A switching worktable device and machining center

Abstract

The present application relates to a kind of exchange workbench device and machining center, wherein exchange workbench device includes pedestal, exchange arm and exchange drive assembly, the exchange drive assembly is used to drive the exchange arm lifting and rotating, conversion motion component for driving the exchange arm rotation is arranged in the pedestal, and lifting piece for driving the exchange arm lifting is arranged between the pedestal and the conversion motion component;The exchange drive assembly includes first lifting drive part and second lifting drive part, wherein the driving end of first lifting drive part is connected with the lifting piece, the second lifting drive part is at least partially located in the driving end of the first lifting drive part, and the driving end of the second lifting drive part is connected with the conversion motion component, solve the problem that the volume of exchange workbench is larger in prior art, and the versatility is poor.

Description

Technical Field

[0001] The present invention relates to the technical field of machining centers, and in particular to an exchange workbench device and a machining center. Background Art

[0002] Most machine tools today have only one workbench. For processing small parts, the time required to install the workpiece is relatively short and the impact is relatively small. However, for processing larger workpieces, the time to install the workpiece is relatively long. If there is still only one workbench in this case, it is bound to have a greater impact and slow down work efficiency. At present, a double workbench that can be rotated and exchanged is used. When one workbench is used for machine tool processing, the other workbench is used to install and fix new workpieces. By rotating and exchanging the workbench, the impact of the time-consuming problem of fixing workpieces on large machine tools is reduced. However, the existing exchange workbench requires a lifting motor and a rotating motor to realize the exchange function. Therefore, the volume is often large and it is difficult to fit the machine tool. In the existing technology, for example, in the patent announcement number CN216554728U and the patent name of a two-stage telescopic oil cylinder, a sliding first-stage piston rod and a second-stage piston rod are provided in the first cylinder body to realize two-stage telescopic extension, but it cannot meet the rotation function of the exchange table. Summary of the Invention

[0003] The main purpose of the present invention is to provide an exchange worktable device and a machining center, which solves the problem that the exchange worktable in the prior art is large in size and difficult to fit into the installation structure of various machine tools.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A first aspect: An exchange workbench device comprises a base, an exchange arm and an exchange drive assembly, wherein the exchange drive assembly is used to drive the exchange arm to lift and rotate, the base is provided with a conversion motion component for driving the exchange arm to rotate, and a lifting member arranged between the base and the conversion motion component for driving the exchange arm to lift; the exchange drive assembly comprises a first lifting drive part and a second lifting drive part, wherein the driving end of the first lifting drive part is connected to the lifting member, the second lifting drive part is at least partially located in the driving end of the first lifting drive part, and the driving end of the second lifting drive part is connected to the conversion motion component.

[0006] In a preferred embodiment of the present invention, the motion conversion component includes a conversion input end and a conversion output end, the conversion input end is connected to the driving end of the second lifting drive unit, and the conversion output end is connected to the exchange arm, and the motion conversion component is used to convert the linear motion input by the second lifting drive unit into rotational motion;

[0007] The conversion motion component is located in the lifting component, the bottom of the lifting component is fixed to the driving end of the first lifting drive part, and the lifting component is used to drive the conversion motion component to move up and down.

[0008] In a preferred embodiment of the present invention, the first lifting drive unit includes a first cylinder, a first piston, and a second cylinder. The first cylinder is axially provided with a mounting hole that cooperates with the second cylinder. The second cylinder is disposed through the mounting hole, and the first piston is located in the first cylinder. The first piston is fixedly connected to the outer wall of the second cylinder, and the periphery of the plug body of the first piston is tightly and slidably engaged with the inner cylinder wall of the first cylinder.

[0009] The outer wall of the second cylinder body is sealed and slidably matched with the hole wall of the mounting hole, and one end of the second cylinder body extends out of the first cylinder body and is connected to the lifting member.

[0010] In a preferred embodiment of the present invention, the second lifting drive unit includes a second piston and a telescopic rod, and the second piston is located in the second cylinder body; one end of the telescopic rod is fixedly connected to the second piston, and the other end passes through the second cylinder body and is fixedly connected to the conversion input end; the periphery of the plug body of the second piston is sealed and slidably matched with the inner cylinder wall of the second cylinder body.

[0011] In a preferred embodiment of the present invention, when the second cylinder is at the maximum extended position and the maximum retracted position on the first cylinder, both ends of the second cylinder are exposed outside the first cylinder.

[0012] In a preferred embodiment of the present invention, the conversion motion component includes a force-applying column and a forced sleeve, the force-applying column is arranged in the forced sleeve, one end of the force-applying column is connected to the driving end of the second lifting drive part, and one end of the forced sleeve is connected to the exchange arm; a spiral guide groove is provided on the circumferential surface of the main body of the force-applying column, and the spiral guide groove is arranged to surround upward; a positioning column is provided in the tube of the forced sleeve, and at least part of the positioning column is slid or rolled in the spiral guide groove.

[0013] In a preferred embodiment of the present invention, the lifting member includes a load-bearing bearing group, which is arranged between the lifting member and the forced sleeve to support the forced sleeve; the forced sleeve is rotatably arranged with the lifting member through the load-bearing bearing group.

[0014] The second aspect: A machining center includes a base, a processing table arranged on the base, and an exchange table detachably mounted on the processing table. The above-mentioned exchange workbench device is adopted, the water receiving tray is arranged at one end of the base, and the exchange arm is used to take and place the exchange table.

[0015] In a preferred embodiment of the present invention, it also includes a water receiving tray, which is arranged at one end of the base, and a mounting groove of the exchange drive assembly is provided at the bottom of the water receiving tray. A stop portion is provided on the outer peripheral surface of the exchange drive assembly, and the exchange drive assembly is at least partially provided in the mounting groove, and the stop portion is fixed to the notch of the mounting groove.

[0016] In a preferred embodiment of the present invention, a first oil delivery port and a second oil delivery port are provided at the bottom end of the first cylinder body, and the first oil delivery port and the second oil delivery port are respectively connected to the chambers on both sides of the first piston in the axial direction;

[0017] A third oil delivery port and a fourth oil delivery port are provided at the bottom end of the second cylinder body. The third oil delivery port and the fourth oil delivery port are respectively communicated with the chambers on both sides of the second piston in the axial direction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention relates to an exchange workbench device, which adopts a dual lifting drive structure for lifting drive and rotation drive respectively, wherein the lifting drive force applied by the first lifting drive part is directly received by the provided lifting member, and the provided conversion motion component is used to convert the lifting linear motion output by the second lifting drive part into rotational motion to drive the exchange arm to rotate, and the second lifting drive part is at least partially located in the driving end of the first lifting drive part, which can reduce the space required to be occupied by the exchange drive assembly in the horizontal and vertical directions, and is conducive to the exchange workbench device to perform the exchange operation of the workbench more smoothly and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention provides a schematic structural diagram of the exchange workbench device in a plane perspective;

[0021] Figure 2 A schematic structural diagram of the exchange workbench device provided by the present invention from another plane perspective;

[0022] Figure 3 To correspond Figure 2 Schematic diagram of the local cross-section structure;

[0023] Figure 4 The present invention corresponds to Figure 1 Schematic diagram of the local cross-section structure;

[0024] Figure 5 A schematic diagram of the principle structure of the first lifting drive unit and the second lifting drive unit provided by the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly structure between the processing table, the exchange workbench device and the water receiving tray provided by the present invention.

[0026] Description of reference numerals:

[0027] 100. Base; 200. Exchange arm; 300. Exchange drive assembly; 301. First lifting drive unit; 3011. First cylinder; 3011A. First oil delivery port; 3011B. Second oil delivery port; 3012. First piston; 3013. Second cylinder; 302. Second lifting drive unit; 3021. Second piston; 3022. Telescopic rod; 3023. Third oil delivery port; 3024. Fourth oil delivery port; 303. Stopper; 400. Conversion motion component; 401. Force-applying column; 402. Forced sleeve; 4011. Spiral guide groove; 4021. Positioning column; 500. Lifting member; 501. Load-bearing bearing group; 600. Water tray; 601. Mounting slot; 700. Base; 800. Processing table; 900. Exchange table. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two elements, indirect communication, or an interactive relationship between two elements.

[0033] like Figures 1 to 6 As shown, the present invention provides a rotating device for an exchange workbench device;

[0034] The first aspect: An exchange workbench device includes a base 100, an exchange arm 200 and an exchange drive assembly 300. The exchange drive assembly 300 is used to drive the exchange arm 200 to rise and fall and rotate. The exchange drive assembly 300 includes a first lifting drive part 301 and a second lifting drive part 302 provided at the driving end of the first lifting drive part 301. The second lifting drive part 302 is at least partially located in the first lifting drive part 301. During the lifting movement of the first lifting drive part 301, the second lifting drive part 302 can perform lifting movement relative to the first lifting drive part 301. The two do not interfere with each other and can perform lifting movement synchronously.

[0035] The base 100 is provided with a conversion motion component 400 for driving the exchange arm 200 to rotate and a lifting component 500 arranged between the base 100 and the conversion motion component 400 for driving the exchange arm 200 to rise and fall; the conversion motion component 400 includes a conversion input end and a conversion output end, the conversion input end is connected to the driving end of the second lifting drive part 302, and the conversion output end is connected to the exchange arm 200, and the conversion motion component 400 is used to convert the linear motion input by the second lifting drive part 302 into rotational motion, thereby driving the exchange arm 200 to rotate; due to the positional relationship between the first lifting drive part 301 and the second lifting drive part 302, the first lifting drive part 301 will drive the second lifting drive part 302 to rise and fall as a whole during the lifting process, thereby realizing the lifting function of the exchange arm 200.

[0036] In a preferred embodiment of the present invention, the first lifting drive unit 301 includes a first cylinder 3011, a first piston 3012, and a second cylinder 3013. The first cylinder 3011 is axially provided with a mounting hole that mates with the second cylinder 3013. The second cylinder 3013 extends through the mounting hole, and the first piston 3012 is located in the first cylinder 3011. The first piston 3012 is fixedly connected to the outer wall of the second cylinder 3013, and the periphery of the first piston 3012 is tightly and slidably engaged with the inner wall of the first cylinder 3011. Here, the first piston 3012 is an annular plug that is sleeved and fixedly mounted on the outer wall of the second cylinder 3013.

[0037] The outer wall of the second cylinder 3013 is sealed and slidably matched with the hole wall of the mounting hole. One end of the second cylinder 3013 extends out of the first cylinder 3011 and is connected to the lifting member 500.

[0038] Among them, the first cylinder body 3011 is a cylinder, and the first cylinder body 3011 is axially provided with a mounting hole. The size of the mounting hole can be adjusted according to the required diameter of the second cylinder body 3013. When the workpiece is large and the required supporting force is large, the diameter of the second cylinder body 3013 can be appropriately increased so that it can lift the workpiece during use; the first piston 3012 is annular and has the same radial cross-section as the first cylinder body 3011. The bottom of the first cylinder body 3011 is a split design, which is convenient for installing the first piston 3012; the second cylinder body 3013 is arranged in the mounting hole, and the height of the second cylinder body 3013 is equal to the height of the first cylinder body 3011 plus the height that the exchange arm 200 needs to rise. The inner ring of the first piston 3012 is fixed to the outer circumferential surface of the second cylinder body 3013, and the outer ring is sealed with the cylinder wall of the first cylinder body 3011. During the up and down movement of the first piston 3012 in the first cylinder body 3011, it will drive the second cylinder body 3013 to rise and fall.

[0039] In a preferred embodiment of the present invention, the second lifting drive unit 302 includes a second piston 3021 and a telescopic rod 3022, and the second piston 3021 is located in the second cylinder body 3013; one end of the telescopic rod 3022 is fixedly connected to the second piston 3021, and the other end passes through the second cylinder body 3013 and is fixedly connected to the conversion input end; the periphery of the plug body of the second piston 3021 is sealed and slidably matched with the inner cylinder wall of the second cylinder body 3013.

[0040] Among them, the second cylinder body 3013 is a cylindrical structure, and an axial second cylinder body 3013 is provided inside the second cylinder body 3013. The second cylinder body 3013 is cylindrical, and the top of the second cylinder body 3013 is a split structure, which is used to assemble the second piston 3021 and the telescopic rod 3022 in the second cylinder body 3013. The second piston 3021 is a flat cylindrical structure, and the diameter of the second piston 3021 is equal to the diameter of the second cylinder body 3013. The second piston 3021 can move up and down in the second cylinder body 3013, and the telescopic rod 3022 is provided on the top of the second piston 3021. The top of the second cylinder body 3013 is provided with an avoidance hole for the telescopic rod 3022. One end of the telescopic rod 3022 is fixedly connected to the top of the second piston 3021, and the other end extends from the avoidance hole. During the up and down movement of the second piston 3021, the telescopic rod 3022 moves up and down accordingly. During the up and down movement of the telescopic rod 3022, the conversion motion component 400 is driven to move, thereby driving the exchange arm 200 to rotate.

[0041] In a preferred embodiment of the present invention, the conversion motion component 400 includes a force-applying column and a forced sleeve that are nested with each other. The input end of the force-applying column is connected to the drive end of the second lifting drive unit, and the output end of the forced sleeve is connected to the exchange arm. Specifically, the force-applying column can be a force-applying column 401, and the forced sleeve can be a forced sleeve 402. The force-applying column 401 is disposed in the forced sleeve 402. The body of the force-applying column 401 is provided with a spiral guide groove 4011, which is arranged to extend upward. The forced sleeve 402 has a positioning column 4021 disposed within its barrel, and at least a portion of the positioning column 4021 slides or rolls within the spiral guide groove 4011. Here, the end of the force-applying column 401 connected to the second lifting unit 302 can serve as the aforementioned conversion input end, and the end of the forced sleeve 402 connected to the exchange arm 200 can serve as the aforementioned conversion output end.

[0042] Among them, a spiral guide groove 4011 is provided on the circumference of the main body of the force-applying column 401, and the number of the guide grooves is arranged corresponding to the positioning column 4021. At least part of the positioning column 4021 is slidably or rollingly arranged in the spiral guide groove 4011. One end of the positioning column 4021 located in the spiral guide groove 4011 is provided with a roller, and the other end is fixed to the inner circumference of the tube of the forced sleeve 402. The diameter of the roller is the same as the inner diameter of the spiral guide groove 4011, so that the roller is subjected to less friction when sliding or rolling in the spiral guide groove 4011. When the force-applying column 401 is lifted and lowered, the spiral guide groove 4011 on its surface also moves upward. Since the positioning column 4021 is initially stationary, during the upward movement of the spiral guide groove 4011, the positioning column 4021 is forced to move along the spiral guide groove 4011. Since the spiral guide groove 4011 is a spiral guide groove, the forced sleeve 402 fixedly connected to the positioning column 4021 rotates on the horizontal plane.

[0043] In some structural variations, the force-applying column may be a force-applying sleeve, and the forced sleeve may be a forced column. A spiral guide groove is provided on the forced column, and a positioning column is also provided within the force-applying sleeve. The force-applying sleeve is movable relative to the forced column, thereby causing the positioning column to move within the spiral guide groove, thereby forcing the entire forced column to rotate. Of course, there are other similar or similar structural variations, which will not be described in detail here due to structural empathy.

[0044] In a preferred embodiment of the present invention, the lifting member 500 includes a load-bearing assembly 501, which is disposed between the lifting member 500 and the forced sleeve 402 and is used to support the forced sleeve 402. The forced sleeve 402 is rotatably disposed with the lifting member 500 via the load-bearing assembly 501. Here, the lifting member 500 is a lifting sleeve, and each load-bearing bearing of the load-bearing assembly 501 is disposed within the lifting sleeve.

[0045] Among them, the base 100 of the lifting member 500 remains stationary during the lifting process, and the lifting base 700 drives the lifting member 500 to rise and fall. The conversion motion component 400 located inside the lifting member 500 also rises or falls accordingly. After the lifting member 500 has finished rising, it will not affect the function of the conversion motion component 400; the load-bearing bearing group 501 is composed of a number of load-bearing bearings whose axes are coaxial and parallel to each other. The load-bearing bearings include a fixed outer ring and a rotating inner ring. The fixed outer ring is fixed to the circumference of the inner cylinder of the lifting member 500, and the rotating inner ring is fixed to the outer circumference of the cylinder body of the forced sleeve 402; when there are two load-bearing bearings, they are distributed and fixed in the lifting member 500 up and down, supporting the forced sleeve 402. In addition, they also prevent the forced sleeve 402 from axial movement. The forced sleeve 402 can rotate under the support of the load-bearing bearing group 501.

[0046] The second aspect: A machining center includes a base 700, a processing table 800 arranged on the base 700, and an exchange table 900 detachably mounted on the processing table 800. The above-mentioned exchange workbench device is used, and the water receiving tray 600 is arranged at one end of the base 700. The exchange arm 200 is used to take and place the exchange table 900.

[0047] In a preferred embodiment of the present invention, a water collecting tray 600 is further included, and the water collecting tray 600 is arranged at one end of the base 700. A mounting groove 601 of the exchange drive assembly 300 is provided at the bottom of the water collecting tray 600, and a stop portion 303 is provided on the outer peripheral surface of the exchange drive assembly 300. The exchange drive assembly 300 is at least partially arranged in the mounting groove 601, and the stop portion 303 is fixed to the notch of the mounting groove 601.

[0048] Among them, the interior of the water collecting tray 600 is hollowed out, and the hollow bottom is provided with an installation groove 601 for installing the exchange drive assembly 300. A number of screw holes are evenly arranged on the periphery of the installation groove 601, and corresponding fixing holes are arranged on the stop portion 303 arranged on the outer peripheral surface of the exchange drive assembly 300, and the two are fixed by bolts.

[0049] In a preferred embodiment of the present invention, the bottom of the base 100 is fixed to the stopper 303 , and the bottom of the lifting member 500 located in the base 100 is connected to the driving end of the first lifting driving unit 301 .

[0050] The base 100 is a cylindrical structure, and its height is less than that of the lifting member 500. A plurality of screw holes are provided at the bottom of the base 100. The base 100 is sleeved on the outside of the lifting member 500 and is supported and fixed by the stopper 303. The lifting member 500 will not interfere with the base 100 during the lifting process.

[0051] In a preferred embodiment of the present invention, the bottom end of the first cylinder 3011 is provided with a first oil delivery port 3011A and a second oil delivery port 3011B. The first oil delivery port 3011A and the second oil delivery port 3011B are respectively connected to the chambers on either side of the first piston 3012 in the axial direction. The bottom end of the second cylinder 3013 is provided with a third oil delivery port 3023 and a fourth oil delivery port 3024. The third oil delivery port 3023 and the fourth oil delivery port 3024 are respectively connected to the chambers on either side of the second piston 3021 in the axial direction. Positioning the oil delivery ports of both the first and second cylinders 3011 and 3013 at the bottom reduces the installation space occupied above the stopper 303 and facilitates the layout of the oil delivery pipelines.

[0052] Working principle: After the workpiece is processed, it is unloaded and loaded, and the processing table 800 moves to the exchange arm 200. At this time, the first piston rod of the first lifting drive unit 301 drives the lifting member 500 to move up and down. At this time, the conversion motion component 400 located in the lifting member 500 is lifted and lowered at the same time, and the exchange arm 200 connected to the conversion motion component 400 is lifted. When the exchange arm 200 is lifted, the exchange arm 200 on one side of the exchange table 900 on the processing table 800 is lifted. Since the second lifting drive unit 302 is located at the first lifting drive unit 30 1, it is lifted by the first piston rod at the same time. When the exchange arm 200 is lifted to a predetermined height, the second piston rod of the second lifting drive unit 302 extends to convert the linear drive into a rotary motion through the conversion motion component 400, thereby driving the exchange arm 200 connected to the conversion motion component 400 to rotate and exchange the position, completing the exchange of the processed workpiece and the unprocessed material. Finally, the exchange arm 200 is lowered by the first lifting drive unit 301 until the exchange table 900 stably falls on the processing table 800.

[0053] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A switching workbench device, comprising a base (100), a switching arm (200) and a switching drive assembly (300), wherein the switching drive assembly (300) is used to drive the switching arm (200) to rise and fall and rotate, and is characterized in that: The base (100) is provided with a conversion motion component (400) for driving the exchange arm (200) to rotate, and a lifting component (500) provided between the base (100) and the conversion motion component (400) for driving the exchange arm (200) to rise and fall; the exchange drive assembly (300) comprises a first lifting drive unit (301) and a second lifting drive unit (302), wherein the driving end of the first lifting drive unit (301) is connected to the lifting component (500), the second lifting drive unit (302) is at least partially located in the driving end of the first lifting drive unit (301), and the driving end of the second lifting drive unit (302) is connected to the conversion motion component (400); The conversion motion component (400) includes a conversion input end and a conversion output end, the conversion input end is connected to the driving end of the second lifting drive unit (302), and the conversion output end is connected to the exchange arm (200), and the conversion motion component (400) is used to convert the linear motion input by the second lifting drive unit (302) into rotational motion; The conversion motion component (400) is located in the lifting component (500), the bottom of the lifting component (500) is fixedly arranged with the driving end of the first lifting drive part (301), and the lifting component (500) is used to drive the conversion motion component (400) to move up and down.

2. The exchange table device according to claim 1, characterized in that The first lifting drive unit (301) comprises a first cylinder (3011), a first piston (3012) and a second cylinder (3013); the first cylinder (3011) is axially provided with a mounting hole for matching with the second cylinder (3013); the second cylinder (3013) is arranged through the mounting hole; the first piston (3012) is located in the first cylinder (3011); the first piston (3012) is fixedly connected to the outer wall of the second cylinder (3013); the periphery of the plug body of the first piston (3012) is sealed and slidably matched with the inner cylinder wall of the first cylinder (3011); The outer wall of the second cylinder body (3013) is sealed and slidably matched with the hole wall of the mounting hole, and one end of the second cylinder body (3013) extends out of the first cylinder body (3011) and is connected to the lifting member (500).

3. The exchange table device according to claim 2, characterized in that The second lifting drive unit (302) includes a second piston (3021) and a telescopic rod (3022), wherein the second piston (3021) is located in the second cylinder (3013); one end of the telescopic rod (3022) is fixedly connected to the second piston (3021), and the other end passes through the second cylinder (3013) and is fixedly connected to the conversion input end; the periphery of the plug body of the second piston (3021) is sealed and slidably matched with the inner cylinder wall of the second cylinder (3013).

4. The exchange table device according to claim 2, characterized in that: When the second cylinder (3013) is at the maximum extended position and the maximum retracted position on the first cylinder (3011), both ends of the second cylinder (3013) are exposed outside the first cylinder (3011).

5. The exchange workbench device according to any one of claims 1 to 4, characterized in that: The conversion motion component (400) includes a force-applying column (401) and a forced sleeve (402), wherein the force-applying column (401) is arranged in the forced sleeve (402), one end of the force-applying column (401) is connected to the driving end of the second lifting drive part (302), and one end of the forced sleeve (402) is connected to the exchange arm (200); a spiral guide groove (4011) is provided on the circumferential surface of the body of the force-applying column (401), and the spiral guide groove (4011) is arranged to surround upward; a positioning column (4021) is provided in the cylinder of the forced sleeve (402), and at least a part of the positioning column (4021) is slidably or rollingly arranged in the spiral guide groove (4011).

6. The exchange table device according to claim 5, characterized in that: The lifting member (500) includes a load-bearing bearing group (501), which is arranged between the lifting member (500) and the forced sleeve (402) and is used to support the forced sleeve (402); the forced sleeve (402) is rotatably arranged through the load-bearing bearing group (501) and the lifting member (500).

7. A machining center, comprising a base (700), a machining table (800) disposed on the base (700), and an exchange table (900) detachably mounted on the machining table (800), characterized in that: The exchange workbench device according to any one of claims 1 to 6 is adopted, wherein the exchange arm (200) is used to take and place the exchange table (900).

8. The machining center according to claim 7, characterized in that: The invention also includes a water receiving tray (600), the water receiving tray (600) being arranged at one end of the base (700), the bottom of the water receiving tray (600) being provided with a mounting groove (601) for the exchange drive assembly (300), the outer peripheral surface of the exchange drive assembly (300) being provided with a stopper (303), the exchange drive assembly (300) being at least partially arranged in the mounting groove (601), and the stopper (303) being fixedly arranged with the notch of the mounting groove (601).

9. The machining center according to claim 8, characterized in that The first lifting drive unit (301) comprises a first cylinder (3011), a first piston (3012) and a second cylinder (3013); a first oil delivery port (3011A) and a second oil delivery port (3011B) are provided at the bottom end of the first cylinder (3011); the first oil delivery port (3011A) and the second oil delivery port (3011B) are respectively connected to chambers on both sides of the first piston (3012) in the axial direction; The second lifting drive unit (302) includes a second piston (3021), and the bottom end of the second cylinder body (3013) is provided with a third oil delivery port (3023) and a fourth oil delivery port (3024), and the third oil delivery port (3023) and the fourth oil delivery port (3024) are respectively connected to the chambers on both sides of the second piston (3021) in the axial direction.

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