A double exchange worktable based on a worm and gear pair and oil pressure composite drive

Abstract

The present application relates to the technical field of exchange workbench, especially to a double exchange workbench based on worm and oil pressure composite drive, comprising a mounting seat; a rotary drive mechanism comprising a main shaft, a worm sleeved on the main shaft, and a worm gear engaged with the worm; an oil pressure drive mechanism coaxially arranged inside the main shaft, comprising a piston rod fixed on the mounting seat, a sliding sleeve sleeved on the outside of the piston rod, and a cover arranged below the sliding sleeve, the top of the sliding sleeve being connected with an exchange support plate; a sliding shaft section on the piston rod forms an ascending oil chamber and a descending oil chamber in the cavity of the sliding sleeve, an ascending oil inlet and a descending oil inlet are arranged on the piston rod, a positioning shaft section is arranged at one end of the piston rod in the ascending oil chamber, and the ascending oil chamber is provided with a positioning cavity. The positioning shaft section and the positioning cavity play a centering guiding role for the descending sliding sleeve, avoid the offset of the sliding axis, ensure the coaxiality of the sliding sleeve and the piston, and further ensure the positioning accuracy of the rotary workbench.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exchange workbench, in particular to a double exchange workbench based on worm and oil pressure composite drive. BACKGROUND

[0002] In the field of mechanical processing, with the increasing demand of users for efficient processing, the single workbench adopted by the traditional machining center is gradually replaced by double workbench and multi-workbench to save the workpiece loading and unloading time and improve the processing efficiency. The traditional workbench device stops waiting for the operator to replace the workpiece after a processing cycle, and then the device can continue processing. Since the double exchange workbench can process while waiting for loading and unloading workpieces, it will not affect the continuous operation of the device when replacing workpieces in two processing cycles. One can operate multiple devices to save labor, and in the unmanned automatic production line, the double exchange workbench is the best choice for loading and unloading workpieces by robots.

[0003] In the prior art, the exchange workbench includes a transversely arranged pre-tool, a cam roller rotary table and a lifting rotary device. The pre-tool is used to pre-clamp the workpiece on the rotary table when the cam roller rotary table processes the workpiece. The lifting rotary device drives the lifting of the exchange support plate under the action of oil pressure, so as to simultaneously realize the lifting of the rotary table of the pre-tool and the rotary table of the cam roller rotary table, and perform rotary exchange, thereby reducing the downtime of the cam roller rotary table and improving the processing efficiency.

[0004] However, due to the weight deviation between the processed workpiece and the unprocessed workpiece, the exchange support plate rotation is easily affected by gravity and inclined during the lifting of the lifting rotary device, which causes the axis to deviate towards the heavy side, seriously affecting the positioning accuracy of the rotary table. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a double exchange workbench based on worm and oil pressure composite drive, which effectively solves the problems in the background art.

[0006] To achieve the above purpose, the technical solution adopted by the present application is: a double exchange workbench based on worm and oil pressure composite drive, comprising: a mounting seat;

[0007] A rotary drive mechanism is arranged inside the mounting seat and comprises a vertical main shaft, a worm sleeve arranged on the main shaft, and a worm perpendicular to the main shaft and meshing with the worm.

[0008] The oil pressure driving mechanism is coaxially arranged inside the main shaft, comprising a piston rod fixed on the mounting base, a sliding sleeve sleeved outside the piston rod, and a cover arranged below the sliding sleeve, and an exchange support plate is connected above the sliding sleeve.

[0009] The sliding shaft section on the piston rod forms the ascending oil chamber and the descending oil chamber in the cavity of the sliding sleeve, and the ascending oil inlet and the descending oil inlet are arranged on the piston rod, one end of the piston rod in the ascending oil chamber is provided with a positioning shaft section, and the ascending oil chamber is provided with a positioning cavity matched with the positioning shaft section.

[0010] Further, the oil inlet hole of the ascending oil inlet is arranged on the end face of the positioning shaft section, and the ascending oil chamber is in a vacuum state when the positioning shaft section slides in the positioning cavity.

[0011] Further, the oil inlet hole of the descending oil inlet is arranged on the cylindrical surface of the piston rod and located at one end of the sliding shaft section.

[0012] The piston rod is provided with an annular oil groove corresponding to the oil inlet hole of the descending oil inlet, and a conical abutting surface is arranged on the cover, and the annular oil groove and the conical abutting surface form an oil pressure buffer groove when the sliding sleeve rises to a set position.

[0013] Further, a sealing ring is arranged on the outer cylindrical surface in contact with the sliding shaft section.

[0014] Further, a convex ring is arranged on the end face of the cover close to the sliding sleeve, the convex ring is embedded in the descending oil chamber, and sealing rings are arranged on the inner and outer annular surfaces of the convex ring.

[0015] Further, an end face bearing is arranged on the stepped surface of the descending oil chamber close to the sliding shaft section.

[0016] Further, a sliding groove is arranged on the outer cylindrical surface of the sliding sleeve along the axis, a positioning key is arranged on the main shaft, and the positioning key extends into the sliding groove through the side wall of the main shaft.

[0017] Further, a first tapered roller bearing and a second tapered roller bearing are sleeved on the outer cylindrical surface of the main shaft and fixed on the mounting base, and the worm gear is arranged between the first tapered roller bearing and the second tapered roller bearing.

[0018] Further, a safety gap is left between the end of the main shaft close to the second tapered roller bearing and the mounting base.

[0019] Further, a top cover is arranged at one end of the mounting base close to the first tapered roller bearing, and an oil seal structure is arranged in the inner hole of the top cover.

[0020] The beneficial effects of the present application are that the ascending oil inlet path and the descending oil inlet path are arranged on the piston rod, external oil path layout space is saved, and the descending sliding sleeve is guided and centered by the arrangement of the positioning shaft section and the positioning cavity, the sliding axis is prevented from deviating, the coaxiality of the sliding sleeve and the piston is ensured, and the positioning accuracy of the rotary workbench is further ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a structural schematic diagram of the double exchange workbench based on the worm and gear pair and oil pressure composite driving in the embodiment of the present application.

[0023] Figure 2 It is an exploded schematic diagram of the double exchange workbench based on the worm and gear pair and oil pressure composite driving in the embodiment of the present application.

[0024] Figure 3 It is a sectional schematic diagram of the double exchange workbench based on the worm and gear pair and oil pressure composite driving in the embodiment of the present application.

[0025] Figure 4 It is a position schematic diagram of the ascending oil inlet path and the descending oil inlet path in the embodiment of the present application.

[0026] Figure 5 It is an A-A sectional schematic diagram of Figure 4

[0027] Figure 6 It is a state schematic diagram of the ascending oil cavity oil inlet making the sliding sleeve ascend to the highest point in the embodiment of the present application.

[0028] Figure 7 It is a C local enlarged view of Figure 6

[0029] Figure 8 It is an initial state schematic diagram of the positioning shaft sleeve embedded in the positioning cavity in the embodiment of the present application.

[0030] Figure 9 It is a state schematic diagram of the descending oil cavity oil inlet making the sliding sleeve descend to the lowest point in the embodiment of the present application.

[0031] ​​Reference numerals: 1. Mounting base; 11. Top cover; 12. Oil seal structure; 2. Rotary drive mechanism; 21. Main spindle; 22. Worm gear; 23. Worm; 24. Locating key; 25. First tapered roller bearing; 26. Second tapered roller bearing; 3. Hydraulic drive mechanism; 31. Piston rod; 311. Sliding shaft section; 312. Upward oil inlet; 313. Downward oil inlet; 314. Locating shaft section; 315. Annular oil groove; 32. Sliding sleeve; 321. Upward oil chamber; 322. Downward oil chamber; 323. Locating chamber; 324. Sliding groove; 33. Cover; 331. Conical abutment surface; 332. Convex ring; 4. Exchange tray; 5. Sealing ring; 6. End face bearing. Detailed Implementation

[0032] 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.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] 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.

[0035] like Figures 1 to 9 The dual-exchange worktable shown is based on a worm gear pair and hydraulic combined drive, and includes:

[0036] Mounting base 1 is positioned between the pre-tooling and the cam roller turntable;

[0037] The rotary drive mechanism 2 is installed inside the mounting base 1 and includes a vertically arranged main spindle 21, a worm wheel 22 sleeved on the main spindle 21, and a worm 23 perpendicular to the main spindle 21 and meshing with the worm wheel 22 for transmission; the worm 23 is rotated by a drive motor, and the rotation of the main spindle 21 is achieved by the meshing of the worm wheel 22 and the worm 23.

[0038] The oil pressure driving mechanism 3 is coaxially arranged inside the main shaft 21, comprising a piston rod 31 fixed on the mounting base 1, a sliding sleeve 32 sleeved outside the piston rod 31, and a cover 33 arranged below the sliding sleeve 32, and the exchange support plate 4 is connected above the sliding sleeve 32; the sliding sleeve 32 slides up and down along the axis of the piston rod 31, and drives the exchange support plate 4 to realize the lifting of the rotary workbench.

[0039] The sliding shaft section 311 on the piston rod 31 forms the ascending oil cavity 321 and the descending oil cavity 322 of the sliding sleeve 32, and the ascending oil inlet 312 and the descending oil inlet 313 are arranged on the piston rod 31, and the piston rod 31 is provided with a positioning shaft section 314 at one end of the ascending oil cavity 321, and the ascending oil cavity 321 is provided with a positioning cavity 323 matched with the positioning shaft section 314.

[0040] In the implementation process of the present application, when the hydraulic oil enters the ascending oil cavity 321 through the ascending oil inlet 312, the sliding sleeve 32 moves upward along the axis, and drives the exchange support plate 4 to move upward, and after rising to the set highest point, the servo motor drives the worm gear 22 and the worm 23 to drive, so that the main shaft 21 rotates, and the sliding sleeve 32 rotates synchronously to complete the exchange of the rotary workbench; after the exchange is completed, the ascending oil cavity 321 stops oiling, the hydraulic oil enters the descending oil cavity 322 through the descending oil inlet 313, the sliding sleeve 32 moves downward along the axis, and when the rotary workbench is lowered to the height of starting to be placed, the positioning shaft section 314 gradually embeds into the positioning cavity 323 until the two rotary workbenches on the exchange support plate 4 are placed in place; in the present application, the ascending oil inlet 312 and the descending oil inlet 313 are arranged on the piston rod 31, which saves the space of external oil path layout, and through the arrangement of the positioning shaft section 314 and the positioning cavity 323, the descending sliding sleeve 32 is guided and centered, the sliding axis is prevented from deviating, the coaxiality of the sliding sleeve 32 and the piston rod 31 is ensured, and the positioning accuracy of the rotary workbench is further ensured.

[0041] In the preferred embodiment of the present application, the oil inlet hole of the ascending oil inlet 312 is arranged on the end face of the positioning shaft section 314, when the sliding sleeve 32 is in the ascending stage, the hydraulic oil enters the positioning cavity 323 and the ascending oil cavity 321 through the ascending oil inlet 312 arranged in the piston rod 31, when the sliding sleeve 32 is in the descending stage, the hydraulic oil enters the descending oil cavity 322 through the descending oil inlet 313 arranged in the piston rod 31, the hydraulic oil in the positioning cavity 323 and the ascending oil cavity 321 is sucked out from the oil inlet hole of the ascending oil inlet 312, and when the positioning shaft section 314 starts to enter the positioning cavity 323, the ascending oil cavity 321 is in a vacuum state at this time, which effectively ensures the stability of the ascending and descending of the sliding sleeve 32.

[0042] In order to ensure the entry of hydraulic oil in the descending oil chamber 322 when the sliding sleeve 32 rises to the highest point, the oil inlet hole of the descending oil inlet channel 313 is arranged on the cylindrical surface of the piston rod 31 at one end of the sliding shaft section 311; when the sliding sleeve 32 needs to move downward, the hydraulic oil enters the descending oil chamber 322 along the radial direction through the oil inlet hole of the descending oil inlet channel 313, in order to ensure that the pressure generated by the oil inlet hole can better realize the axial driving of the sliding sleeve 32, preferably, the piston rod 31 is provided with an annular oil groove 315 corresponding to the oil inlet hole of the descending oil inlet channel 313, and a conical abutting surface 331 is arranged on the cover 33, the conical abutting surface 331 is divergent along the direction close to the sliding shaft section 311, when the sliding sleeve 32 rises to the set position, the annular oil groove 315 and the conical abutting surface 331 form an oil pressure buffer groove, the oil pressure buffer groove can convert the driving force of the radial hydraulic oil into an axial driving force, thereby ensuring the implementability of the sliding sleeve 32 along the axis.

[0043] In order to ensure the stability of the oil pressure in the ascending oil chamber 321 and the descending oil chamber 322, the outer cylindrical surface of the sliding shaft section 311 in contact with the sliding sleeve 32 is provided with a sealing ring 5, and since the bottom of the sliding sleeve 32 is designed as an opening, preferably, the end surface of the cover 33 close to the sliding sleeve 32 is provided with a convex ring 332, the convex ring 332 is embedded in the descending oil chamber 322, and the inner and outer annular surfaces of the convex ring 332 are both provided with a sealing ring 5, thereby further ensuring the sealing property of the descending oil chamber 322 by adopting double sealing on the inner and outer sides.

[0044] In the preferred embodiment of the present application, the end face bearing 6 is arranged on the stepped surface of the descending oil chamber 322 close to the sliding shaft section 311, when the sliding sleeve 32 rises to the highest point, the cover 33 clamps the end face bearing 6 with the stepped surface of the sliding shaft section 311, thereby reducing the friction between the sliding sleeve 32 and the piston rod 31 during rotation, prolonging the service life of the sliding sleeve 32, and ensuring the stability of the rotation of the sliding sleeve 32.

[0045] In order to ensure the reliability of the synchronous rotation of the sliding sleeve 32 and the main shaft 21, the outer cylindrical surface of the sliding sleeve 32 is provided with a sliding groove 324 along the axis, and the main shaft 21 is provided with a positioning key 24, the positioning key 24 extends into the sliding groove 324 through the side wall of the main shaft 21, thereby limiting the free end of the sliding sleeve 32, so that the sliding sleeve 32 only has the lifting function when the oil pressure enters, and the positioning accuracy of the exchange support plate 4 is improved.

[0046] Due to the friction between the sliding sleeve 32 and the inner hole of the main shaft 21 during lifting, the main shaft 21 is prone to axial displacement, which causes the meshing point of the worm gear 22 and the worm 23 to deviate, and it is difficult to ensure the rotation accuracy. Therefore, in order to avoid the axial displacement of the main shaft 21, preferably, the outer cylindrical surface of the main shaft 21 is sleeved with a first tapered roller bearing 25 and a second tapered roller bearing 26, and the main shaft 21 is suspended and fixed on the mounting seat 1. The worm gear 22 is arranged between the first tapered roller bearing 25 and the second tapered roller bearing 26. Through the arrangement of the first tapered roller bearing 25 and the second tapered roller bearing 26, the axial displacement of the main shaft 21 can be effectively limited, and the centering accuracy of the worm gear 22 between the first tapered roller bearing 25 and the second tapered roller bearing 26 is ensured, thereby effectively ensuring the meshing accuracy.

[0047] On the basis of the above embodiment, the end of the main shaft 21 close to the second tapered roller bearing 26 is left with a safety gap from the mounting seat 1, avoiding friction between the end face of the main shaft 21 and the mounting seat 1. In addition, hydraulic oil is injected into the mounting seat 1, and a drain hole is arranged on the inner surface of the mounting seat 1, so that the internal hydraulic oil can be smoothly discharged.

[0048] In the present application, when the sliding sleeve 32 drives the exchange support plate 4 to rise, the distance between the exchange support plate 4 and the upper top surface of the mounting seat 1 increases. In order to avoid dust entering the internal bearing and causing damage, the mounting seat 1 is provided with a top cover 11 at one end of the first tapered roller bearing 25, and an oil seal structure 12 is arranged in the inner hole of the top cover 11, which plays a good sealing and dustproof effect.

[0049] It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A dual-exchange worktable based on a worm gear pair and hydraulic combined drive, characterized in that, include: Mounting base; A rotary drive mechanism is disposed inside the mounting base, including a vertically arranged main spindle, a worm gear sleeved on the main spindle, and a worm perpendicular to the main spindle and meshing with the worm gear for transmission. The hydraulic drive mechanism is coaxially arranged inside the main spindle, including a piston rod fixed on the mounting base, a sliding sleeve sleeved on the outside of the piston rod, and a cover disposed below the sliding sleeve. An exchange tray is connected above the sliding sleeve. The sliding shaft section on the piston rod enables the cavity of the sliding sleeve to form a rising oil cavity and a falling oil cavity. The piston rod is provided with a rising oil inlet and a falling oil inlet. The piston rod is provided with a positioning shaft section at one end of the rising oil cavity. The rising oil cavity is provided with a positioning cavity that cooperates with the positioning shaft section. The outer cylindrical surface of the sliding sleeve is provided with a groove along the axis, and the main spindle is provided with a positioning key, which passes through the side wall of the main spindle and extends into the groove. The outer cylindrical surface of the main spindle is fitted with a first tapered roller bearing and a second tapered roller bearing, and is fixed on the mounting base. The worm gear is disposed between the first tapered roller bearing and the second tapered roller bearing.

2. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, The oil inlet hole of the rising oil inlet is located on the end face of the positioning shaft section. When the positioning shaft section slides in the positioning cavity, the rising oil cavity is in a vacuum state.

3. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, The oil inlet hole of the descending oil inlet passage is provided on the cylindrical surface of the piston rod and is located at one end of the sliding shaft section; The piston rod is provided with an annular oil groove at the oil inlet hole corresponding to the lowering oil inlet path, and a conical abutment surface is provided on the cover. When the sliding sleeve rises to the set position, the annular oil groove and the conical abutment surface form an oil pressure buffer groove.

4. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, A sealing ring is provided on the outer cylindrical surface of the sliding shaft section that contacts the sliding sleeve.

5. The dual-exchange worktable based on worm gear pair and hydraulic combined drive according to claim 1, characterized in that, The end face of the cover near the sliding sleeve is provided with a convex ring, which is embedded in the descending oil cavity, and a sealing ring is provided on both the inner and outer ring surfaces of the convex ring.

6. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, An end face bearing is provided on the stepped surface of the descending oil chamber near the sliding shaft section.

7. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, The end of the main spindle closest to the second tapered roller bearing has a safe clearance from the mounting base.

8. The dual-exchange worktable based on worm gear pair and hydraulic composite drive according to claim 1, characterized in that, The mounting base is provided with a top cover at one end of the first tapered roller bearing, and an oil seal structure is provided in the inner hole of the top cover.

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