A double-layer external replacement cutter device

Abstract

The present invention provides a double-layer external tool changing device, which relates to the technical field of numerical control tool changing and includes: a tool magazine rack, inside which two lifting tool seats are installed. The two lifting tool seats are arranged longitudinally and are connected by two plate connecting cylinders. Two guiding rotating cylinders are rotatably connected to the lifting tool seats through bearings. A tool changing sprocket is fixedly connected to the outside of the guiding rotating cylinder. The two tool changing sprockets in the same lifting tool seat are connected by a pulling chain to form a chain drive. In the external tool changing device of the present invention, a double-layer tool holder is built in the tool magazine. The tool holder is a chain-type tool holder composed of a lifting tool seat, a guiding rotating cylinder, a pulling chain and a movable tool clamp. Machine tools are placed on the machine tool through the movable tool clamp, and a manipulator is used to change tools for the numerical control machine tool. The double-layer pulling chain can effectively increase the total capacity of the tools in the tool magazine, effectively improve the storage density of the tools, reduce the space occupation, and is conducive to the installation and layout of the machine tool.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control tool changing, and particularly to a double-layer external tool changing device. Background Art

[0002] A chain-type tool magazine is an automatic tool changing device in a numerical control machine tool. It connects each tool position through a chain, drives the chain transmission by a motor to achieve the transmission of tools, and cooperates with an external manipulator to install the tools into the numerical control machine tool to achieve automatic tool changing. The chain-type tool magazine has a large tool capacity and flexible layout, can store a variety of tools to meet the needs of complex machining processes, and is widely used in industries such as automotive parts, aerospace parts machining and mold manufacturing, etc. Its efficient and stable tool changing performance improves machining efficiency and accuracy.

[0003] In a traditional chain-type tool magazine, for a numerical control machine tool that needs to frequently change tools and requires a large number of tools, in order to increase the capacity of the chain-type tool magazine and the tool changing efficiency, it is necessary to increase the full-circumference bypass length of the chain. Therefore, it is necessary to expand the occupied space of the tool magazine, which will cause the tool magazine to be too large in volume, and the increase in the tool conveying distance during the tool changing process will lead to an increase in energy consumption and a decrease in tool changing efficiency. Summary of the Invention

[0004] Embodiments of the present disclosure relate to a double-layer external tool changing device to solve the problem that in a traditional chain-type tool magazine, for a numerical control machine tool that needs to frequently change tools and requires a large number of tools, in order to increase the capacity of the chain-type tool magazine and the tool changing efficiency, it is necessary to increase the full-circumference bypass length of the chain. Therefore, it is necessary to expand the occupied space of the tool magazine, which will cause the tool magazine to be too large in volume, and the increase in the tool conveying distance during the tool changing process will lead to an increase in energy consumption and a decrease in tool changing efficiency.

[0005] In the first aspect of the present disclosure, a double-layer external tool replacement device is provided, specifically including: a tool magazine rack, inside which two lifting tool seats are installed. The two lifting tool seats are longitudinally arranged and distributed. The two lifting tool seats are connected by two plate connecting cylinders. Two guiding rotating cylinders are rotatably connected to the lifting tool seats through bearings. A tool replacement sprocket is fixedly connected to the outside of the guiding rotating cylinder. The two tool replacement sprockets in the same lifting tool seat are connected by a traction chain to form a chain drive. An active tool holder is installed on the traction chain. The upper edge and the lower edge of the front of the tool magazine rack are respectively fixedly connected with an upper shelf plate and a lower shelf plate. An operating drive member is installed above the upper shelf plate through bolts. An active displacement guiding column and a driven displacement guiding column are installed between the upper shelf plate and the lower shelf plate. The driven displacement guiding column is located on the left front side of the tool magazine rack, and the active displacement guiding column is located on the right front side of the tool magazine rack. An upgraded displacement drive member is installed above the upper shelf plate through bolts. The rotating shaft of the upgraded displacement drive member is fixedly connected with a displacement lead screw. The displacement lead screw is rotatably connected to the upper shelf plate and the lower shelf plate through bearings. A lifting screw hole is longitudinally penetrated in the lifting tool seat, and the lifting screw hole is helically connected to the displacement lead screw. The active displacement guiding column includes an active upper connecting column, a rotating connecting column, and an active lower connecting column. An upper connecting column core cavity is opened inside the active upper connecting column. The upper end of the rotating connecting column is fixedly connected with a connecting column rotating rod. The upper end of the connecting column rotating rod is fixedly connected with the rotating shaft of the operating drive member. The connecting column rotating rod is rotatably connected to the upper connecting column core cavity through a bearing. A middle section support shaft is opened in the middle of the driven displacement guiding column, and a driven rotating sleeve is rotatably connected to the middle section support shaft.

[0006] In at least some embodiments, two parallel guide rods are fixedly connected between the upper shelf plate and the lower shelf plate. Two parallel guide holes are longitudinally penetrated in the lifting tool seat, and the parallel guide holes are slidably connected to the parallel guide rods.

[0007] In at least some embodiments, a balance support plate is fixedly connected to the lower part of the lifting tool seat, and two parallel guide holes are longitudinally penetrated in the lifting tool seat.

[0008] In at least some embodiments, an internal transmission groove is longitudinally penetrated inside the guiding rotating cylinder, and longitudinally distributed tooth grooves are opened on the inner wall of the internal transmission groove.

[0009] In at least some embodiments, a tool holder support plate is fixedly connected to the lower part of the active tool holder. A balance support wheel is rotatably connected to the tool holder support plate, and the balance support wheel is in rolling connection with the outer edge of the balance support plate.

[0010] In at least some embodiments, a connecting column connection cavity is opened at the center of the lower end of the rotating connecting column. The upper end of the active lower connecting column is fixedly connected with a lower connecting column insertion rod, and the lower connecting column insertion rod is rotatably connected inside the connecting column connection cavity through a bearing.

[0011] In at least some embodiments, the upper end of the active upper connecting column is fixedly connected to the lower surface of the upper mounting plate, and the lower end of the active lower connecting column is fixedly connected to the upper surface of the lower mounting plate.

[0012] In at least some embodiments, both ends of the connecting cylinder of the mounting plate are located at the ends of the parallel guide holes of the upper and lower lifting tool seats, and the parallel guide rods are slidably connected to both the parallel guide holes and the connecting cylinder of the mounting plate.

[0013] The present invention provides a double-layer external tool changing device, which has the following beneficial effects:

[0014] In the external tool changing device of the present invention, the tool magazine is internally provided with a double-layer tool rack. The tool rack is a chain-type tool rack composed of a lifting tool seat, a guiding rotating cylinder, a pulling chain and a movable tool holder. Machine tools are placed through the movable tool holder, and the positions of different movable tool holders are switched by the rotation of the pulling chain, so that the required tool is conveyed near the manipulator. The manipulator is used to change the tool of the numerical control machine tool. The double-layer pulling chain can effectively increase the total capacity of the tools in the tool magazine, effectively improve the storage density of the tools, reduce the space occupation, and is conducive to the installation and layout of the machine tool.

[0015] In addition, by upgrading the cooperation between the position-changing driving part and the position-changing lead screw, the upgraded position-changing driving part drives the position-changing lead screw to rotate. The position-changing lead screw and the lifting screw hole form a screw drive, thereby pushing the two groups of chain-type tool racks to move up and down synchronously. By adjusting the heights of the two chain-type tool racks, the two chain-type tool racks are switched to the position of the manipulator material taking area for tool changing, further improving the operation flexibility of the tool magazine. Compared with the single-layer, long-chain multi-load single-layer chain-type tool magazine, the double-layer chain-type tool magazine has a shorter chain, and the single-cycle operation tool change is faster. And with the position switching of the double-layer chain-type tool rack, it is possible to ensure that the running distance of the chain during the tool change process is reduced under the condition of unchanged load capacity, improve the tool change efficiency, and reduce the failure rate.

[0016] In addition, the double-layer chain-type tool rack is driven by the same driving mechanism. By upgrading the cooperation between the position-changing driving part and the position-changing lead screw, the heights of the double-layer chain-type tool racks are adjusted to realize the position switching of the two chain-type tool racks and the connection with the driving mechanism, and the same operation driving part and the rotating connecting column are used to drive the guiding rotating cylinder to rotate, realizing the rotational drive of the pulling chain, saving the manufacturing cost of the chain-type tool magazine, simplifying the transmission mode, and reducing the failure rate of the tool changing device. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0018] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the accompanying drawings:

[0020] Figure 1 A schematic diagram showing the overall structure of the present application;

[0021] Figure 2 A schematic top view structure diagram of the present application;

[0022] Figure 3 A schematic right view structure diagram of the present application;

[0023] Figure 4 A schematic diagram showing the structure of the bottom of the present application;

[0024] Figure 5 A schematic diagram showing the structure of the present application in a separated state of two sets of lifting tool holders;

[0025] Figure 6 A schematic diagram showing the structure of the present application in an unloaded state of the lifting tool holder;

[0026] Figure 7 Shows the present application Figure 5 A schematic diagram of the structure below;

[0027] Figure 8 A schematic diagram showing the structure of the tool magazine rack of the present application;

[0028] Figure 9 A schematic diagram showing the structure of the active position-changing guide column and the driven position-changing guide column of the present application in a disassembled state;

[0029] Figure 10 A schematic diagram showing the structure of the active position-changing guide column of the present application in a disassembled state;

[0030] Figure 11 A schematic diagram showing the structure of the driven position-changing guide column of the present application in a disassembled state;

[0031] Figure 12 Shows the present application Figure 7 A schematic diagram of the enlarged local structure at position A in the present application.

[0032] List of reference numerals: 1, tool magazine rack; 101, upper mounting plate; 102, lower mounting plate; 103, parallel guide rod; 2, lifting tool holder; 201, balancing support plate; 202, lifting screw hole; 203, parallel guide hole; 204, mounting plate connecting cylinder; 3, guiding rotary cylinder; 301, inner transmission groove; 302, tool changing sprocket; 4, pulling chain; 5, movable tool clamp; 501, tool clamp support plate; 502, balancing support wheel; 6, operating drive member; 7, active position-changing guide post; 701, active upper connecting post; 7011, core cavity of upper connecting post; 702, rotary connecting post; 7021, connecting post rotary rod; 7022, connecting post connecting cavity; 703, active lower connecting post; 7031, lower connecting post inserting rod; 8, driven position-changing guide post; 801, middle-section support shaft; 802, driven rotary sleeve; 9, upgraded position-changing drive member; 10, position-changing lead screw. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] Embodiment 1: Please refer to Figures 1 to 12 :

[0035] The present invention provides a double-layer external tool changing device, comprising: a tool magazine rack 1, inside which two lifting tool seats 2 are installed. The two lifting tool seats 2 are longitudinally arranged and distributed, and the two lifting tool seats 2 are connected by two plate connecting cylinders 204. Two guiding rotating cylinders 3 are rotatably connected to the lifting tool seats 2 through bearings. An indexing sprocket 302 is fixedly connected to the outside of the guiding rotating cylinder 3. The two indexing sprockets 302 in the same lifting tool seat 2 are connected by a chain 4 to form a chain drive. A movable tool holder 5 is installed on the chain 4. The upper front edge and the lower front edge of the tool magazine rack 1 are respectively fixedly connected with an upper shelf plate 101 and a lower shelf plate 102. An operating drive member 6 is installed above the upper shelf plate 101 by bolts. An active position-changing guiding column 7 and a driven position-changing guiding column 8 are installed between the upper shelf plate 101 and the lower shelf plate 102. The driven position-changing guiding column 8 is located on the left front side of the tool magazine rack 1, and the active position-changing guiding column 7 is located on the right front side of the tool magazine rack 1. An upgraded position-changing drive member 9 is installed above the upper shelf plate 101 by bolts. A position-changing lead screw 10 is fixedly connected to the rotating shaft of the upgraded position-changing drive member 9. The position-changing lead screw 10 is rotatably connected to the upper shelf plate 101 and the lower shelf plate 102 through bearings. A lifting screw hole 202 is longitudinally formed through the lifting tool seat 2, and the lifting screw hole 202 is in threaded connection with the position-changing lead screw 10. The active position-changing guiding column 7 includes an active upper connecting column 701, a rotating connecting column 702, and an active lower connecting column 703. An upper connecting column core cavity 7011 is formed inside the active upper connecting column 701. A connecting column rotating rod 7021 is fixedly connected to the upper end of the rotating connecting column 702. The upper end of the connecting column rotating rod 7021 is fixedly connected to the rotating shaft of the operating drive member 6. The connecting column rotating rod 7021 is rotatably connected to the upper connecting column core cavity 7011 through a bearing. A middle section support shaft 801 is formed in the middle of the driven position-changing guiding column 8, and a driven rotating sleeve 802 is rotatably connected to the middle section support shaft 801; so that the active upper connecting column 701 and the active lower connecting column 703 are always in a fixed state, the rotating connecting column 702 is in a circumferentially movable state, and a stable radial position is maintained, and the rotating shaft of the operating drive member 6 drives the rotating connecting column 702, and the circumferential uniform rotation of the rotating connecting column 702 can be controlled. In the state where the driven rotating sleeve 802 is in cooperation with the guiding rotating cylinder 3, it acts as a driven wheel, positions the longitudinal height of the chain 4, and ensures the running stability of the chain 4.

[0036] In the embodiment of the present disclosure, two parallel guide rods 103 are fixedly connected between the upper shelf plate 101 and the lower shelf plate 102. Two parallel guide holes 203 are longitudinally formed through the lifting tool seat 2. The parallel guide holes 203 are slidably connected to the parallel guide rods 103. The two ends of the plate connecting cylinder 204 are located at the ends of the parallel guide holes 203 of the upper and lower lifting tool seats 2. Both the parallel guide holes 203 and the plate connecting cylinder 204 are slidably connected to the parallel guide rods 103, playing a guiding role, making the two lifting tool seats 2 parallel to the bottom surface of the tool magazine rack 1, keeping the distance between the two lifting tool seats 2 fixed, and keeping the two lifting tool seats 2 lifting synchronously.

[0037] In the embodiment of the present disclosure, a balance support plate 201 is fixedly connected below the lifting tool rest 2, and a tool holder support plate 501 is fixedly connected below the movable tool holder 5. A balance support wheel 502 is rotatably connected to the tool holder support plate 501, and the balance support wheel 502 is in rolling connection with the outer edge of the balance support plate 201; in the normal state, the movable tool holder 5 is fixedly connected to the pulling chain 4, and the balance support wheel 502 below the movable tool holder 5 is in rolling connection with the outer edge of the balance support plate 201, playing a role in supporting the balance support wheel 502, avoiding the phenomenon that the movable tool holder 5 tilts due to the increase in load, and reducing the torsional pressure on the pulling chain 4, avoiding the phenomenon that the pulling chain 4 is distorted due to excessive eccentric pressure and causing chain jamming and chain derailment, effectively improving the operation stability of the tool changing device and reducing the failure rate of the tool changing device.

[0038] Embodiment 2, on the basis of Embodiment 1, an internal transmission groove 301 is longitudinally penetrated inside the guiding rotating cylinder 3, and longitudinally distributed tooth grooves are provided on the inner wall of the internal transmission groove 301; a connecting column receiving cavity 7022 is provided at the center of the lower end of the rotating connecting column 702, and a lower connecting column inserting rod 7031 is fixedly connected to the upper end of the active lower connecting column 703. The lower connecting column inserting rod 7031 is rotatably connected inside the connecting column receiving cavity 7022 through a bearing; the upper end of the active upper connecting column 701 is fixedly connected to the lower surface of the upper support plate 101, and the lower end of the active lower connecting column 703 is fixedly connected to the upper surface of the lower support plate 102; in the normal state, the internal transmission groove 301 is slidably connected to the external teeth of the active position-changing guiding column 7 or the driven position-changing guiding column 8. When the guiding rotating cylinder 3 at the left end of a group of lifting tool rests 2 is located on the driven position-changing guiding column 8 and the guiding rotating cylinder 3 at the right end is located on the active upper connecting column 701 or the active lower connecting column 703, the tooth grooves inside the internal transmission groove 301 are engaged with the tooth-shaped structure on the outer surface of the column body, and the guiding rotating cylinder 3 will be circumferentially locked, making the guiding rotating cylinder 3 unable to rotate, locking the pulling chain 4, and avoiding the change of the position of the movable tool holder 5 in the pulling chain 4; and when the positions of the two lifting tool rests 2 are adjusted so that the pulling chain 4 where the required tool is located is in the middle position, the guiding rotating cylinder 3 at the left end of the lifting tool rest 2 is sleeved on the driven rotating sleeve 802, and the guiding rotating cylinder 3 at the right end is sleeved on the rotating connecting column 702. When the rotating connecting column 702 is driven to rotate by the driving member 6, the rotating connecting column 702 drives the guiding rotating cylinder 3 to rotate, the tool changing sprocket 302 rotates, driving the pulling chain 4 to rotate on the two end tool changing sprockets 302, and the driven rotating sleeve 802 rotates. The movable tool holder 5 installed above it is driven to move by the rotation of the pulling chain 4, and the movable tool holder 5 storing the required tool is transferred to a position near the manipulator. The manipulator picks and places the tool in the movable tool holder 5. In this state, the guiding rotating cylinder 3 at the left end of the other group of lifting tool rests 2 is located on the driven position-changing guiding column 8, and the guiding rotating cylinder 3 at the right end is located on the active upper connecting column 701 or the active lower connecting column 703. The guiding rotating cylinder 3 is circumferentially locked through the tooth-shaped structure, making the guiding rotating cylinder 3 unable to rotate, and avoiding the displacement of the pulling chain 4 and changing the tool position.

[0039] Working principle of this embodiment: First, the double-layer external tool changing device is installed outside the numerical control machine tool, and a manipulator for cooperating with the tool changing of the machine tool is installed at the right end of the external tool changing device; in the state where no tool change is required, the left end guiding rotary cylinder 3 of the upper tool lifting seat 2 is sleeved on the driven position-changing guiding column 8, and the right end guiding rotary cylinder 3 is sleeved on the active upper connecting column 701. The left end guiding rotary cylinder 3 of the lower tool lifting seat 2 is sleeved on the driven position-changing guiding column 8, and the right end guiding rotary cylinder 3 is sleeved on the active lower connecting column 703. In this state, the driven position-changing guiding column 8, the active upper connecting column 701, and the active lower connecting column 703 are all in a fixed state, which can prevent the guiding rotary cylinder 3 from rotating, prevent the traction chain 4 from deflecting slightly under the action of external force, and prevent the movable tool holder 5 from displacing and deviating from the original set position; when the machine tool needs to change tools, control the upgrade position-changing driving member 9 to act. The upgrade position-changing driving member 9 drives the position-changing lead screw 10 to rotate. During the rotation of the position-changing lead screw 10, a screw drive is formed with the two lifting screw holes 202, and at the same time, the two tool lifting seats 2 are driven to rise or fall, so that the tool lifting seat 2 at the position where the required tool is located moves to the middle position of the tool magazine rack 1, and the left end guiding rotary cylinder 3 of the tool lifting seat 2 is sleeved on the driven rotary sleeve 802, and the guiding rotary cylinder 3 at the right end is sleeved on the rotating connecting column 702. When the rotating connecting column 702 is driven to rotate by the operating driving member 6, the rotating connecting column 702 drives the guiding rotary cylinder 3 to rotate, the tool changing sprocket 302 rotates, drives the traction chain 4 to rotate on the two end tool changing sprockets 302, and the driven rotary sleeve 802 rotates. The movable tool holder 5 installed above it is driven to move by the rotation of the traction chain 4, and the movable tool holder 5 storing the required tool is transferred to a position near the manipulator. The manipulator picks and places the tool in the movable tool holder 5. At the same time, the guiding rotary cylinder 3 at the left end of the other tool lifting seat 2 is located on the driven position-changing guiding column 8, and the guiding rotary cylinder 3 at the right end is located on the active upper connecting column 701 or the active lower connecting column 703. The circumferential locking of the guiding rotary cylinder 3 is carried out through the tooth-shaped structure, so that the guiding rotary cylinder 3 cannot rotate, and the tool in the tool lifting seat 2 is locked; when the tool change is completed, control the upgrade position-changing driving member 9 to act again. During the rotation of the position-changing lead screw 10, a screw drive is formed with the two lifting screw holes 202, and at the same time, the two tool lifting seats 2 are driven to rise or fall, so that the two tool lifting seats 2 are respectively located in the upper area and the lower area of the rotating connecting column 702, and the double-layer tool rack is locked synchronously again.

[0040] In this article, the following points need to be noted:

[0041] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0042] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A double-layer external blade replacement device, comprising: The tool magazine frame (1) is characterized in that two lifting tool seats (2) are installed inside the tool magazine frame (1), the two lifting tool seats (2) are arranged longitudinally, the two lifting tool seats (2) are connected by two frame plate connecting tubes (204), the lifting tool seats (2) are rotatably connected to two guide rotary cylinders (3) through bearings, the guide rotary cylinder (3) is fixedly connected to a tool changing sprocket (302) outside, the two tool changing sprockets (302) in the same lifting tool seat (2) are connected by a pulling chain (4) to form a chain drive, the pulling chain (4) is equipped with a movable tool clamp (5), the front upper side of the tool magazine frame (1) The upper and lower edges of the tool magazine frame (1) are respectively fixedly connected to an upper frame plate (101) and a lower frame plate (102); a running drive member (6) is installed on the upper frame plate (101) by bolts; an active transposition guide column (7) and a passive transposition guide column (8) are installed between the upper frame plate (101) and the lower frame plate (102); the passive transposition guide column (8) is located on the front left side of the tool magazine frame (1); the active transposition guide column (7) is located on the front right side of the tool magazine frame (1); an upgraded transposition drive member (9) is installed on the upper frame plate (101) by bolts; the rotating shaft of the upgraded transposition drive member (9) is fixedly connected to the transposition drive member (6); The transposition screw (10) is rotatably connected to the upper frame plate (101) and the lower frame plate (102) via a bearing. The lifting knife seat (2) is longitudinally penetrated with a lifting screw hole (202). The lifting screw hole (202) is spirally connected to the transposition screw (10). The active transposition guide column (7) includes an active upper connecting column (701), a rotating connecting column (702) and an active lower connecting column (703). An upper connecting column core cavity (7011) is provided inside the active upper connecting column (701). The upper end of the rotating connecting column (702) is fixedly connected to a connecting column rotary rod (7021). The connecting column rotary rod (7021) is The upper end is fixedly connected to the rotating shaft of the operating driving member (6); the connecting column rotating rod (7021) is rotatably connected to the upper connecting column core cavity (7011) through a bearing; a middle section support shaft (801) is provided in the middle of the driven transposition guide column (8); a driven rotating sleeve (802) is rotatably connected to the middle section support shaft (801); a balancing support plate (201) is fixedly connected to the lower side of the lifting knife seat (2); two parallel guide holes (203) are longitudinally penetrated on the lifting knife seat (2); an inner transmission groove (301) is longitudinally penetrated inside the guide rotary cylinder (3); and longitudinally distributed tooth grooves are provided on the inner wall of the inner transmission groove (301).

2. A double-layer external blade replacement device according to claim 1, characterized in that: Two parallel guide rods (103) are fixedly connected between the upper frame plate (101) and the lower frame plate (102), and two parallel guide holes (203) are longitudinally penetrated on the lifting knife seat (2), and the parallel guide holes (203) are slidably connected to the parallel guide rods (103).

3. A double-layer external blade replacement device according to claim 1, characterized in that: A tool clamp support plate (501) is fixedly connected to the bottom of the movable tool clamp (5), a balancing support wheel (502) is rotatably connected to the tool clamp support plate (501), and the balancing support wheel (502) is rollingly connected to the outer edge of the balancing support plate (201).

4. A double-layer external blade replacement device according to claim 1, characterized in that: A connecting column connection cavity (7022) is provided at the center of the lower end of the rotating connecting column (702), a lower connecting column insertion rod (7031) is fixedly connected to the upper end of the active lower connecting column (703), and the lower connecting column insertion rod (7031) is rotatably connected to the interior of the connecting column connection cavity (7022) via a bearing.

5. A double-layer external blade replacement device according to claim 4, characterized in that: The upper end of the active upper connecting column (701) is fixedly connected to the lower surface of the upper frame plate (101), and the lower end of the active lower connecting column (703) is fixedly connected to the upper surface of the lower frame plate (102).

6. A double-layer external blade replacement device according to claim 2, characterized in that: The two ends of the frame plate connecting tube (204) are located at the ends of the parallel guide holes (203) of the upper and lower lifting knife seats (2), and the parallel guide holes (203) and the frame plate connecting tube (204) are both slidably connected to the parallel guide rods (103).

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