A double-layer external blade replacement 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 comprises: a tool magazine frame, wherein two lifting tool seats are installed inside the tool magazine frame, and the two lifting tool seats are arranged longitudinally, and the two lifting tool seats are connected by two frame plate connecting tubes, and two guide rotary cylinders are rotatably connected to the lifting tool seat through bearings, and a tool changing sprocket is fixedly connected to the outside of the guide rotary cylinder, and two tool changing sprockets in the same lifting tool seat are connected by a traction chain to form a chain transmission. The tool magazine in the external tool changing device of the present invention is equipped with a double-layer tool holder, which is a chain tool holder composed of a lifting tool seat, a guide rotary cylinder, a traction chain and a movable tool clamp. The tool for a machine tool is placed by the movable tool clamp, and the tool for the numerical control machine tool is changed by a manipulator. The double-layer traction chain can effectively increase the total capacity of the tools in the tool magazine, and effectively increase the storage density of the tools, reduce the space occupied, and facilitate the installation and layout of the machine tool.

Description

Technical Field

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

[0002] The chain tool magazine is an automatic tool changing device in CNC machine tools. It connects each tool position through a chain, and the motor drives the chain transmission to realize the transmission of the tool. It cooperates with the external manipulator to install the tool into the CNC machine tool to realize automatic tool change. The chain tool magazine has a large tool capacity and flexible layout. It can store a variety of tools to meet the needs of complex processing technology. It is widely used in industries such as automotive parts, aerospace parts processing and mold manufacturing. Its efficient and stable tool changing performance improves processing efficiency and precision.

[0003] In traditional chain tool magazines, for CNC machine tools that need to change tools frequently and require a large number of tools, in order to increase the capacity of the chain tool magazine and the tool changing efficiency, it is necessary to increase the full circle length of the chain. Therefore, it is necessary to expand the space occupied by the tool magazine, which will cause the tool magazine to be too large. In addition, the tool transportation distance during the tool changing process increases, resulting in increased energy consumption and reduced tool changing efficiency. Summary of the invention

[0004] The disclosed embodiment relates to a double-layer external tool changing device to solve the problem that in a traditional chain tool magazine, for CNC machine tools that need to frequently change tools and require a large number of tools, in order to improve the capacity of the chain tool magazine and the tool changing efficiency, it is necessary to increase the full-circle bypass length of the chain, thereby expanding the occupied space of the tool magazine, which will cause the tool magazine to be too large, and the tool transportation distance during the tool changing process increases, resulting in increased energy consumption and reduced tool changing efficiency.

[0005] The first aspect of the present disclosure provides a double-layer external tool changing device, which specifically includes: a tool magazine frame, two lifting tool seats are installed inside the tool magazine frame, the two lifting tool seats are arranged longitudinally, and the two lifting tool seats are connected by two frame plate connecting tubes, and two guide rotary cylinders are rotatably connected to the lifting tool seat through bearings, and a tool changing sprocket is fixedly connected to the outside of the guide rotary cylinder, and the two tool changing sprockets in the same lifting tool seat are connected by a traction chain to form a chain transmission, and a movable tool clamp is installed on the traction chain, and the front upper and lower edges of the tool magazine frame are fixedly connected to the upper frame plate and the lower frame plate respectively, and a running drive member is installed above the upper frame plate by bolts, and an active transposition guide column and a driven transposition guide column are installed between the upper frame plate and the lower frame plate, and the driven transposition guide column is located at the tool magazine The cam is provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, and the camshafts are provided with a plurality of camshafts, each of which is provided with a plurality of camshafts, and the plurality of camshafts are provided with a plurality of camshafts, each of which is provided with a plurality of camshafts.

[0006] In at least some embodiments, two parallel guide rods are fixedly connected between the upper frame plate and the lower frame plate, and two parallel guide holes are longitudinally opened on the lifting knife seat, and the parallel guide holes are slidably connected to the parallel guide rods.

[0007] In at least some embodiments, a balancing support plate is fixedly connected to the lower side of the lifting knife seat, and two parallel guide holes are longitudinally penetrated through the lifting knife seat.

[0008] In at least some embodiments, an inner transmission groove is longitudinally penetrated inside the guide rotor, and longitudinally distributed tooth grooves are formed on the inner wall of the inner transmission groove.

[0009] In at least some embodiments, a tool holder support plate is fixedly connected below the movable tool holder, a balancing support wheel is rotatably connected to the tool holder support plate, and the balancing support wheel is rollingly connected to the outer edge of the balancing support plate.

[0010] In at least some embodiments, a connecting column cavity is provided at the center of the lower end of the rotating connecting column, a lower connecting column plug rod is fixedly connected to the upper end of the active lower connecting column, and the lower connecting column plug rod is rotatably connected to the inside of the connecting column cavity via 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 frame plate, and the lower end of the active lower connecting column is fixedly connected to the upper surface of the lower frame plate.

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

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

[0014] The tool magazine in the external tool changing device of the present invention is equipped with a double-layer tool holder, which is a chain-type tool holder composed of a lifting tool seat, a guide rotary cylinder, a pulling chain and a movable tool clamp. The tool for the machine tool is placed on the movable tool clamp, and the position of different movable tool clamps is switched by rotating the pulling chain, so that the required tool is transported to the vicinity of the manipulator, and the tool of the CNC machine tool is changed by the manipulator. The double-layer pulling chain can effectively increase the total capacity of the tools in the tool magazine, and effectively increase the storage density of the tools, reduce the space occupied, and facilitate the installation and layout of the machine tool.

[0015] In addition, by upgrading the coordination between the transposition drive and the transposition screw, the upgraded transposition drive drives the transposition screw to rotate, and the transposition screw and the lifting screw hole form a spiral transmission, thereby promoting the synchronous lifting and lowering movement of the two sets of chain tool holders. By adjusting the heights of the two chain tool holders, the two chain tool holders are switched to the position of the robotic arm's material picking area for tool change, thereby further improving the operational flexibility of the tool magazine. Compared with a single-layer chain tool magazine with a single layer and a long chain and multiple loads, the double-layer chain tool magazine has a shorter chain and faster tool change in a single cycle. In combination with the position switching of the double-layer chain tool holder, it can ensure that the chain's operating distance during tool change is reduced while the load remains unchanged, thereby improving tool change efficiency and reducing the failure rate.

[0016] In addition, the double-layer chain tool holder is driven by the same driving mechanism. The height of the double-layer chain tool holder is adjusted by upgrading the shifting driving member and the shifting screw to realize the switching of the positions of the two chain tool holders and the connection with the driving mechanism. The guide rotary drum is driven to rotate by the same operating driving member and the rotating connecting column to realize the rotation drive of the pulling chain, which saves the manufacturing cost of the chain tool magazine, simplifies the transmission method, and reduces the failure rate of the tool changing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture:

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

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

[0022] Figure 3 A right view structural diagram of the present application is shown;

[0023] Figure 4 The structural schematic diagram at the bottom of this application is shown;

[0024] Figure 5 It shows a schematic diagram of the structure of the two sets of lifting knife seats in the present application in a separated state;

[0025] Figure 6 It shows a schematic diagram of the structure of the lifting knife seat of the present application in an unloaded state;

[0026] Figure 7 Shows this application Figure 5 The structural diagram below:

[0027] Figure 8 The schematic diagram of the structure of the tool magazine rack of the present application is shown;

[0028] Fig. 9 It shows a schematic structural diagram of the active transposition guide column and the driven transposition guide column of the present application in a disassembled state;

[0029] Fig.10 It shows a schematic diagram of the structure of the active transposition guide column of the present application in a disassembled state;

[0030] Fig.11 It shows a schematic structural diagram of the driven transposition guide column of the present application in a disassembled state;

[0031] Fig.12 This application shows Figure 7 Schematic diagram of the partially enlarged structure at point A in the middle.

[0032] List of reference numerals: 1. tool magazine rack; 101. upper rack plate; 102. lower rack plate; 103. parallel guide rod; 2. lifting tool seat; 201. balance support plate; 202. lifting screw hole; 203. parallel guide hole; 204. rack plate connecting cylinder; 3. guide rotary cylinder; 301. inner transmission groove; 302. tool changing sprocket wheel; 4. pulling chain; 5. movable tool clamp; 501. tool clamp support plate; 502. balance support wheel ; 6. Operation drive member; 7. Active transposition guide column; 701. Active upper connecting column; 7011. Upper connecting column core cavity; 702. Rotating connecting column; 7021. Connecting column rotating rod; 7022. Connecting column connecting cavity; 703. Active lower connecting column; 7031. Lower connecting column plug rod; 8. Driven transposition guide column; 801. Middle section support shaft; 802. Driven rotary sleeve; 9. Upgraded transposition drive member; 10. Transposition screw. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0035] The present invention proposes a double-layer external tool changing device, comprising: a tool magazine frame 1, 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 installed with a movable tool clamp 5, the front upper edge and the lower edge of the tool magazine frame 1 are respectively fixed An upper frame plate 101 and a lower frame plate 102 are connected, a running drive member 6 is installed on the upper frame plate 101 by bolts, an active transposition guide column 7 and a driven transposition guide column 8 are installed between the upper frame plate 101 and the lower frame plate 102, the driven transposition guide column 8 is located on the front left side of the tool magazine frame 1, and 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, and a transposition screw 10 is fixedly connected to the rotating shaft of the upgraded transposition drive member 9, and the transposition screw 10 is rotatably connected to the upper frame plate 101 through a bearing The lower frame plate 102 and the lifting knife seat 2 are longitudinally penetrated with a lifting screw hole 202, and 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. The active upper connecting column 701 has an upper connecting column core cavity 7011, and the upper end of the rotating connecting column 702 is fixedly connected to a connecting column rotating rod 7021. The upper end of the connecting column rotating rod 7021 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 support shaft 801 is provided in the middle of the guide column 8, and a driven rotary sleeve 802 is rotatably connected to the middle support shaft 801; the active upper connecting column 701 and the active lower connecting column 703 are always in a fixed state, and the rotating connecting column 702 is in a circumferentially active state and maintains a stable radial position, and the rotating connecting column 702 is driven by the rotating shaft of the operating driving member 6 to control the rotating connecting column 702 to rotate at a uniform speed in the circumferential direction. When the driven rotary sleeve 802 cooperates with the guide rotary cylinder 3, it plays the role of a driven wheel, positions the longitudinal height of the traction chain 4, and ensures the operating stability of the traction chain 4.

[0036] In the disclosed embodiment, 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 opened on the lifting tool seat 2, and the parallel guide holes 203 are slidably connected to the parallel guide rods 103. 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 tool seats 2. The parallel guide holes 203 and the frame plate connecting tube 204 are both slidably connected to the parallel guide rods 103, which play a guiding role, so that the two lifting tool seats 2 are parallel to the bottom surface of the tool magazine frame 1, and the distance between the two lifting tool seats 2 is kept fixed, so that the two lifting tool seats 2 are lifted and lowered synchronously.

[0037] In the disclosed embodiment, a balancing support plate 201 is fixedly connected to the lower part of the lifting tool seat 2, a tool clamp support plate 501 is fixedly connected to the lower part 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; under normal conditions, the movable tool clamp 5 is fixedly connected to the pulling chain 4, and the balancing support wheel 502 below the movable tool clamp 5 is rollingly connected to the outer edge of the balancing support plate 201, which plays a role in supporting the balancing support wheel 502, avoiding the movable tool clamp 5 from tilting due to the increase in load, and reducing the twisting pressure on the pulling chain 4, avoiding the pulling chain 4 from being twisted due to excessive eccentric pressure, resulting in chain jamming and chain derailment, effectively improving the operating 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 inner transmission groove 301 is longitudinally penetrated inside the guide rotary cylinder 3, and a longitudinally distributed tooth groove is opened on the inner wall of the inner transmission groove 301; a connecting column connection cavity 7022 is opened at the center of the lower end of the rotating connecting column 702, and the upper end of the active lower connecting column 703 is fixedly connected to the lower connecting column plug rod 7031, and the lower connecting column plug rod 7031 is rotatably connected to the inside of the connecting column connection 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 frame plate 101, and the lower end of the active lower connecting column 703 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 lower surface of the upper frame plate 101. The upper surface of the lower frame plate 102 is fixedly connected; under normal conditions, the inner transmission groove 301 is slidably connected to the outer teeth of the active transposition guide column 7 or the driven transposition guide column 8. When the left end guide rotary cylinder 3 of a set of lifting tool seats 2 is located on the driven transposition guide column 8, and the right end guide rotary cylinder 3 is located on the active upper connecting column 701 or the active lower connecting column 703, the internal tooth groove of the inner transmission groove 301 is engaged with the toothed structure on the outer surface of the column, which will circumferentially lock the guide rotary cylinder 3, making it impossible for the guide rotary cylinder 3 to rotate, and lock the traction chain 4 to avoid the traction chain 4 from being pulled. The position of the movable tool holder 5 changes; and when the positions of the two lifting tool seats 2 are adjusted so that the pulling chain 4 where the required tool is located is located in the middle position, the left end guide rotary cylinder 3 of the lifting tool seat 2 is sleeved on the driven rotary sleeve 802, and the right end guide rotary cylinder 3 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 guide rotary cylinder 3 to rotate, the tool changing sprocket 302 rotates, and the pulling chain 4 is driven to rotate on the tool changing sprockets 302 at both ends, and the driven rotary sleeve 802 rotates, through the pulling chain 4 is rotated to drive the movable tool holder 5 installed above it to move, and the movable tool holder 5 storing the required tool is transferred to a position near the manipulator, and the tool in the movable tool holder 5 is taken and placed by the manipulator. In this state, the guide rotary cylinder 3 at the left end of another set of lifting tool holders 2 is located on the driven transfer guide column 8, and the guide rotary cylinder 3 at the right end is located on the active upper connecting column 701 or the active lower connecting column 703. The guide rotary cylinder 3 is circumferentially locked by the toothed structure, so that the guide rotary cylinder 3 cannot rotate, thereby preventing the pulling chain 4 from being displaced and changing the tool position.

[0039] The working principle of this embodiment is as follows: first, a double-layer external tool changing device is installed outside the CNC machine tool, and a manipulator for tool changing of the machine tool is installed at the right end of the external tool changing device; when no tool change is required, the left end guide rotary cylinder 3 of the upper lifting tool seat 2 is sleeved on the driven transposition guide column 8, and the right end guide rotary cylinder 3 is sleeved on the active upper connecting column 701, and the left end guide rotary cylinder 3 of the lower lifting tool seat 2 is sleeved on the driven transposition guide column 8, and the right end guide rotary cylinder 3 is sleeved on the active lower connecting column 703. In this state, the driven transposition guide column 8, the active upper connecting column 701, and the active lower connecting column 703 are connected. The two lifting screw holes 202 and the two lifting tool holders 2 are driven to move upward or downward, so that the lifting tool holder 2 at the position where the required tool is located is moved to the middle position of the tool magazine frame 1, so that the left end guide rotary cylinder 3 of the lifting tool holder 2 is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the position where the required tool is located is moved to the middle position of the tool magazine frame 1, so that the left end guide rotary cylinder 3 of the lifting tool holder 2 is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the position where the required tool is located is moved to the middle position of the tool magazine frame 1, and ... sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the position where the required tool is located is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the left end is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the left end is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the left end is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the left end is sleeved on the driven rotary sleeve, and the lifting tool holder 2 at the left end is sleeved on the driven rotary sleeve, and the 802, the guide 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 guide rotary cylinder 3 to rotate, the tool changing sprocket 302 rotates, and drives the pulling chain 4 to rotate on the tool changing sprockets 302 at both ends, and the driven rotary sleeve 802 rotates. The rotation of the pulling chain 4 drives the movable tool clamp 5 installed above it to move, and the movable tool clamp 5 storing the required tool is transferred to the position near the manipulator, and the tool in the movable tool clamp 5 is taken and placed by the manipulator. At the same time, the guide rotary cylinder 3 at the left end of the other lifting tool seat 2 is located On the driven transposition guide column 8, the guide rotor 3 at the right end is located on the active upper connecting column 701 or the active lower connecting column 703, and the guide rotor 3 is circumferentially locked through the toothed structure, so that the guide rotor 3 cannot rotate, thereby locking the tool in the lifting tool holder 2; when the tool change is completed, the upgraded transposition drive component 9 is controlled to act again, and a spiral transmission is formed with the two lifting screw holes 202 during the rotation of the transposition screw 10, and the two lifting tool holders 2 are driven to rise or fall at the same time, so that the two lifting tool holders 2 are respectively located in the upper area and the lower area of ​​the rotating connecting column 702, and the double-layer tool holder is synchronously locked again.

[0040] In this article, there are a few points to note:

[0041] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0042] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may 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 technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on 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, and the pulling chain ( 4) is provided with a movable tool holder (5), the front upper edge and the lower edge of the tool magazine frame (1) are respectively fixedly connected with an upper frame plate (101) and a lower frame plate (102), a running drive member (6) is installed above the upper frame plate (101) by means of 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), and the active transposition guide column (7) is located on the front right side of the tool magazine frame (1). On the side, an upgraded transposition drive member (9) is installed above the upper frame plate (101) by bolts, and the rotating shaft of the upgraded transposition drive member (9) is fixedly connected to a transposition screw (10), and the transposition screw (10) is rotatably connected to the upper frame plate (101) and the lower frame plate (102) through a bearing, and a lifting screw hole (202) is longitudinally penetrated by the lifting knife seat (2), and the lifting screw hole (202) is spirally connected to the transposition screw (10), and 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); 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 driving member (6); the connecting column rotating rod (7021) is rotatably connected to the upper connecting column core cavity (7011) via a bearing; a middle section support shaft (801) is provided in the middle of the driven transposition guide column (8); and a driven rotating sleeve (802) is rotatably connected to the middle section support shaft (801).

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 balancing support plate (201) is fixedly connected below the lifting knife seat (2), and two parallel guide holes (203) are longitudinally penetrated through the lifting knife seat (2).

4. A double-layer external blade replacement device according to claim 1, characterized in that: An inner transmission groove (301) is longitudinally penetrated inside the guide rotary cylinder (3), and longitudinally distributed tooth grooves are formed on the inner wall of the inner transmission groove (301).

5. A double-layer external blade replacement device according to claim 3, 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).

6. 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.

7. A double-layer external blade replacement device according to claim 6, 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).

8. 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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