CN110238738B - Office chair foot polishing method - Google Patents

Abstract

The invention discloses a polishing method for office chair feet, which automatically polishes the office chair feet through a production line, wherein the production line comprises a material placing station, a material loading station, a clamping station, an end polishing station, a side polishing station, a center polishing station, a joint polishing station and a collecting station, and the polishing step comprises the following steps: a. placing chair legs to be processed on a material placing station; b. taking out the single chair leg from the material placing station through the material loading station; c. the chair legs taken out from the feeding station are fixed through the clamping station; d. polishing the end part of the chair leg through an end part polishing station, and e, polishing the side surface of the chair leg through a side surface polishing station; f. polishing the central ring of the chair leg through a central line polishing station; g. polishing the joint of the supporting leg of the chair leg and the central ring through a joint polishing station; h. and the polished chair legs are collected through the collecting station.

Description

A kind of office chair chair foot grinding method

technical field

The invention belongs to the technical field of office chair processing equipment, and in particular relates to a method for grinding office chair legs.

Background technique

For a swivel chair, the chair foot is a very important accessory. The quality of the chair foot is related to the overall quality level of the swivel chair. Generally speaking, the chair feet of metal materials are the most common, and there are also plastic (polypropylene) and nylon materials. However, polypropylene materials have the disadvantages of poor weather resistance and brittleness at low temperatures, while nylon materials have the disadvantages of high hygroscopicity, reduced impact resistance in dry environments, and difficult processing.

Among the metal materials, the most common material used to make chair legs is aluminum alloy, which has the advantages of light weight, high strength and good weather resistance. The sanding rod further sands the chair legs to make the surface fine and bright. At present, most of the existing chair legs are manually sanded to a sander equipped with sandpaper, and the sides, rounded corners, planes, and positions of the middle holes of the chair legs are artificially sanded, which has high processing intensity and low processing efficiency.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides an automatic and efficient grinding method for the legs of an office chair.

In order to achieve the above purpose, the present invention adopts the following technical solutions: a method for grinding office chair legs, which automatically grinds office chair legs through an assembly line, the assembly line includes a feeding station, a feeding station, a clamping station, End grinding station, side grinding station, center grinding station, joint grinding station and collection station, the grinding steps include:

a. Place the chair legs to be processed on the feeding station;

b. Take out a single chair leg from the feeding station through the feeding station;

c. Fix the chair legs taken out of the feeding station by the clamping station; the clamping station includes a turntable, a plurality of clamping rods evenly arranged on the rotary table, and a clamping plate matched with the clamping rods , the first driving member that drives the clamping plate to move and the second driving member that drives the clamping rod to move up and down, then the specific clamping steps are: rotating the turntable, so that the clamping rod is located just above the center of the chair foot, and then The clamping rod is moved down by the second driving member, and the clamping rod is inserted into the central ring of the chair foot, and then the clamping plate is moved by the first driving member, so that the clamping plate fits in the central ring of the chair foot;

d. Grind the end of the chair leg through the end grinding station. The end grinding assembly includes a worktable, a drum with a slot, a third driving member that drives the drum to rotate, and a a first fixing frame, a first fixing plate symmetrically arranged on the first fixing frame, a first rotating shaft arranged on the first fixing plate up and down correspondingly, and a first drive arranged on the first fixing plate a shaft, a first chute set on the first fixing plate, a first elastic piece set in the first chute, a first sliding block set at the end of the first elastic piece, a sleeve set The first abrasive belt on the first rotating shaft and the first driving shaft and the fourth driving member that drives the first driving shaft to rotate, then the specific end grinding step is: moving the clamping rod down by the first driving member to move the chair The feet are inserted into the grooves of the rotating drum, and the rotating drum is rotated so that the end of one foot of the chair foot faces the first abrasive belt, and then the first fixing frame is moved, so that the first abrasive belt is wrapped around the end of the foot of the chair foot. , and then drive the first abrasive belt to rotate through the fourth drive member. After grinding the foot of one of the chair legs, move the first fixing frame back, and then rotate the drum, so that the foot of the unpolished chair foot is facing the first sand. belt, repeat the above operation;

e. Grind the side of the chair leg through the side grinding station;

f. Grind the center ring of the chair foot through the center grinding station;

g. Grind the connection between the support foot of the chair foot and the central ring through the joint grinding station;

h. Collect the polished chair feet through the collection station; the chair feet can be automatically clamped and fixed on the clamping rod through the feeding station and the clamping station, and then the chair feet can be moved to the end in turn by rotating the turntable The grinding station, the side grinding station, the center grinding station and the joint grinding station can automatically grind all parts of the chair foot without manual adjustment of the position of the chair foot, which reduces the labor intensity and improves the processing efficiency.

The discharging station includes a discharging tray, a plurality of first sliding rails evenly arranged on the discharging plate, a first conveying belt arranged in the first sliding rail, and a first conveying belt evenly arranged on the first conveying belt. the upper baffle plate, the driving roller that cooperates with the first conveyor belt, and the fifth driving member that drives the first driving roller to rotate; then the specific discharging steps are: align the legs of the chair feet with the first slide rails, respectively, Place the support feet on the uppermost baffle, then rotate the first conveyor belt to move the baffle down through the fifth driving member, and turn out the new baffle, and repeat the above operation; the adjacent chair feet can be separated by the baffle. The distance between the children is convenient for the subsequent insertion of the plug board to take the material.

The loading station includes a plug-in board, a sixth driving member that drives the plug-in board to move up and down, a second sliding rail that cooperates with the sixth driving member, and drives the sixth driving member to slide relative to the second sliding rail. The specific feeding steps are: first, move the plug board through the seventh drive member, insert the plug board under the chair legs, and then move the plug board up through the sixth drive member to drive the chair legs to move up, so that the The chair foot is released from the first slide rail, and then the inserting plate is moved by the seventh driving member, which drives the central ring of the chair foot to move directly below the clamping rod, which does not require manual placement, reduces labor intensity, and improves the performance of the chair. processing efficiency.

The side grinding station includes a third sliding rail, a first sliding plate matched with the third sliding rail, a first sliding plate driving member that drives the first sliding plate to move, a second sliding plate that can slide back and forth relative to the first sliding plate, and the like. the second rotating shaft, the third rotating shaft corresponding to the second rotating shaft, the fourth rotating shaft disposed above the second rotating shaft, the fourth rotating shaft driving component that drives the fourth rotating shaft to move left and right relative to the second slide plate, and the drive The fourth rotating shaft driving member rotated by the fourth rotating shaft, the second abrasive belt sleeved on the second rotating shaft, the third rotating shaft and the fourth rotating shaft, and the connecting component for connecting the second rotating shaft to the second sliding plate; The side grinding steps are: move the second sliding plate first, so that the second abrasive belt moves to the center ring of the chair foot, and then move the first sliding plate to the right to drive the second abrasive belt to move to the right, so that the second abrasive belt fits on the chair The surface of the foot of the foot, and then move the fourth shaft to the right, so that the second abrasive belt wraps half of the foot of the chair foot, and then drives the second shaft to rotate through the fourth shaft drive, driving the second abrasive belt to grind the side of the chair foot, and at the same time Gradually move the second sliding plate, when the second abrasive belt is separated from the foot of the chair foot, repeat the above operation to grind the other half side of the foot of the chair foot; when grinding the side of the foot, there is no need to rotate the chair foot, so that the second sand The belt always wraps half of the feet, sanding is more even and the sanding effect is better.

The connecting assembly includes a second sliding groove set in the second sliding plate, a sliding rod set in the second sliding groove, a second sliding block matched with the sliding rod, and a first sliding rod sleeved on the sliding rod. Two elastic members, the second sliding block is rotatably connected with the second rotating shaft; during the movement of the fourth rotating shaft, the second sliding block will receive the pulling force of the second rotating shaft and the pulling force of the second elastic member at the same time, and then automatically adjust the sliding The position of the block allows the second abrasive belt to be attached to the surface of the foot of the chair foot, and can also keep the second abrasive belt in tension all the time, so as to ensure the grinding effect of the second abrasive belt.

The center grinding station includes a second fixing frame, a fifth rotating shaft symmetrically arranged on the second fixing frame, a third abrasive belt sleeved on the fifth rotating shaft, and a fifth rotating shaft that drives the fifth rotating shaft to rotate. A rotating shaft driving member and a second fixing frame driving member that drives the second fixing frame to move; the specific center grinding step is: moving the second fixing frame forward through the second fixing frame driving member, so that the second abrasive belt moves to the chair foot Above the central ring, then move the clamping rod upwards, so that the central ring of the chair foot contacts the third abrasive belt, and then drives the third abrasive belt to rotate and grind the chair foot through the fifth rotating shaft driving member.

The joint grinding station includes a fixed column arranged on the worktable, a clamping plate evenly arranged on the fixed column, a rotating column evenly arranged on the upper end of the fixed column, and a rotating column evenly arranged on the rotating column. The socket on the column, the grinding rod that cooperates with the socket, and the rotating column driving member that drives the rotating column to rotate; the specific steps of grinding the joint are: move the clamping rod down, and clip the legs of the chair feet into the Between the card boards, insert the corresponding grinding rod according to the distance between the adjacent feet, so that the grinding rod can contact the connection of the feet, and then rotate the rotating column, so that the grinding rod is constantly in contact and friction with the connection of the feet; it is convenient for different Large and small chair legs are processed, and when the grinding rod is grinding the joint, it also rotates to a certain extent, so that the contact position between the grinding rod and the joint changes constantly, and the service life of the grinding rod is improved.

The collection station includes a collection plate, a collection drive member that drives the collection plate to move up and down, a fourth slide rail that cooperates with the collection drive member, a collection rack, and a collection drive member that drives the collection drive member to slide relative to the fourth slide rail. Then the specific collection steps are: move the collecting plate through the collecting drive so that the collecting plate is located directly under the chair foot, and then move the clamping plate through the first driving part, so that the clamping plate is no longer in contact with the chair foot, and the chair The feet fall on the collection board, and then the collection board is moved by the moving driving part, the insertion board is moved to the top of the collection rack, the collection board is moved down, and the chair feet are placed on the collection rack.

To sum up, through the feeding station and the clamping station, the chair legs can be automatically clamped and fixed on the clamping rod, and then the chair legs can be moved to the end grinding station, side grinding station, The center grinding station and the joint grinding station can automatically grind each part of the chair foot without manual adjustment of the position of the chair foot, which reduces the labor intensity and improves the processing efficiency.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an enlarged view of part A of FIG. 1 .

FIG. 3 is an enlarged view of part B of FIG. 1 .

4 is a cross-sectional view of the present invention.

FIG. 5 is an enlarged view of part A of FIG. 4 .

FIG. 6 is an enlarged view of part B of FIG. 4 .

FIG. 7 is an internal structure diagram of the present invention.

FIG. 8 is an enlarged view of part A of FIG. 7 .

Figure 9 is a rear view of the present invention.

FIG. 10 is an enlarged view of part A of FIG. 9 .

Detailed ways

As shown in Figure 1-10, a method for grinding the legs of an office chair is to automatically polish the legs of the office chair through an assembly line, and the assembly line includes a feeding station, a feeding station, a clamping station, and an end grinding station. The grinding steps include:

a. Place the chair legs to be processed on the feeding station;

b. Take out a single chair leg from the feeding station through the feeding station;

c. Fix the chair legs taken out from the feeding station by the clamping station;

d. Grind the end of the chair foot through the end grinding station;

e. Grind the side of the chair leg through the side grinding station;

f. Grind the center ring of the chair foot through the center grinding station;

g. Grind the connection between the support foot of the chair foot and the central ring through the joint grinding station;

h. Collect the polished chair legs through the collection station;

The discharging station includes a discharging tray 1, a first sliding rail 11, a first conveyor belt 12, a baffle 13, a driving roller and a fifth driving member. The discharging tray 1 is a disc, and the first sliding The rail 11 is made of long boards with grooves, the number of which is 5, and is evenly fixed on the periphery of the discharge tray. The first conveyor belt 12 is a conventional conveyor belt, which is sleeved on the driving roller, the fifth driving member is a motor, and its output shaft is fixed at the end of the driving roller, and the baffle plate 13 is uniformly fixed on the first conveyor belt 12. Then, align the feet of the chair feet with the first slide rail respectively, so that the feet are placed on the uppermost baffle, and then rotate the first conveyor belt to move the baffle down through the fifth driving member, and turn out the new baffle, and repeat the above. Operation; through the baffle, the adjacent chair legs can be separated by the Fairchild distance, which is convenient for the subsequent insertion of the plug board to take the material.

The loading station includes a worktable 19 , an insert plate 15 , a sixth driving member 16 , a second sliding rail 17 and a seventh driving member 18 . The second sliding rail 17 is fixed on the worktable 19 , and the first The six driving members 16 are air cylinders, which are arranged on the second sliding rail 17 through the base, and the base can slide relative to the second sliding rail. If the air cylinder is selected, the output end of which is fixed on the base of the sixth driving member, then the plug board is first moved by the seventh driving member, and the plug board is inserted under the chair foot, and then the plug board is moved upward by the sixth driving member to drive the chair foot. Move up to make the chair legs come out from the first slide rail, and then move the insert plate through the seventh drive member, which drives the center ring of the chair legs to move directly below the clamping rod, which does not require manual placement and reduces labor intensity. , and improve the processing efficiency.

The clamping station includes a turntable 2, a clamping rod 21, a clamping plate 22, a first driving member 23, a second driving member 24, a rotating shaft 25, and a rotating shaft driving member 26. The rotating shaft driving member 26 uses a motor, so Described rotating shaft 25 is fixed on the output shaft of the rotating shaft drive member, described turntable 2 selects the disc for use, is fixed on the top end of the rotating shaft, and described second drive member 24 selects the cylinder for use, and is rotatably connected on the bottom surface of the turntable, and the number is preferably 6, so The clamping rod 21 is fixed on the output end of the second driving member, the first driving member 23 is fixed on the bottom end of the clamping rod by using a hydraulic cylinder, and the clamping plate 22 is an arc plate, which is fixed on the first driving member. the output end of the seat, then turn the turntable so that the clamping rod is located just above the center of the chair foot, and then move the clamping rod down by the second driving member, insert the clamping rod into the center ring of the chair foot, and then pass the first driving member to move the clamping rod down. The parts move the clamping plate so that the clamping plate fits in the center ring of the chair foot, which is convenient for clamping and fixing the chair feet of different sizes.

The end grinding station includes a rotating drum 3, a third driving member 31, a first fixing frame 32, a first fixing plate 33, a first rotating shaft 34, a first driving shaft 35, a first chute 36, a first elastic 37, the first sliding block, the first abrasive belt 39 and the fourth driving member 391, the third driving member 31 selects a motor and is fixed on the worktable, and the rotating drum 3 is fixed on the output shaft of the third driving member The rotating drum is evenly provided with 5 slots, the first fixing frame 32 is driven by the cylinder to move forward and backward, the first fixing plate 33 is symmetrically fixed on the first fixing frame, and the first chute 36 Opened on the first fixing plate, the first elastic member 37 selects elastic telescopic rods and is fixed in the first chute 36, the first sliding block is fixed on the upper end of the first elastic member, and the first rotating shaft 34 has two sides. The ends are respectively fixed on the first sliding block, the two ends of the first drive shaft 35 are respectively connected to the first fixing plate in rotation, and the first abrasive belt 39 is a conventional abrasive belt, which is sleeved on the first rotating shaft and the first fixed plate. On the drive shaft, the fourth drive member 391 selects a motor, and its output shaft is fixed at the end of the first drive shaft, then the first drive member moves down the clamping rod to clamp the chair foot into the slot of the drum, Rotate the rotating drum to make one of the legs of the chair feet face the first abrasive belt, and then move the first fixing frame, so that the first abrasive belt is wrapped around the end of the leg of the chair foot, and then drive the first abrasive belt through the fourth driving member. When the belt is rotated, after grinding the foot of one of the chair legs, move the first fixing frame back, and then rotate the drum, so that the foot of the unpolished chair foot is facing the first abrasive belt, and repeat the above operation; by setting the first elastic It not only facilitates the deformation of the first abrasive belt to wrap the end of the foot, but also ensures that the first abrasive belt is kept in tension to ensure the grinding effect.

The side grinding mechanism includes a third sliding rail 4, a first sliding plate 41, a first sliding plate driving member, a second sliding plate 42, a second rotating shaft 43, a third rotating shaft 44, a fourth rotating shaft 45, a fourth rotating shaft driving member 46, The second abrasive belt 47, the second sliding groove, the sliding rod 48, the second sliding block 481, the second elastic member 49, the through groove, the driving plate 451 and the driving tooth 452, the third sliding rail 4 is fixed on the worktable , the first sliding plate 41 can slide relative to the third sliding rail, the first sliding plate driving member is a cylinder, and its output end is fixed on the first sliding plate, the second sliding plate 42 can slide relative to the first sliding plate, the The second sliding groove is opened on the second sliding plate, the two ends of the sliding rod 48 are respectively fixed on both ends of the first sliding groove, the second sliding block 481 is penetrated on the sliding rod 48, and the second elastic member 49 Springs are selected, which are respectively sleeved on both ends of the sliding rod, one end of which is fixed on the second sliding block, and the other end is fixed on the second sliding groove. The second rotating shaft 43 is rotatably connected to the second sliding block. The slot is opened on the second sliding plate, and the upper and lower sides of the driving plate 451 are fixed with racks, which are arranged in the through grooves. The four rotating shafts 45 are rotatably connected to the drive plate. The fourth rotating shaft driving part uses a motor first, and its output shaft is fixed at the end of the fourth rotating shaft. The second abrasive belt is a conventional abrasive belt, which is sleeved on the first On the second rotating shaft, the third rotating shaft and the fourth rotating shaft, the specific side grinding steps are as follows: first move the second sliding plate to move the second abrasive belt to the center ring of the chair foot, and then move the first sliding plate to the right to drive the second sliding plate Move the abrasive belt to the right to make the second abrasive belt fit on the surface of the foot of the chair foot, and then move the fourth rotating shaft to the right, so that the second abrasive belt wraps half of the foot of the chair foot, and then drives the second rotating shaft through the fourth rotating shaft driver Rotate, drive the second abrasive belt to grind the side of the chair foot, and at the same time gradually move the second sliding plate, when the second abrasive belt is separated from the foot of the chair foot, repeat the above operation to grind the other half of the side of the foot of the chair foot; When grinding on the side, there is no need to turn the chair feet, so that the second abrasive belt always wraps half of the feet, the grinding is more uniform, and the grinding effect is better; and when the fourth rotating shaft is moving, the second sliding block will be affected by the second rotating shaft at the same time. The tension of the second elastic member and the tension of the second elastic member, and then automatically adjust the position of the slider, so that the second abrasive belt can be attached to the surface of the chair foot, and the second abrasive belt can be kept in tension all the time to ensure the second abrasive belt. Sanding effect.

The center grinding station includes a second fixing frame 5, a fifth rotating shaft, a third abrasive belt 51, a fifth rotating shaft driving member 52 and a second fixing frame driving member 53, and the second fixing member driving member 53 uses a cylinder, Fixed on the workbench, the second fixed frame 5 is fixed on the output end of the second fixed frame drive member, the fifth rotating shaft is symmetrically arranged on the second fixed frame, and both ends of the fifth rotating shaft are respectively rotatably connected to the second fixed frame. On the fixing frame, the fifth rotating shaft driving member 52 selects a motor, and its output shaft is fixed on the end of the fifth rotating shaft. The specific center grinding steps are: move the second fixing frame forward through the second fixing frame driving member, so that the second fixing frame is moved forward. The abrasive belt is moved to the top of the center ring of the chair foot, and then the clamping rod is moved up, so that the center ring of the chair foot is in contact with the third abrasive belt, and then the third abrasive belt is driven to rotate by the fifth shaft drive to grind the chair foot.

The joint grinding station includes a fixed column 6, a clamping plate 61, a rotating column 62, an insertion hole 63, a grinding rod 64 and a rotating column driving member. The fixed column 6 is fixed on the workbench, and the clamping plate 61 is uniform. It is stipulated at the top of the fixed column, five of the rotating columns 62 are selected and evenly distributed on the fixed column. Two rows of the sockets 63 are evenly opened on the rotating column, and the two columns of sockets are distributed in an X shape. The grinding rods 64 Use a conventional grinding rod, which can be inserted into the jack. The rotating column driving part is a motor, and the specific steps for grinding the joint are: move the clamping rod down, and clamp the legs of the chair feet into the clamping plates respectively. The size of the distance between the adjacent feet is inserted into the corresponding grinding rod, so that the grinding rod can be in contact with the connection of the feet, and then the rotating column is rotated, so that the grinding rod is constantly in contact and friction with the connection of the feet; it is convenient to process chair feet of different sizes, Moreover, when the grinding rod is grinding the joint, it also rotates to a certain extent, so that the contact position between the grinding rod and the joint is constantly changed, and the service life of the grinding rod is improved.

The collecting station includes a collecting plate 7, a collecting plate driving member 71, a fourth sliding rail 72, a collecting frame 73 and a moving driving member. The collecting plate driving member 71 selects a cylinder and can slide relative to the fourth sliding rail. The collecting plate 7 is fixed on the output end of the collecting plate driving member. The structure of the collecting rack is the same as that of the discharging station. The specific structure will not be repeated too much. The plate is located directly under the chair foot, and then the clamping plate is moved by the first driving member, so that the clamping plate is no longer in contact with the chair foot, and the chair foot falls on the collecting plate, and then the collecting plate is moved by the moving driving member, and the insertion plate is removed. Move over the collection rack, lower the collection plate, and place the chair feet on the collection rack.

Claims (8)

1. a method for grinding office chair legs, it is characterized in that, the office chair legs are automatically polished by an assembly line, and the assembly line comprises a discharging station, a feeding station, a clamping station, an end grinding station, For the side grinding station, the center grinding station, the joint grinding station and the collecting station, the grinding steps include: a. Place the chair legs to be processed on the unloading station; b. The chair legs are taken out from the feeding station; c. The chair legs taken out from the feeding station are fixed by the clamping station; the clamping station includes a turntable (2), and a plurality of a clamping rod (21), a clamping plate (22) that cooperates with the clamping rod, a first driving member (23) that drives the clamping plate to move, and a second driving member (23) that drives the clamping rod to move up and down If the driving member (24) is used, the specific clamping steps are as follows: rotate the turntable so that the clamping rod is located just above the center of the chair foot, and then move the clamping rod down through the second driving member, and insert the clamping rod into the center ring of the chair foot. inside, and then move the clamping plate through the first driving member to make the clamping plate fit in the center ring of the chair foot; d. The end of the chair foot is polished by the end polishing station, and the end polishing component includes: A workbench (19), a drum (3) provided with a slot, a third driving member (31) for driving the drum to rotate, a first fixing frame (32) that can move back and forth, symmetrically arranged on the A first fixing plate (33) on a fixing frame, a first rotating shaft (34) arranged on the first fixing plate up and down correspondingly, a first driving shaft (35) arranged on the first fixing plate, A first chute (36) provided on the first fixing plate, a first elastic piece (37) provided in the first chute, and a first sliding piece provided at the end of the first elastic piece block, a first abrasive belt (39) sleeved on the first rotating shaft and the first driving shaft, and a fourth driving member (391) that drives the first driving shaft to rotate, the specific end grinding steps are: A driving part moves down the clamping rod to clamp the chair foot into the groove of the rotating drum, rotate the rotating drum so that one of the legs of the chair foot is facing the first abrasive belt, and then move the first fixing frame, so that the first The abrasive belt is wrapped around the end of the foot of the chair foot, and then the first abrasive belt is driven to rotate by the fourth driving member. After grinding the foot of one of the chair feet, the first fixing frame is moved back, and then the rotating drum is rotated to make the unpolished The feet of the chair feet are facing the first abrasive belt, and the above operations are repeated; e. Grind the side of the chair foot through the side grinding station; f. Grind the center ring of the chair foot through the center grinding station; g. By connecting Grind the connection between the support feet of the chair feet and the central ring at the grinding station; h. Collect the polished chair feet through the collecting station. 2. A method for grinding the legs of an office chair according to claim 1, characterized in that: the discharging station comprises a discharging tray (1), a plurality of A first sliding rail (11), a first conveyor belt (12) arranged in the first sliding rail, a baffle plate (13) evenly arranged on the first conveyor belt, and a The driving roller and the fifth driving member that drives the driving roller to rotate; the specific discharging steps are as follows: align the legs of the chair legs with the first slide rail, so that the legs are placed on the uppermost baffle, and then pass through the fifth The driving member rotates the first conveyor belt to move down the baffle, and rotates out the new baffle, and repeats the above operations. 3. A method for grinding the legs of an office chair according to claim 1, characterized in that: the loading station comprises an insert plate (15), a sixth driving member (16) that drives the insert plate to move up and down , a second sliding rail (17) that cooperates with the sixth driving member and a seventh driving member (18) that drives the sixth driving member to slide relative to the second sliding rail; the specific feeding steps are: The seven driving parts move the plug board, insert the plug board under the chair feet, and then move the plug board up through the sixth driving part, and drive the chair feet to move up, so that the chair feet are disengaged from the first slide rail, and then pass through the seventh driving part. Move the insert plate to drive the center ring of the chair foot to move directly below the clamping rod. 4. A method for grinding office chair legs according to claim 1, wherein the side grinding station comprises a third sliding rail (4) and a first sliding plate (41) matched with the third sliding rail , a first sliding plate driving member that drives the first sliding plate to move, a second sliding plate (42) that can slide back and forth relative to the first sliding plate, a second rotating shaft (43) arranged on the second sliding plate, and the second sliding plate (43) A third rotating shaft (44) corresponding to the two rotating shafts, a fourth rotating shaft (45) disposed above the second rotating shaft, a fourth rotating shaft driving assembly for driving the fourth rotating shaft to move left and right relative to the second slide plate, and driving the fourth rotating shaft (45) A fourth rotating shaft driving member (46) rotating with four rotating shafts, a second abrasive belt (47) sleeved on the second rotating shaft, the third rotating shaft and the fourth rotating shaft, and a connecting assembly for connecting the second rotating shaft to the second sliding plate ; Then the specific side grinding steps are: first move the second sliding plate to move the second abrasive belt to the center ring of the chair foot, then move the first sliding plate to the right, drive the second abrasive belt to move to the right, and make the second abrasive belt stick It is closed on the surface of the foot of the chair foot, and then the fourth rotating shaft is moved to the right, so that the second abrasive belt wraps the foot of the chair foot in half, and then the second rotating shaft is driven to rotate by the fourth rotating shaft driver, which drives the second abrasive belt to the side of the chair foot. While grinding, gradually move the second sliding plate, when the second abrasive belt is separated from the feet of the chair feet, repeat the above operation to grind the other half of the side surfaces of the feet of the chair feet. 5. A method for grinding office chair legs according to claim 4, characterized in that: the connecting component comprises a second chute provided in the second sliding plate (42), a second chute provided in the second sliding plate (42) A sliding rod (48) in the chute, a second sliding block (481) matched with the sliding rod, and a second elastic member (49) sleeved on the sliding rod, the second sliding block is rotatably connected with the second rotating shaft . 6. A method for grinding the legs of an office chair according to claim 1, wherein the center grinding station comprises a second fixing frame (5), a fifth fixing frame symmetrically arranged on the second fixing frame A rotating shaft, a third abrasive belt (51) sleeved on the fifth rotating shaft, a fifth rotating shaft driving member (52) that drives the fifth rotating shaft to rotate, and a second fixed frame driving member that drives the second fixed frame to move (53); the specific center grinding steps are: move the second fixing frame forward through the second fixing frame driving part, so that the second abrasive belt moves to the top of the center ring of the chair foot, and then move the clamping rod upward, so that the chair foot The center ring is in contact with the third abrasive belt, and then drives the third abrasive belt to rotate and grind the chair legs through the fifth rotating shaft driving member. 7. A method for grinding the legs of an office chair according to claim 1, characterized in that: the joint grinding station comprises a fixed column (6) arranged on the worktable, uniformly arranged on the fixed column A clamping plate (61) on the column, a rotating column (62) evenly arranged on the upper end of the fixed column, an insertion hole (63) evenly arranged on the rotating column, and a grinding rod (63) matched with the insertion hole 64) and the rotating column driving member that drives the rotating column to rotate; the specific steps for grinding the joint are: move the clamping rod down, insert the legs of the chair feet into the clamping plates respectively, and insert them according to the distance between the adjacent legs. Corresponding grinding rods are used so that the grinding rods can be in contact with the joints of the feet, and then the rotating column is rotated so that the grinding rods are constantly in contact and friction with the joints of the feet. 8. A method for grinding the legs of an office chair according to claim 1, characterized in that: the collecting station comprises a collecting plate (7), a collecting driving member (71) that drives the collecting plate to move up and down, and The fourth slide rail (72), the collection rack (73) that the collection driving member cooperates with, and the moving driving member that drives the collection driving member to slide relative to the fourth sliding rail; the specific collection step is: moving the collection driving member through the collection driving member. Then the first driving member moves the clamping plate so that the clamping plate is no longer in contact with the chair foot, and the chair foot falls on the collecting plate, and then the collecting plate is moved by the moving driving member , move the insert plate above the collection rack, move the collection plate down, and place the chair feet on the collection rack.

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