into the inner hole of the sleeve. The end of the sleeve away from the transition shaft is fixedly connected to the air distribution block, and the inner hole of the transition shaft is connected to the air distribution path in the air distribution block. The shaft section of the transition shaft that extends into the inner hole of the sleeve is rotatably fitted into the sleeve through a bearing assembly. A torsion spring is provided between the sleeve and the transition shaft. One end of the torsion spring is fixed on the sleeve, and the other end is fixed on the transition shaft. Under the elastic force of the torsion spring, the air blowing pipe switches between a first position and a second position. The bearing assembly includes a linear bearing, a first end face bearing, and a second end face bearing. The linear bearing is disposed in the annular mounting groove inside the sleeve and slides in contact with the transition shaft. The end of the transition shaft away from the air blowing pipe extends out of the end of the sleeve, and the first end face bearing and the second end face bearing are stacked on the extended end of the transition shaft along the axial direction of the transition shaft; Furthermore, a limiting disc is provided at the extended end of the transition shaft, and the limiting disc is located between the first end face bearing and the second end face bearing to achieve axial positioning of the transition shaft; A telescopic top rod is provided in the circumferential direction of the positioning cone at the position corresponding to the air blowing pipe, and the telescopic top rod abuts against the outer peripheral wall of the air blowing pipe; The telescopic push rod includes: The fixing seat is fixed on the positioning cone; The support rod is slidably disposed coaxially in the inner hole of the fixed base, and a positioning groove is provided at one end extending out of the fixed base. The contour of the positioning groove is adapted to the outer circumferential contour of the air blowing pipe. A spring is sleeved on the shaft section of the support rod located in the inner hole of the fixed seat, with one end of the spring abutting against the bottom wall of the inner hole of the fixed seat and the other end abutting against the shoulder of the support rod. A guide rail assembly is provided below the air distribution block, and the air distribution block can slide on the guide rail assembly to cooperate with the telescopic top rod to adjust the position of the air blowing pipe.

2. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, Each of the gas distribution blocks has at least one gas distribution chamber inside; The air distribution chamber is provided with a main air path and two air distribution paths that are connected to each other. The main air path is connected to the air supply unit, and the two air distribution paths are respectively connected to the two air blowing pipes of the same group of air blowing units.

3. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, The air supply unit includes at least one air supply passage disposed on the central oil distribution shaft inside the rotary table; The air inlet of the air supply passage is connected to an external air source through a rotary air connector, and the air outlet is connected to multiple air distribution blocks in the air distribution unit through connecting air pipes, so as to realize the synchronous air supply of multiple air distribution blocks.

4. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, Two air-blowing pipes in one air-blowing unit are symmetrically arranged on both sides of the positioning cone, and the outlet ends of the two air-blowing pipes are horizontally arranged.

5. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, The air blowing pipe has a U-shaped curved structure, and the opening directions of the two air blowing pipes are arranged opposite to each other; The air blowing pipe is installed on the air distribution block at one end of the air inlet, and the air outlet is set facing the generatrix of the positioning cone at the other end.

6. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, The air outlet of the air blowing pipe is located below the contact area between the positioning cone and the positioning sleeve; The outlet end of the air blowing pipe is provided with a beveled guide surface, which is parallel to the extension direction of the generatrix of the cone surface, so as to guide the gas to flow along the generatrix of the cone surface to the contact area between the positioning sleeve and the positioning cone.

7. The positioning cone air blowing device for the exchange workbench according to claim 1, characterized in that, It also includes an airflow regulating unit, which is connected in series between the air passage of the central oil distribution shaft inside the rotary table and the air distribution block, and is used to regulate the airflow pressure delivered to the air blowing pipe.

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