Automatic exchange workbench

Abstract

The present invention relates to the technical field of numerical control machine tool equipment, and specifically to an automatic exchange workbench, including an exchange table, a main workbench seat and a sub-workbench seat are respectively installed on both sides of the exchange table, and workbenches are placed on the main workbench seat and the sub-workbench seat; the exchange table includes a first shell, a first worm and a central shaft are installed in the first shell, a first turbine that can rotate and mesh with the first worm is installed on the central shaft, a lifting cylinder is fixedly installed on the top of the first turbine, the lifting cylinder is rotatably matched with a receiving member fixed on the top of the first shell, an outer gear ring is fixedly installed on the outer wall of the lifting cylinder, the outer gear ring is meshed with a gear sleeve installed on a support plate, and the gear sleeve is also fixedly connected to the lifting piston of the lifting cylinder. The present invention adopts the rotation of the worm to realize the exchange of the positions of two workbenches, and the motor structure is more compact than the cylinder, so the structure of the double exchange workbench can be made more compact.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machine tool equipment, and in particular to an automatic exchange workbench. Background Art

[0002] Traditional CNC machine tools have only one workbench. When the workpiece on the workbench is processed, it will be idle until the next workpiece is installed, and the work efficiency is low. Therefore, the exchange workbench appears. The exchange workbench refers to a workbench with two or more workpieces that can be independently installed and work in rotation. When the workpiece on one of the workbenches is being processed, the other workbench can be used to install or remove other workpieces. When a workpiece is processed, the two workbenches only need to rotate to complete the position exchange to complete the workpiece exchange.

[0003] Among them, the double exchange workbench is widely used. The structure of the double exchange workbench is mostly the same as the double exchange workbench provided by the Chinese utility model patent with application number CN202123055432.7 and name "A fully automatic exchange workbench exchange positioning mechanism". The exchange of the two workbenches is driven by the power cylinder to move the rack, and the rack drives the power gear installed on the main shaft to rotate, thereby realizing the exchange of the positions of the two workbenches.

[0004] This double exchange workbench driven by an oil cylinder requires an additional set of matching hydraulic pipelines, which increases the complexity of the structure and also increases the cost. In addition, the power cylinder is installed on the outside of the rotating structure. Since the power cylinder is relatively long, this greatly increases the structural size of the double exchange workbench. Summary of the invention

[0005] In order to solve the problems in the prior art, the present invention provides an automatic exchange workbench, which is specifically implemented through the following technical solutions.

[0006] An automatic exchange workbench comprises an exchange table, wherein a main workbench seat and an auxiliary workbench seat are respectively installed on both sides of the exchange table, and workbenches are placed on the main workbench seat and the auxiliary workbench seat; the exchange table comprises a first outer shell, wherein a first worm and a central shaft are installed in the first outer shell, and a first turbine which can rotate and mesh with the first worm is installed on the central shaft, and a lifting cylinder is fixedly installed on the top of the first turbine, and the lifting cylinder is rotatably matched with a receiving part fixed on the top of the first outer shell, and an outer gear ring is fixedly installed on the outer wall of the lifting cylinder, and the outer gear ring is meshed with a gear sleeve installed on a support plate, and the gear sleeve is also fixedly connected to the lifting piston of the lifting cylinder; the support plate can lift the workbenches on the main workbench seat and the auxiliary workbench seat at the same time.

[0007] The top of the first turbine is fixedly connected to the rotating shaft, the bottom of the lifting cylinder is fixedly installed with a connecting plate, the connecting plate is fixedly connected to the rotating shaft, and the rotating shaft is rotatably matched with the central axis.

[0008] The connecting plate is rotatably matched with the receiving member.

[0009] A first retaining frame is installed between the connecting plate and the receiving member, a plurality of first rollers are installed on the first retaining frame, and the first rollers are in rolling fit with the connecting plate and the receiving member.

[0010] A second retaining frame is also provided on the side of the connecting plate away from the receiving member, and a plurality of second rollers are installed on the second retaining frame; it also includes a pressure ring for limiting the second retaining frame, the pressure ring is fixedly connected to one end of the upper cover, and the other end of the upper cover is fixedly connected to the receiving member, and the second rollers are rollingly matched with the pressure ring and the connecting plate.

[0011] The receiving part includes a first supporting ring, a first connecting ring, a first limiting ring, and a second supporting ring which are fixed on the first outer shell in sequence from the outside to the inside; the first roller and the second supporting ring are rollingly matched; the inner diameter of the first limiting ring matches the outer diameter of the first retaining frame; and the first connecting ring is fixedly connected to the upper cover.

[0012] The central shaft is hollow and is dynamically sealed with the lifting cylinder.

[0013] The first housing is provided with a telescopic displacement sensor for sensing the travel of the support plate.

[0014] The main working table includes a second outer shell, in which a first main shaft and a second worm are rotatably installed, the second worm is meshed with a second turbine fixedly installed on the first main shaft, a first rotating seat is fixedly installed on the top of the first main shaft, a plurality of first positioning columns are fixedly installed in a circular array on the top of the first rotating seat, a telescopic blow pipe is installed inside the first positioning column, a plurality of air outlets are provided on the side wall of the telescopic blow pipe, and a plurality of steel balls are provided on the side wall of the first positioning column.

[0015] The auxiliary working table includes a third shell, a second main shaft is rotatably installed inside the third shell, the top of the second main shaft is fixedly connected to the second rotating seat, a positioning cylinder is also fixedly installed on the third shell, the second rotating seat is provided with a plurality of limiting holes matching the positioning cylinder, and a plurality of second positioning columns are fixedly installed on the top of the second rotating seat in a circular array.

[0016] The present invention has the following beneficial technical effects:

[0017] The present invention adopts a motor to drive the worm to rotate, and the worm drives the turbine to rotate, so as to realize the exchange of the positions of the two workbenches. The motor structure is more compact than the oil cylinder, so the structure of the double exchange workbench can be made more compact.

[0018] Since it is driven by an electric motor, no other supporting equipment such as hydraulic pipelines is required, which greatly simplifies the structure and reduces costs. In addition, the control accuracy of the motor is better than that of the cylinder.

[0019] The drive assembly of the present invention has a simple structure, and the turbine and the lifting cylinder are designed as an integrated unit, which makes the structure more compact. Moreover, the installation between the entire drive assembly and the first shell is simple. It can be directly placed on the first shell and then pressed by the upper shell without the need for an additional connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0021] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0022] Figure 3 The structure of the present invention is schematically shown Figure 3 ;

[0023] Figure 4 is a schematic diagram of the structure of the shell;

[0024] Figure 5 Schematic diagram of the structure of the rotating component Figure 1 ;

[0025] Figure 6 Schematic diagram of the structure of the rotating component Figure 2 ;

[0026] Figure 7 Schematic diagram of the structure of the rotating component Figure 3 ;

[0027] Figure 8 It is a structural schematic diagram of the pressure ring;

[0028] Fig. 9 It is a structural schematic diagram of the pallet;

[0029] Fig.10 This is a schematic diagram of the structure of the main workbench.

[0030] In the figure, 1-exchange table, 101-first housing, 102-second mounting groove, 103-first support ring, 104-first connecting ring, 105-first limiting ring, 106-second support ring, 107-central shaft, 108-first motor reducer unit, 109-guide column, 110-first bearing seat, 111-first worm rod, 112-first turbine, 113-rotating shaft, 114-connecting plate, 115-pressure ring, 1151-pressure ring body, 1152-second limiting ring, 116-outer gear ring, 117-lifting cylinder, 118-lifting piston, 119-guide sleeve, 120-first retaining frame, 121-first roller, 122-second retaining frame, 123-second roller, 124-second connecting ring;

[0031] 2-main workbench, 201-second housing, 202-second bearing seat, 203-third support ring, 204-first rotating seat, 205-first positioning column, 206-telescopic blowpipe, 207-steel ball, 208-first main shaft, 209-second motor reducer unit; 210-second worm gear;

[0032] 3-first working table, 301-first positioning sleeve, 302-first seat body, 303-first table plate;

[0033] 4-support plate, 401-through hole, 402-tooth sleeve, 403-support plate body, 404-support fork;

[0034] 5-second workbench; 501-second positioning sleeve, 502-second seat body, 503-second table;

[0035] 6- auxiliary workbench, 601- third shell, 602- second rotating seat, 603- second positioning column, 604- positioning cylinder;

[0036] 7- Telescopic displacement sensor. DETAILED DESCRIPTION

[0037] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0038] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be direct installation or indirect installation; "fixed installation" and "fixed connection" can be welding, riveting, interference fit, one-piece molding, bolt fixing and other conventional connection means in the field when there are special instructions. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] like Figures 1 to 10 As shown, the present invention provides an automatic exchange workbench, including an exchange table 1, a main workbench seat 2 and an auxiliary workbench seat 6 are respectively installed on both sides of the exchange table 1, a first workbench 3 is placed on the main workbench seat 2, and a second workbench 5 is placed on the auxiliary workbench seat 6.

[0040] A pallet 4 is installed at the output end of the exchange table 1, and both ends of the pallet 4 are provided with a fork 404, and the two forks 404 are respectively located below the first workbench 3 and the second workbench 5. The pallet 4 can lift the first workbench 3 and the second workbench 5, and rotate 180 degrees to complete the position exchange.

[0041] The structure of the switching station 1 is shown in the attached figure. Figure 4 To Attachment Figure 7 As shown, it includes a first housing 101, which is hollow inside and has a ring-shaped receiving member fixedly mounted on the top, and the receiving member is used to mount a rotating assembly of the driving support plate 4. A hollow central shaft 107 is mounted in the middle of the bottom of the first housing 101, and the axis of the central shaft 107 coincides with the axis of the receiving member.

[0042] For the structure of the receiving part, please refer to the attached Figure 4 , from outside to inside, they are the first support ring 103, the first connecting ring 104, the first limiting ring 105, and the second support ring 106, wherein the height of the first support ring 103 is greater than the height of the first limiting ring 105; the height of the first connecting ring 104 is equal to the height of the second supporting ring 106, and the heights of the first connecting ring 104 and the second supporting ring 106 are both less than the height of the first limiting ring 105. The first connecting ring 104 is provided with a plurality of first connecting holes (not shown) in an annular array.

[0043] A first worm rod 111 is also installed in the first housing 101, and both ends of the first worm rod 111 are rotatably installed on the first housing 101 through corresponding first bearing seats 110; one end of the first worm rod 111 passes through the first housing 101 and is fixedly connected to the output end of the first motor reducer unit 108 through a coupling, and the first motor reducer unit 108 is fixedly installed on one side of the first housing 101.

[0044] The structure of the rotating assembly is shown in the attached Figure 5 To Attachment Figure 8 As shown, it includes a rotating shaft 113, at the bottom of which a first turbine 112 is fixedly mounted, and the axis of the first turbine 112 coincides with the axis of the rotating shaft 113, and a hollow guide sleeve 119 is fixedly mounted at the bottom center position of the first turbine 112, and the inner diameter of the guide sleeve 119 matches the outer diameter of the center shaft 107.

[0045] The top of the rotating shaft 113 is provided with a plurality of second connection holes in a circumferential array, and the second connection holes correspond to the third connection holes provided on the connecting plate 114 one by one, and bolts are installed between the second connection holes and the third connection holes. The diameter of the connecting plate 114 is larger than the diameter of the rotating shaft 113.

[0046] The top of the connecting plate 114 is fixedly connected to the bottom of the lifting cylinder 117, and the aforementioned third connecting hole surrounds the periphery of the lifting cylinder 117. The diameter of the rotating shaft 113 is greater than the diameter of the lifting cylinder 117.

[0047] As attached Figure 7 As shown, a lifting piston 118 is installed in the lifting cylinder 117, and a second connecting ring 124 is fixedly installed on the top of the lifting piston 118. A plurality of fourth connecting holes are arranged in a circumferential array on the second connecting ring 124, and the fourth connecting holes are used to install the support plate 4. The top of the second connecting ring 124 is flush with the top of the cylinder body of the lifting cylinder 117.

[0048] An outer gear ring 116 is fixedly mounted on the outer wall of the lifting cylinder 117 , and the height of the outer gear ring 116 is smaller than that of the lifting cylinder 117 ; there are gaps between the top of the outer gear ring 116 and the top of the lifting cylinder 117 , and between the bottom of the outer gear ring 116 and the connecting plate 114 .

[0049] The diameter of the connecting plate 114 matches the outer diameter of the second supporting ring 106 .

[0050] The rotating assembly further includes a first retaining frame 120, which is located between the connecting plate 114 and the second supporting ring 106. A plurality of first rollers 121 are mounted on the first retaining frame 120, and the first rollers 121 are in rolling cooperation with the connecting plate 114 and the second supporting ring 106. Therefore, the rotating assembly can rotate freely on the second supporting ring 106. The first limiting ring 105 located outside the second supporting ring 106 limits the first retaining frame 120 to prevent the first retaining frame 120 from moving.

[0051] The rotating assembly further includes a second retaining frame 122, which is located on a side of the connecting plate 114 away from the second supporting ring 106, and a plurality of second rollers 123 are mounted on the second retaining frame 122. It also includes a pressing ring 115 for limiting the position of the second retaining frame 122, which includes a pressing ring body 1151, and a second limiting ring 1152 is fixedly mounted on the outer edge of the bottom of the pressing ring body 1151, and the inner diameter of the second limiting ring 1152 matches the outer diameter of the second retaining frame 122, so that the second retaining frame 122 will not be displaced after being installed.

[0052] The top of the pressure ring body 1151 is provided with a plurality of fourth connection holes in a circumferential array. An upper cover (not shown) is installed between the fourth connection hole and the first connection hole, that is, one end of the upper cover is fixedly connected to the first connection ring 104 by bolts, and the other end of the upper cover is fixedly connected to the pressure ring body 1151 by bolts, thereby fixing the pressure ring 115.

[0053] The aforementioned central shaft 107 passes through the guide sleeve 119, the first turbine 112, and the rotating shaft 113 in sequence, and then cooperates with the lifting cylinder 117 in a dynamic seal. The hollow central shaft 107 provides hydraulic oil to the lifting cylinder 117. The guide sleeve 119, the first turbine 112, the rotating shaft 113 and the central shaft 107 are rotatably matched.

[0054] The support plate 4 includes a support plate body 403, two support forks 404 are respectively located at the two ends of the support plate body 403, a gear sleeve 402 is fixedly installed at the top middle position of the support plate body 403 by bolts, and a top plate is provided on the top of the gear sleeve 402, and the top plate is connected to the second connecting ring 124 by bolts, so as to realize the fixed connection between the lifting piston 118 and the gear sleeve 402. The aforementioned gear sleeve 402 is installed on the support plate body 403 by bolts and meshes with the outer gear ring 116.

[0055] A guide column 109 is installed on the top of the first housing 101 by bolts. Specifically, a first installation slot is provided on the top of the first housing 101. The guide column 109 is provided with a first connecting portion matching the first installation slot. The first connecting portion is located in the first installation slot and fixedly connected by bolts. The guide column 109 is located on one side of the receiving member.

[0056] The support plate 4 is provided with two through holes 401 matching with the guide posts 109, and the two through holes 401 are respectively located on both sides of the gear sleeve 402 and on the extension line of a diameter of the gear sleeve 402. Therefore, after the support plate 4 rotates 180 degrees, there is still a guide post 109 plugged into the corresponding through hole 401. The guide post 109 can provide guidance for the lifting and lowering of the support plate 4, and can also limit the support plate 4 to prevent it from moving unnecessarily.

[0057] In order to prevent the situation that the support plate 4 is not lifted or lowered into place, a telescopic displacement sensor 7 is also installed on the first housing 101, and the telescopic end of the telescopic displacement sensor 7 can abut against the support plate 4, so that the telescopic displacement sensor 7 can detect the rising or falling distance of the support plate 4. Specifically, a second mounting groove 102 is provided on the top of the first housing 101, and a second connecting portion matching the second mounting groove 102 is provided on the telescopic displacement sensor 7. The second connecting portion is located in the second mounting groove 102 and is fixedly installed by bolts.

[0058] When the support plate 4 descends, the telescopic end of the telescopic displacement sensor 7 is compressed. When the support plate 4 rises, the telescopic end of the telescopic displacement sensor 7 returns to its original position as the support plate 4 rises.

[0059] The auxiliary workbench 6 includes a third shell 601, in which a second spindle is rotatably mounted, the top of the second spindle is fixedly connected to the second rotating seat 602, and the second rotating seat 602 and the third shell 601 are clearance-matched. A positioning cylinder 604 is also fixedly mounted on the third shell 601, and the output end of the positioning cylinder 604 is vertically upward. The second rotating seat 602 is provided with a plurality of limiting holes, and a first marking piece is installed at the position corresponding to the limiting hole on the outer wall of the second rotating seat 602, and a second marking piece matching the first marking piece is provided on the third shell 601. When the second rotating seat 602 needs to be rotated, the second rotating seat 602 is manually rotated to a predetermined angle, and then the positioning cylinder 604 is started, and the output end of the positioning cylinder 604 extends into the limiting hole to complete the positioning.

[0060] Four second positioning posts 603 are fixedly mounted on the top of the second rotating seat 602 in a circular array, and a second positioning sleeve 501 matching the second positioning posts 603 is provided on the second workbench 5. The top of the second positioning sleeve 501 is fixed to the bottom of the second seat body 502, and the top of the second seat body 502 is fixedly mounted on the bottom of the second table 503.

[0061] The main workbench 2 includes a second housing 201, in which a first main shaft 208 and a second worm 210 are rotatably mounted, and the second worm 210 is meshed with a second turbine fixedly mounted on the first main shaft 208. One end of the second worm 210 passes through the second housing 201 and is connected to the output end of the second motor reducer unit 209 through a coupling, and the second motor reducer unit 209 is fixedly mounted on the side wall of the second housing 201. The other end of the second worm 210 is mounted on the second housing 201 through a second bearing seat 202.

[0062] A first rotating seat 204 is fixedly mounted on the top of the first main shaft 208 , and the first rotating seat 204 is rotatably matched with a third supporting ring 203 fixedly mounted on the second housing 201 . For example, a slewing support may be installed between the third supporting ring 203 and the first rotating seat 204 .

[0063] Four first positioning columns 205 are fixedly installed in a circular array on the top of the first rotating seat 204. The first positioning columns 205 are hollow and a telescopic blow pipe 206 is installed inside. A plurality of air outlets are provided on the side wall of the telescopic blow pipe 206, and the telescopic blow pipe 206 is connected to an air source.

[0064] A plurality of steel balls 207 are disposed on the side wall of the first positioning column 205 , and the steel balls 207 can rotate freely.

[0065] The first workbench 3 can be mounted on the first positioning column 205 .

[0066] The first workbench 3 includes a first table 303, a first base 302 is installed at the bottom of the first table 303, a first positioning sleeve 301 matching the first positioning column 205 is fixedly installed at the bottom of the first base 302, and a guide groove matching the steel ball 207 is provided on the inner wall of the first positioning sleeve 301. A guide groove matching the steel ball 207 is also provided in the second positioning sleeve 501.

[0067] When the first workbench 3 is placed on the main workbench seat 2, the first positioning sleeve 301 is sleeved on the first positioning column 205, the steel ball 207 is located in the guide groove, the telescopic blowpipe 206 is pressed into the first positioning column 205, and the air outlet on the telescopic blowpipe 206 is blocked by the first positioning column 205. When the first workbench 3 leaves the main workbench seat 2, the telescopic blowpipe 206 pops out from the first positioning column 205, and the air outlet sprays air to blow away the iron filings near the first positioning column 205, preventing the second workbench 5 from being unable to be placed normally on the main workbench seat 2.

[0068] The telescopic blowpipe 206 can be telescoped by a spring installed between the first positioning column 205 , or can be ejected directly by the pressure of the airflow.

[0069] During the use of the device, the machine tool processes the workpiece of the first workbench 3 located on the main workbench seat 2. After the processing is completed, the controller controls the hydraulic pump to pass hydraulic oil into the lifting cylinder 117 through the central shaft 107, and the lifting piston 118 extends to drive the pallet 4 to rise, and the pallet 4 lifts the first workbench 3 and the second workbench 5. The telescopic displacement sensor 7 senses the height of the pallet 4. When the pallet 4 rises to a specified height, the controller starts the first motor reducer unit 108, and the first motor reducer unit 108 drives the first turbine 112 to rotate through the first worm 111, and the first turbine 112 drives the lifting cylinder 117 to rotate, and the lifting cylinder 117 drives the pallet 4 to rotate 180 degrees, and the first workbench 3 and the second workbench 5 exchange positions. Then the lifting cylinder 117 releases pressure, and the pallet 4 descends until the telescopic displacement sensor 7 senses that the pallet 4 has descended to a predetermined height, and the lifting cylinder 117 stops releasing pressure, completing the exchange of the final positions of the first workbench 3 and the second workbench 5. The main workbench seat 2 is used to drive the first workbench 3 or the second workbench 5 to rotate and adjust the orientation of the workpiece during the workpiece processing.

[0070] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic exchange workbench, characterized in that: The present invention comprises an exchange table (1), wherein a main workbench (2) and a sub-workbench (6) are respectively installed on both sides of the exchange table (1), and a workbench is placed on the main workbench (2) and the sub-workbench (6); the exchange table (1) comprises a first shell (101), wherein a first worm (111) and a central shaft (107) are installed in the first shell (101), and a first worm wheel (112) which can rotate and mesh with the first worm wheel (111) is installed on the central shaft (107), and the top of the first worm wheel (112) is fixed A lifting cylinder (117) is fixedly installed, the lifting cylinder (117) is rotatably matched with a receiving member fixed to the top of the first housing (101), an outer gear ring (116) is fixedly installed on the outer wall of the lifting cylinder (117), the outer gear ring (116) is meshed with a gear sleeve (402) installed on the support plate (4), and the gear sleeve (402) is also fixedly connected to a lifting piston (118) of the lifting cylinder (117); the support plate (4) is capable of simultaneously lifting the workbenches on the main workbench seat (2) and the auxiliary workbench seat (6); The top of the first worm gear (112) is fixedly connected to the rotating shaft (113), the bottom of the lifting cylinder (117) is fixedly mounted with a connecting plate (114), the connecting plate (114) is fixedly connected to the rotating shaft (113), and the rotating shaft (113) is rotatably matched with the central axis (107); The connecting plate (114) is rotatably matched with the receiving member; A first retaining frame (120) is installed between the connecting plate (114) and the receiving member, a plurality of first rollers (121) are installed on the first retaining frame (120), and the first rollers (121) are in rolling fit with the connecting plate (114) and the receiving member; A second retaining frame (122) is also provided on the side of the connecting plate (114) away from the receiving member, and a plurality of second rollers (123) are mounted on the second retaining frame (122); the second retaining frame (122) also includes a pressing ring (115) for limiting the position of the second retaining frame (122), the pressing ring (115) being fixedly connected to one end of the upper cover, the other end of the upper cover being fixedly connected to the receiving member, and the second rollers (123) rollingly cooperate with the pressing ring (115) and the connecting plate (114).

2. The automatic exchange workbench according to claim 1, characterized in that: The receiving component comprises a first supporting ring (103), a first connecting ring (104), a first limiting ring (105), and a second supporting ring (106) which are fixed on the first housing (101) in sequence from the outside to the inside; the first roller (121) and the second supporting ring (106) are rollingly matched; the inner diameter of the first limiting ring (105) matches the outer diameter of the first retaining frame (120); and the first connecting ring (104) is fixedly connected to the upper cover.

3. The automatic exchange workbench according to claim 1, characterized in that: The central shaft (107) is hollow and is dynamically sealed to the lifting cylinder (117).

4. The automatic exchange workbench according to claim 1, characterized in that: A telescopic displacement sensor (7) for sensing the travel of the support plate (4) is mounted on the first housing (101).

5. The automatic exchange workbench according to claim 1, characterized in that: The main working table (2) comprises a second outer shell (201), a first main shaft (208) and a second worm (210) are rotatably mounted inside the second outer shell (201), the second worm (210) is meshed with a second worm wheel fixedly mounted on the first main shaft (208), a first rotating seat (204) is fixedly mounted on the top of the first main shaft (208), a plurality of first positioning columns (205) are fixedly mounted on the top of the first rotating seat (204) in a circular array, a telescopic blowpipe (206) is mounted inside the first positioning column (205), a plurality of air outlets are arranged on the side wall of the telescopic blowpipe (206), and a plurality of steel balls (207) are arranged on the side wall of the first positioning column (205).

6. The automatic exchange workbench according to claim 1, characterized in that: The auxiliary workbench (6) includes a third shell (601), a second main shaft is rotatably installed inside the third shell (601), the top of the second main shaft is fixedly connected to the second rotating seat (602), a positioning cylinder (604) is also fixedly installed on the third shell (601), the second rotating seat (602) is provided with a plurality of limiting holes matching the positioning cylinder (604), and a plurality of second positioning columns (603) are fixedly installed on the top of the second rotating seat (602) in a circular array.

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