A device for processing inner taper of bushing for forming chair leg

Abstract

A kind of axle sleeve inner taper processing device for chair leg forming, including positioning seat, be equipped with the profile slot of adaptation with chair leg middle part profile, for positioning chair leg;Processing device is fixed by rack directly above positioning seat, including box, first drive motor, polishing mechanism and drive mechanism;Feeding device is set below processing device and is cooperated with positioning seat, including lifting assembly, sliding assembly and carrying assembly, for realizing the automatic feeding and discharging of chair leg;Feeding device normal state delivery plane is lower than positioning seat, the feeding of the chair leg to be processed and the discharging of the processed chair leg are completed by the driving carrying assembly of lifting assembly and sliding assembly cooperation, by positioning seat, processing device and feeding device collaborative work, solve the inner taper precision problem caused by welding deformation, device uses automatic polishing mechanism to cooperate annular compression structure, combined with synchronous feeding and discharging system, realize high-precision taper processing, improve production efficiency and reduce the risk of manual intervention.

Description

Technical Field

[0001] This utility model relates to the field of chair leg manufacturing technology, specifically to a device for machining the inner taper of a bushing used in chair leg forming. Background Technology

[0002] Existing chair leg structures typically consist of an outer plate, an inner frame, and a bushing. First, a steel plate is stamped into the shape of a chair leg using a stamping machine. Then, the inner frame and bushing are welded to the inside of the outer plate of the chair leg to increase strength and form a complete chair leg. The inner ring of the bushing has a certain taper to facilitate the installation of the gas spring.

[0003] As the applicant previously developed a molding process for an integrally molded chair leg, referring to the Chinese patent application document with patent application number CN202211288191.7, the molding process includes a sheet metal cutting process and a stamping process arranged in sequence. By using the same first metal sheet to simultaneously stamp and bend a fixed seat and multiple legs, the fixed seat and multiple legs are integrally molded. The processing flow of the chair leg also includes a component welding process after the stamping process. A connecting seat is welded onto the finished chair leg body to obtain the chair leg. The connecting seat is located in the bending groove of the fixed seat, and the connecting seat has a central hole exposed from the top surface of the fixed seat.

[0004] In the aforementioned welding process, after welding the connecting seat to the chair base, reinforcing supports need to be welded around the connecting seat to improve its strength. However, during the welding process, local thermal expansion and contraction can cause internal stress in the connecting seat, resulting in deformation. Subsequent welding of the reinforcing supports further amplifies this deformation, altering the inner taper of the connecting seat. This phenomenon leads to a poor fit between the connecting seat and the pneumatic rod, such as gaps after insertion or the rod failing to insert. The traditional solution is manual secondary processing, but this is often impossible to judge visually and guarantee a perfect fit on the first attempt, requiring multiple attempts to achieve the desired fit. This undoubtedly increases time and labor costs, significantly reducing production efficiency. Furthermore, manual operation can create certain safety hazards. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a device for machining the inner taper of the bushing for forming chair legs.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An apparatus for machining the inner taper of a bushing for forming chair legs, comprising:

[0008] The positioning seat has a contour groove that matches the contour of the middle part of the chair leg for positioning the chair leg;

[0009] The processing device, which is fixed above the positioning seat by a frame, includes a housing, a first drive motor, a grinding mechanism, and a drive mechanism.

[0010] A feeding device, located below the processing device and cooperating with the positioning seat, includes a lifting component, a sliding component, and a loading component, used to realize the automatic loading and unloading of chair legs;

[0011] The feeding device normally conveys a plane lower than the positioning seat. The lifting component and the sliding component work together to drive the carrying component to load the chair legs to be processed and unload the processed chair legs.

[0012] In this utility model, the grinding mechanism includes a rotating shaft seat, a drive shaft and a grinding blade. The drive shaft passes through the rotating shaft seat from top to bottom and is provided with a limiting block. The top is connected to the first drive motor through a gear structure, and the bottom is detachably connected to the grinding blade.

[0013] The driving mechanism includes a second drive motor, a lead screw, and a transmission assembly. The second drive motor drives the lead screw to rotate through gear transmission, and the rotating shaft seat moves up and down through a connecting block threadedly engaging with the lead screw.

[0014] In this utility model, the grinding mechanism is provided with an external pressing device, including an annular pressing block and a telescopic cylinder. The annular pressing block is pressed and fitted around the chair leg bushing. The telescopic cylinder is linked with the second drive motor through a controller to achieve synchronous pressing during grinding.

[0015] In this utility model, the lifting assembly includes multiple sets of lifting devices and a sliding frame disposed on the top of the lifting devices. The sliding assembly includes a driver and a slider. The driver drives the slider to move along the sliding frame. The loading assembly includes a loading frame and an upper loading frame and an lower loading frame mounted on the loading frame.

[0016] The lifting components on both sides move synchronously through the controller, and the loading and unloading racks switch loading and unloading positions by moving horizontally.

[0017] In this invention, the housing is equipped with a spray pipe and a baffle. The spray pipe sprays cooling water onto the grinding tool, and the baffle surrounds the pressure block to prevent the cooling water from splashing.

[0018] Furthermore, the top gear structure of the drive shaft is a long toothed bar to ensure that the grinding mechanism continuously meshes with the first drive motor when it moves up and down.

[0019] Furthermore, the inner diameter of the annular pressure block matches the outer diameter of the chair leg bushing, and when pressed, it covers the area around the bushing.

[0020] Furthermore, the loading rack and unloading rack have the same structure and are arranged symmetrically, and the middle of the load rack is fixed to the slider to achieve force balance.

[0021] This utility model has the following advantages and beneficial effects:

[0022] By coordinating the positioning base, processing device, and feeding device, the problem of internal taper accuracy caused by welding deformation is solved. The device adopts an automated grinding mechanism combined with a ring clamping structure and a synchronous loading and unloading system to achieve high-precision taper processing, improve production efficiency, and reduce the risk of manual intervention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is an overall schematic diagram of the processing device in this embodiment;

[0025] Figure 2 This is a schematic diagram of the overall grinding device in this embodiment;

[0026] Figure 3 This is a schematic diagram of the internal structure of the grinding device in this embodiment;

[0027] Figure 4 This is a schematic diagram of the assembly of the grinding device and the drive mechanism in this embodiment;

[0028] Figure 5 This is a schematic diagram of the feeding device in this embodiment;

[0029] Figure 6 This is a top view of the feeding device in this embodiment. Detailed Implementation

[0030] 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. However, this utility model is not limited to the following embodiments.

[0031] like Figures 1 to 6As shown, this embodiment discloses a device for machining the inner taper of the bushing for forming chair legs. It includes a positioning seat 1 for positioning the chair legs, a grinding device 2 for grinding the inner taper of the bushing of the chair legs, and a feeding device 3 for automatically loading and unloading the chair legs. The grinding device 2 is fixed above the positioning seat 1 by a frame 4. The feeding device 3 is located below the grinding device 2 and cooperates with the positioning seat 1. The feeding device 3 transports the chair legs to the positioning seat 1 and places them there. Then, the bushing of the chair legs is ground by the grinding device 2. The positioning seat 1 is provided with a contour groove 11 that matches the contour of the middle part of the chair legs. After the feeding device 3 places the chair legs on the positioning seat 1, the middle part of the chair legs is embedded in the contour groove 11 to achieve positioning. The outer support legs of the chair legs extend out of the contour groove 11 and cooperate with the feeding device 3. During feeding, the feeding device 3 moves the chair legs by the outer support legs, such as lifting, lowering, and transferring.

[0032] Under normal conditions, the conveying plane of the feeding device 3 is lower than that of the positioning seat 1. The feeding device 3 includes a lifting assembly 31, a sliding assembly 32, and a carrying assembly 33. The sliding assembly 32 is fixed to the top of the lifting assembly 31, and the carrying assembly 33 is mounted on the sliding assembly 32. The lifting assembly 31 drives the carrying assembly 33 to move up and down through the sliding assembly 32, and the sliding assembly 32 drives the carrying assembly 33 to move horizontally. Specifically, the lifting assembly 31 includes multiple sets of lifting devices 311 and a sliding frame 312 fixed to the top of the multiple sets of lifting devices 311. The lifting device 311 is an electric actuator, a pneumatic rod, or a hydraulic rod, preferably an electric actuator, which can ensure lifting accuracy. The sliding assembly 32 includes a driver 321 mounted on the sliding frame 312 and a slider 322 that slides horizontally on the sliding frame 312. 321 drives the slider 322 to move horizontally along the sliding frame 312. The driver 321 is a common linear motion module on the market. Its specific structure and working principle will not be described in detail. The loading component 33 includes a loading frame 331 fixed on the slider 322, and an upper loading frame 332 and an lower loading frame 333 installed at both ends of the loading frame 331. The upper loading frame 332 and the lower loading frame 333 have the same structure, only the installation position is different. In addition, the middle part of the loading frame 331 is fixed on the slider 322. The upper loading frame 332 and the lower loading frame 333 at both ends of the loading frame 331 are symmetrically positioned to achieve force balance. In addition, the lifting component 31, the sliding component 32 and the loading frame 331 in the loading component 33 are all provided with two sets, and are symmetrically arranged on both sides of the positioning seat 1. The mechanism on both sides is connected to the controller to achieve synchronous operation.

[0033] In this embodiment, the working principle of the feeding device 3 is as follows: During loading and unloading, the unloading rack 333 is located below the positioning seat 1, and the loading rack 332 is located in the loading area. The chair legs to be processed are placed on the loading rack 332 by manual operation or other mechanisms. Subsequently, the lifting device 311 drives the carrying rack 331 to rise through the sliding frame 312. At this time, the loading rack 332 lifts the chair legs to be processed, while the unloading rack 333 lifts the chair legs that have been processed on the positioning seat 1. Then, the driver 321 drives the slider 322 to... The loading rack 331 moves toward the unloading rack 333. When the loading rack 332 moves directly above the positioning seat 1, it stops. Then, the lifting device 311 drives the loading rack 331 to descend via the sliding frame 312. During the descent of the loading rack 331, the loading rack 332 places the chair legs to be processed onto the positioning seat 1, while the unloading rack 333 places the processed chair legs into the unloading area for transfer, thus completing the synchronous loading and unloading process. Finally, the driver 321 drives the loading rack 331 to reset via the slider 322.

[0034] In this embodiment, the grinding device 2 includes a housing 21, a first drive motor 22 fixed to the top of the housing 21, a grinding mechanism 23 movably mounted inside the housing 21, and a drive mechanism 24 fixed to one side of the housing 21. The grinding mechanism 23 is connected to the first drive motor 22 to perform the grinding action, and the drive mechanism 24 drives the grinding mechanism 23 to move up and down so that it can approach or move away from the workpiece. The grinding mechanism 23 includes a rotating shaft seat 231, a drive shaft 232 rotatably fitted inside the rotating shaft seat 231, and a detachable mounting mechanism. The grinding tool 233 is located at the bottom of the drive shaft 232. The upper part of the rotating shaft seat 231 slides and engages with the housing 21. The lower part of the rotating shaft seat 231 extends from the bottom of the housing 21. The top of the drive shaft 232 engages with the first drive motor 22. The first drive motor 22 drives the grinding tool 233 to rotate through the drive shaft 232. A connecting block 234 is also provided on the outer side of the rotating shaft seat 231. The connecting block 234 engages with the drive mechanism 24. The drive mechanism 24 drives the grinding mechanism 23 to move up and down through the connecting block 234.

[0035] Furthermore, the drive shaft 232 extends vertically through the rotating shaft seat 231, and the upper and lower parts of the drive shaft 232 are respectively provided with an upper limit block 2321 and a lower limit block 2322. The upper limit block 2321 abuts against the upper end of the rotating shaft seat 231 to prevent the drive shaft 232 from slipping out of the rotating shaft seat 231, and the lower limit block 2322 is used to abut against the lower end of the rotating shaft seat 231 to provide downward pressure for the grinding tool 233. Furthermore, the top of the drive shaft 232 is provided with a long gear structure 2323, similar to a gear bar. The drive shaft 232 meshes with the drive gear on the first drive motor 22 through the gear structure 2323 to achieve driving. When the rotating shaft seat 231 moves up and down, the gear structure 2323 can keep the drive shaft 232 always meshing with the drive gear to ensure uninterrupted power.

[0036] Furthermore, the drive mechanism 24 includes a mounting base 241 fixed to the outside of the housing 21, a second drive motor 242 fixed to the mounting base 241, and a transmission assembly 243 installed inside the housing 21. The main body of the second drive motor 242 is fixed to the mounting base 241, and the drive end extends into the housing 21. The transmission assembly 243 includes a rotating seat 2431, a lead screw 2432 vertically mounted on the rotating seat 2431, a driven gear 2433 connected to the end of the lead screw 2432, and a driving gear 2434 connected to the drive end of the second drive motor 242. Gear 2434 meshes with driven gear 2433. In this embodiment, both the driving gear 2434 and the driven gear 2433 are bevel gears. When the second drive motor 242 drives the driving gear 2434 to rotate, the driven gear 2433 meshing with the driving gear 2434 drives the lead screw 2432 to rotate. The connecting block 234 on the rotating shaft seat 231 is threaded onto the lead screw 2432. Therefore, when the lead screw 2432 rotates, the connecting block 234 moves up and down along the lead screw 2432, thereby driving the rotating shaft seat 231 to move up and down, so that the grinding tool 233 can approach or move away from the workpiece.

[0037] In this embodiment, the grinding device 2 is further equipped with a clamping device 25 that presses the chair leg into the contour groove 11 during grinding. The clamping device 25 includes a connecting frame 251, a telescopic cylinder 252 fixed on the connecting frame 251, and a pressure block 253 installed on the telescopic cylinder 252. The pressure block 253 has a ring structure and presses against the bushing in the middle of the chair leg. The grinding blade 233 passes through the pressure block 253 and extends into the bushing for grinding. In addition, the second drive motor 242 and the telescopic cylinder 252 are linked by a controller. When the second drive motor 242 drives the rotating shaft seat 231 to rise, the telescopic cylinder 252 drives the pressure block 253 to rise accordingly. When the second drive motor 242 drives the rotating shaft seat 231 to fall, the telescopic cylinder 252 drives the pressure block 253 to fall accordingly and press the chair leg. By setting the clamping device 25, the chair leg can be completely positioned in the contour groove 11, improving the accuracy of grinding.

[0038] Furthermore, the housing 21 is also provided with a spray pipe 26 for spraying cooling water. The spray pipe 26 is connected to a water pump for water supply. The water pump is not shown in the attached drawings. The spray pipe 26 is composed of multiple pipe sections and nozzles. The spray pipe 26 is aligned with the grinding blade 233. During grinding, the rotating grinding blade 233 will cause cooling water to splash everywhere. Therefore, baffles 254 are also provided around the pressure block 253 to prevent cooling water from splashing everywhere.

[0039] The above description in this specification is merely an illustrative example of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the specific embodiments described or adopt similar methods to replace them, as long as they do not deviate from the content of this specification or exceed the scope defined in the claims, they shall all fall within the protection scope of this invention.

Claims

1. A device for machining the inner taper of a bushing in chair leg forming, characterized in that, include: The positioning seat (1) is provided with a contour groove (11) that matches the contour of the middle part of the chair leg for positioning the chair leg; The processing device is fixed above the positioning seat (1) by the frame (4) and includes a housing (21), a first drive motor (22), a grinding mechanism (23) and a drive mechanism (24). The feeding device (3) is located below the processing device and cooperates with the positioning seat (1), including a lifting component (31), a sliding component (32) and a loading component (33), for realizing automatic loading and unloading of chair legs; The feeding device (3) normally conveys a plane lower than the positioning seat (1). The lifting component (31) and the sliding component (32) work together to drive the loading component (33) to complete the loading of the chair legs to be processed and the unloading of the processed chair legs.

2. The device for machining the inner taper of a bushing for forming chair legs according to claim 1, characterized in that: The grinding mechanism (23) includes a rotating shaft seat (231), a drive shaft (232) and a grinding blade (233). The drive shaft (232) passes through the rotating shaft seat (231) from top to bottom and is provided with a limiting block. The top is engaged with the first drive motor (22) through a gear structure (2323), and the bottom is detachably connected to the grinding blade (233). The drive mechanism (24) includes a second drive motor (242), a lead screw (2432) and a transmission assembly (243). The second drive motor (242) drives the lead screw (2432) to rotate through gear transmission. The rotating shaft seat (231) moves up and down through a threaded connection between the connecting block (234) and the lead screw (2432).

3. A device for machining the inner taper of a bushing for forming chair legs according to claim 1 or 2, characterized in that: The grinding mechanism (23) is equipped with an external pressing device (25), including an annular pressing block (253) and a telescopic cylinder (252). The annular pressing block (253) is pressed tightly around the chair leg bushing. The telescopic cylinder (252) is linked with the second drive motor (242) through a controller to achieve synchronous pressing during grinding.

4. The device for machining the inner taper of a bushing for forming chair legs according to claim 1, characterized in that: The lifting assembly (31) includes multiple sets of lifting devices (311) and a sliding frame (312) located on top of the lifting devices (311). The sliding assembly (32) includes a driver (321) and a slider (322). The driver (321) drives the slider (322) to move along the sliding frame (312). The loading assembly (33) includes a loading frame (331) and an loading rack (332) and a unloading rack (333) mounted on the loading frame (331). The lifting components (31) on both sides move synchronously through the controller, and the loading rack (332) and unloading rack (333) switch loading and unloading positions by moving horizontally.

5. The device for machining the inner taper of a bushing for forming chair legs according to claim 1, characterized in that: The housing (21) is equipped with a spray pipe (26) and a baffle (254). The spray pipe (26) sprays cooling water onto the grinding tool (233), and the baffle (254) surrounds the pressure block (253) to prevent the cooling water from splashing.

6. The device for machining the inner taper of a bushing for forming chair legs according to claim 2, characterized in that: The top gear structure (2323) of the drive shaft (232) is a long toothed bar, which ensures that the grinding mechanism (23) continuously meshes with the first drive motor (22) when it moves up and down.

7. The device for machining the inner taper of a bushing for forming chair legs according to claim 3, characterized in that: The inner diameter of the annular pressure block (253) matches the outer diameter of the chair leg bushing, and when pressed, it covers the area around the bushing.

8. The device for machining the inner taper of a bushing for forming chair legs according to claim 4, characterized in that: The loading rack (332) and unloading rack (333) have the same structure and are arranged symmetrically. The middle part of the load rack (331) is fixed to the slider (322) to achieve force balance.

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