A positioning and clamping device for CNC machining

Abstract

The utility model discloses a kind of positioning clamping devices of CNC processing, more specifically in the technical field of CNC processing clamping, including lathe, the right end of the lathe is equipped with control equipment ontology, the middle of the upper end of the lathe is provided with fixed mechanism, the fixed mechanism bottom is equipped with left and right displacement mechanism, the side of the top of the lathe is equipped with front and back displacement mechanism, the top of the front and back displacement mechanism is equipped with cutting equipment ontology.The positioning clamping device of the utility model of CNC processing, when using, fixed mechanism is fixed to glass material by negative pressure adsorption, fundamentally eliminates the risk of glass surface damage even overall fragmentation caused by the reason of uneven clamping force, under the action of left and right displacement mechanism, the left and right position of fixed mechanism fixed mechanism can be adjusted, so that fixed mechanism can be accurately positioned in the lower end of cutting equipment ontology, and fixed glass material of fixed mechanism by cutting equipment ontology is processed.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining clamping technology, and in particular to a positioning and clamping device for CNC machining. Background Technology

[0002] With the rapid development of 3C electronic products (computers, communications, and consumer electronics), brittle materials such as glass are widely used in mobile phone cover plates, smart watch mirrors, tablet computer screens, and other fields due to their excellent physical properties and beautiful appearance. The processing of these high-precision glass parts usually relies on computer numerical control (CNC) machine tools for precision operations such as cutting, drilling, and chamfering. In the CNC machining process, the positioning and clamping of the workpiece are the key links to ensure processing accuracy, efficiency, and yield.

[0003] However, when processing brittle materials such as glass, the current mainstream workpiece clamping method mostly uses mechanical grippers. Mechanical grippers fix the workpiece by applying concentrated, point-like or line-like mechanical extrusion force. For high-hardness and high-brittle materials such as glass, this concentrated clamping stress is very likely to generate microcracks on the glass surface or subsurface. These microcracks may further expand during subsequent processing or product use, eventually leading to glass chipping and breakage, directly causing the workpiece to be scrapped.

[0004] In some existing technologies, the direct physical contact between the traditional clamping jaws and the glass surface can easily leave defects such as scratches and indentations, which can affect the appearance quality and yield of the final product. In addition, most cutting equipment typically operates in a serial manner of "single-piece loading, single-piece processing, and single-piece unloading". In this mode, a lot of time is consumed in non-processing auxiliary actions, which may result in low overall processing efficiency. Utility Model Content

[0005] The main purpose of this utility model is to provide a positioning and clamping device for CNC machining, which can effectively solve the problems mentioned above. In some existing technologies, the direct physical contact between the traditional clamping jaws and the glass surface can easily leave scratches, indentations and other defects, which will affect the appearance quality and yield of the final product. Moreover, most cutting equipment usually operates in a serial manner of "single-piece loading, single-piece processing, and single-piece unloading". In this mode, a lot of time is consumed in non-processing auxiliary actions, which may lead to low overall processing efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A positioning and clamping device for CNC machining includes a machine tool, a control device body is installed at the right end of the machine tool, a fixing mechanism is provided in the middle of the upper part of the machine tool, a left and right displacement mechanism is installed at the bottom of the fixing mechanism, a front and back displacement mechanism is installed on the side of the top of the machine tool, and a cutting device body is installed on the top of the front and back displacement mechanism.

[0008] Preferably, the bottom of the left and right displacement mechanism is mounted in the middle of the top of the machine tool.

[0009] Preferably, a cleaning mechanism is installed on the front side of the outer surface of the left and right displacement mechanism.

[0010] Preferably, the fixing mechanism includes a fixing platform, on the top of the fixing platform are negative pressure components symmetrically mounted around the circumference, and each of the negative pressure components is equipped with a suction cup on its top. A rotating shaft is installed in the middle of the bottom of the fixing platform, and a bearing bracket is rotatably connected to the outer surface of the rotating shaft. A drive motor is rotatably connected to the bottom of the rotating shaft.

[0011] Preferably, the left and right displacement mechanism includes a mounting bracket, the bearing bracket and the bottom of the drive motor are both mounted on the top of the mounting bracket, a protective top plate is provided at the lower end of the mounting bracket, a mounting base is installed at the bottom of the protective top plate, and movable seats are symmetrically slidably connected to the inner surface of the mounting base, and threaded rods are threadedly connected to the inner surfaces of the two movable seats.

[0012] Preferably, a drive assembly is installed on the left end of both threaded rods. The middle of the right end of the drive assembly is installed on the middle of the left end of the mounting base. A bottom frame is installed on the bottom of the mounting base. The two movable seats are respectively fixedly connected to the front and rear sides of the bottom of the mounting bracket. The mounting bracket is slidably connected to the bottom frame.

[0013] Preferably, the cleaning mechanism includes an outer frame, which is disposed outside the bottom frame. Push plates are symmetrically slidably connected to the inner surface of the outer frame. Electric telescopic rods are installed at the front ends of the two push plates, and mounting plates are installed at the front ends of the two electric telescopic rods.

[0014] Preferably, the front-to-back displacement mechanism includes two mounting seats, which are symmetrically arranged on the left and right sides of the top of the machine tool near the outer frame. Movable components are provided on opposite sides of the inner surfaces of the two mounting seats. A second drive component is installed at the front end of the two movable components. The left and right sides of the rear end of the mounting plate are respectively installed on the opposite sides of the front end of the two mounting seats. The middle of the rear end of the second drive component is installed at the middle of the front end of the mounting plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This device utilizes a designed fixing mechanism that uses negative pressure adsorption to fix the glass material. Traditional clamping uses mechanical grippers to fix the workpiece by applying concentrated, point-like or line-like mechanical extrusion force. For brittle materials like glass, this concentrated stress can easily cause micro-cracks at the clamping point. This device uses suction cups to form a sealed space with the glass surface, creating a vacuum to generate an atmospheric pressure difference between the inside and outside, thereby obtaining a huge positive pressure evenly distributed across the entire adsorption surface. This pressure is "surface contact" rather than "point contact," fundamentally eliminating the risk of scratches, indentations, chipping, or even overall breakage of the glass surface caused by excessive or uneven clamping force or burrs at the contact point. Furthermore, multiple negative pressure components and suction cups are provided, allowing multiple glass materials to be loaded simultaneously. Then, by rotating the fixed table, individual materials can be cut and processed by the cutting equipment body. Compared to the method of loading and processing single pieces of glass, this method helps to improve the overall processing efficiency to a certain extent.

[0017] 2. This device, through its designed left-right displacement mechanism, allows for adjustment of the left-right position of the fixing mechanism. This enables the fixing mechanism to be precisely positioned at the lower end of the cutting equipment body, allowing the cutting equipment body to process the glass material fixed at the fixing mechanism. By adding an independent "left-right displacement mechanism," the workpiece itself possesses an active and high-precision degree of freedom of movement. Even though the cutting equipment body has a limited travel distance, the coordinated movement of the left-right displacement mechanism enables "relay" processing, allowing for workpiece processing on a smaller machine tool that far exceeds its inherent travel distance. For complex cutting patterns, the cutting equipment body can handle the fine contour cutting, while the left-right displacement mechanism handles the large-travel rapid feed and repositioning. This collaborative processing mode allows for the planning of better tool paths, reduces idle travel time, and improves processing efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial cross-sectional view of the cleaning mechanism of this utility model;

[0020] Figure 3 This is a schematic diagram of the explosion effect structure of the fixing mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the explosion effect structure of the left and right displacement mechanism of this utility model;

[0022] Figure 5 This is a partial cross-sectional view of the front and rear displacement mechanism of this utility model.

[0023] In the diagram: 1. Machine tool; 2. Control device body; 3. Fixing mechanism; 301. Fixing table; 302. Negative pressure component; 303. Suction cup; 304. Rotating shaft; 305. Bearing bracket; 306. Drive motor; 4. Left and right displacement mechanism; 401. Mounting bracket; 402. Protective top plate; 403. Mounting base; 404. Moving seat; 405. Threaded rod; 406. Drive component one; 407. Bottom frame; 5. Cleaning mechanism; 501. Outer frame; 502. Push plate; 503. Electric telescopic rod; 504. Mounting plate; 6. Front and rear displacement mechanism; 601. Mounting base; 602. Moving component; 603. Drive component two; 7. Cutting equipment body. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] Example 1, as Figure 1 As shown, a positioning and clamping device for CNC machining includes a machine tool 1, a control device body 2 installed at the right end of the machine tool 1, a fixing mechanism 3 set in the middle of the upper end of the machine tool 1, a left and right displacement mechanism 4 installed at the bottom of the fixing mechanism 3, a front and back displacement mechanism 6 installed on the side of the top of the machine tool 1, and a cutting device body 7 installed on the top of the front and back displacement mechanism 6.

[0026] In this embodiment, the operator starts the device by controlling the main body 2. First, the glass material to be processed is placed on the suction cup 303 above the fixed platform 301 of the fixing mechanism 3. It is then adsorbed and fixed by the fixing mechanism 3. Then, the position of the fixing mechanism 3 can be adjusted left and right by the left and right displacement mechanism 4, and the front and back position of the cutting device body 7 can be adjusted by the front and back displacement mechanism 6. Under the action of the cutting device body 7, the glass material fixed on the top of the fixing mechanism 3 can be cut and processed.

[0027] For details, please refer to Figure 1 In this embodiment, the bottom of the left and right displacement mechanism 4 is installed in the middle of the top of the machine tool 1, and a cleaning mechanism 5 is installed on the front side of the outer surface of the left and right displacement mechanism 4.

[0028] Further reference Figure 1 and Figure 3 In this embodiment, the fixing mechanism 3 includes a fixing platform 301, negative pressure components 302 are symmetrically installed on the top circumference of the fixing platform 301, suction cups 303 are installed on the top of several negative pressure components 302, a rotating shaft 304 is installed in the middle of the bottom of the fixing platform 301, a bearing bracket 305 is rotatably connected to the outer surface of the rotating shaft 304, and a drive motor 306 is rotatably connected to the bottom of the rotating shaft 304.

[0029] The glass material to be processed is placed on the suction cup 303 above the fixed platform 301 of the fixing mechanism 3. The negative pressure component 302 is started, and the negative pressure pump inside it starts to work. Air is drawn out through the sealed space formed between the suction cup 303 and the glass surface, generating an atmospheric pressure difference between the inside and outside. Using this uniformly distributed atmospheric pressure, the glass material is stably adsorbed on the fixed platform 301. Since multiple negative pressure components 302 and suction cups 303 are symmetrically arranged on the top circumference of the fixed platform 301, multiple glass materials can be fed and fixed at the same time, preparing for batch processing.

[0030] A cable chain is installed at the negative pressure component 302. The cables and air pipes that supply power and air to the negative pressure component 302 are placed in the internal cavity of the cable chain, thus being effectively protected. One end of the cable chain is fixed to the stationary part, and the other end is fixed to the rotating fixed platform 301. When the fixed platform 301 rotates, the cable chain will form a smooth curved arc to guide the movement of the pipeline and avoid direct force, wear or entanglement.

[0031] After the fixed platform 301 rotates one revolution, the drive motor 306 drives the fixed platform 301 to rotate in reverse, rotating one revolution clockwise and one revolution counterclockwise, thereby avoiding the situation of wires and air pipes getting tangled.

[0032] After the first glass material is processed, there is no need to stop the machine to remove the material. The control device body 2 starts the drive motor 306 at the bottom of the fixing mechanism 3. The drive motor 306 drives the fixed table 301 and all the glass materials fixed on it to rotate together by a preset angle through the rotating shaft 304. After the rotation is in place, the left and right displacement mechanism 4 is started again to move the next glass material to be processed to the bottom of the cutting device body 7 and repeat the cutting process of step two. Through the cycle mode of "fixing-rotating-reprocessing", the continuous and automated processing of multiple materials is realized, which greatly improves the overall processing efficiency.

[0033] The fixed mechanism 3, designed to fix the glass material, uses negative pressure adsorption to fix it. Traditional clamping uses mechanical grippers to fix the workpiece by applying concentrated, point-like or line-like mechanical extrusion force. For brittle materials like glass, this concentrated stress can easily cause micro-cracks at the clamping point. This device uses the suction cup to form a closed space with the glass surface, and creates a vacuum to generate an internal and external atmospheric pressure difference, thereby obtaining a huge positive pressure evenly distributed across the entire adsorption surface. This pressure is "surface contact" rather than "point contact," fundamentally eliminating the risk of scratches, indentations, chipping, or even overall breakage of the glass surface caused by excessive or uneven clamping force or burrs at the contact point. Furthermore, multiple negative pressure components 302 and suction cups 303 are provided, allowing multiple glass materials to be loaded simultaneously. Then, by rotating the fixed table 301, a single material can be cut and processed by the cutting equipment body 7. Compared to the method of loading and processing a single piece of glass, this method helps to improve the overall processing efficiency to a certain extent.

[0034] Example 2: Based on Example 1, this example adds a left-right displacement mechanism 4 to adjust the position of the fixed mechanism 3, and a front-back displacement mechanism 6 to adjust the front-back position of the cutting equipment body 7. By setting the left-right displacement mechanism 4 and the front-back displacement mechanism 6, the workpiece itself has an active and high-precision degree of freedom of movement. Even if the movement stroke of the cutting equipment body 7 is limited, the coordinated movement of the left-right displacement mechanism 4 can realize "relay" processing, thereby completing workpiece processing far exceeding its inherent stroke on a smaller machine tool.

[0035] For details, please refer to Figure 1 , Figure 3 and Figure 4 In this embodiment, the left and right displacement mechanism 4 includes a mounting bracket 401. The bottom of the bearing bracket 305 and the drive motor 306 are both mounted on the top of the mounting bracket 401. A protective top plate 402 is provided at the lower end of the mounting bracket 401. A mounting base 403 is installed at the bottom of the protective top plate 402. The inner surface of the mounting base 403 is symmetrically and slidably connected with movable seats 404. The inner surfaces of the two movable seats 404 are threadedly connected with threaded rods 405.

[0036] Further reference Figure 1 and Figure 4 In this embodiment, the left ends of the two threaded rods 405 are jointly equipped with a drive assembly 406. The middle of the right end of the drive assembly 406 is installed in the middle of the left end of the mounting base 403. The bottom frame 407 is installed at the bottom of the mounting base 403. The two movable seats 404 are respectively fixedly connected to the front and rear sides of the bottom of the mounting bracket 401. The mounting bracket 401 and the bottom frame 407 are slidably connected.

[0037] After the device is fixed, it enters the processing and positioning stage. In this stage, the left and right displacement mechanism 4 and the front and rear displacement mechanism 6 work together to achieve high-precision and wide-range processing capabilities.

[0038] The control device body 2 controls the start of the drive assembly 406. The drive motor inside the drive assembly 406 is driven by a bevel gear set to synchronously drive the two threaded rods 405 to rotate. Since the moving seat 404 is threadedly connected to the threaded rod 405 and is constrained by the mounting base 403, the rotation of the threaded rod 405 will drive the two moving seats 404 to slide precisely left and right synchronously within the mounting base 403. The moving seat 404 drives the entire mounting bracket 401 above it and the fixing mechanism 3 to move left and right together, thereby accurately moving the first glass material to be processed to the bottom of the cutting device body 7, completing the Z-axis positioning before processing.

[0039] Further reference Figure 1 , Figure 2 and Figure 4 In this embodiment, the cleaning mechanism 5 includes an outer frame 501, which is located on the outside of the bottom frame 407. Push plates 502 are symmetrically slidably connected to the inner surface of the outer frame 501. Electric telescopic rods 503 are installed at the front ends of the two push plates 502, and mounting plates 504 are installed at the front ends of the two electric telescopic rods 503.

[0040] During processing, glass fragments are constantly generated. In order to maintain a clean processing environment and prevent the fragments from affecting positioning accuracy or damaging the equipment, this device integrates an automatic cleaning function. When a cleaning program is set separately, the electric telescopic rod 503 of the cleaning mechanism 5 is activated, pushing the mounting plate 504 and the two push plates 502 to slide left and right within the outer frame 501. The sliding action of the push plates 502 can effectively push the glass fragments accumulated in the bottom processing area to the external collection area, realizing the simultaneous processing and cleaning, and providing a guarantee for the next high-precision positioning and processing.

[0041] Further reference Figure 1 , Figure 2 and Figure 5 In this embodiment, the front and rear displacement mechanism 6 includes two mounting seats 601. The two mounting seats 601 are symmetrically arranged on the left and right sides of the top of the machine tool 1 near the outside of the outer frame 501. The opposite sides of the inner surfaces of the two mounting seats 601 are provided with moving components 602. The front ends of the two moving components 602 are jointly mounted with a second driving component 603. The left and right sides of the rear end of the mounting plate 504 are respectively mounted on the opposite sides of the front ends of the two mounting seats 601. The middle of the rear end of the second driving component 603 is mounted on the middle of the front end of the mounting plate 504.

[0042] After the left and right positioning is completed, the control device body 2 controls the drive component 603 of the front and rear displacement mechanism 6 to start. Its working principle is similar to that of the drive component 406. The drive motor drives the threaded rod of the moving component 602 in the two mounting seats 601 to rotate through the transmission mechanism, thereby driving the mounting plate 504 and the cutting device body 7 mounted on it to move precisely in the front and rear X-axis direction. Combined with the cutting device body 7's own ability to move in the up and down Y-axis direction, the cutting device body 7 has the ability to precisely position and cut the workpiece in three-dimensional space. The control device body 2 controls the cutting device body 7 to cut the first glass material according to the preset program.

[0043] After all the glass materials fixed on the fixed table 301 have been processed, the control equipment body 2 controls the negative pressure component 302 to stop working, and fills the suction cup 303 with air or connects it to the atmosphere. The negative pressure disappears, and the processed glass materials can be easily removed, and the entire workflow ends.

[0044] By designing the left and right displacement mechanism 4, the left and right positions of the fixing mechanism 3 can be adjusted, allowing the fixing mechanism 3 to be precisely positioned at the lower end of the cutting equipment body 7. The cutting equipment body 7 then processes the glass material fixed at the fixing mechanism 3. By adding an independent "left and right displacement mechanism 4", the workpiece itself has an active and high-precision degree of freedom of movement. Even if the travel of the cutting equipment body 7 is limited, the coordinated movement of the left and right displacement mechanism 4 can achieve "relay" processing, thereby completing workpiece processing far exceeding its inherent travel on a smaller machine tool. For complex cutting patterns, the cutting equipment body 7 can be responsible for fine contour cutting, while the left and right displacement mechanism 4 can be responsible for large-stroke rapid feed and repositioning. This division of labor and cooperation processing mode can plan a better tool path, reduce idle travel time, and improve processing efficiency.

[0045] The machine tool 1 in this solution can be a CNC machine tool using existing technology;

[0046] The control device body 2 in this solution can be a control device used for CNC control in the prior art;

[0047] The cutting equipment body 7 in this solution can be any existing cutting equipment with adjustable vertical height used for CNC3C glass cutting.

[0048] The negative pressure assembly 302 in this solution includes the existing mounting enclosure and negative pressure pump;

[0049] The movable component 602 in this solution includes a movable seat and a threaded rod as in the prior art, and the movable seat and the threaded rod are rotatably connected by a thread;

[0050] Both drive assembly 406 and drive assembly 603 in this solution include a drive box, a transmission shaft, and a bevel gear set as in the prior art. The drive box includes a mounting box, a drive motor, and a controller as in the prior art. The drive motor and controller are installed inside the mounting box. The controller here can be a motor controller that is compatible with the drive motor in the prior art. It can control the switching and rotation speed of the drive motor. The drive box drives the transmission shaft to rotate, which drives one of the bevel gears to rotate, thereby driving the other bevel gear to rotate. The other bevel gear is installed and fixed on the threaded rod 405 or the threaded rod at the moving assembly 602, thereby achieving the effect of driving and transmission.

[0051] In this design, the threads of the two threaded rods 405 are set in opposite directions, and the threads of the two moving components 602 are also set in opposite directions.

[0052] In this solution, a protective frame is provided on the outside of the drive component 2 603. The protective frame can physically isolate the bevel gear set and the drive shaft at this location, thereby effectively preventing the exposed tooth structure of the bevel gear from causing accidental injury to the operator when it is running at high speed. Such safety hazards include clothing or hair getting caught or limbs touching the gear. At the same time, it can also prevent foreign objects such as dust and metal shavings from entering the gear meshing area, reducing tooth surface wear or jamming caused by impurities.

[0053] Since the above are all very mature products in the prior art, they will not be described in detail in this application.

[0054] It should be noted that the specific installation methods, circuit connections, and control methods of the drive motor 306, drive component one 406, drive component two 603, and negative pressure component 302 used in this utility model are all conventional designs, and will not be described in detail here. The above shows and describes the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A positioning and clamping device for CNC machining, comprising a machine tool (1), characterized in that: The machine tool (1) is equipped with a control device body (2) on the right end, a fixing mechanism (3) is provided in the middle of the upper end of the machine tool (1), a left and right displacement mechanism (4) is installed at the bottom of the fixing mechanism (3), a front and back displacement mechanism (6) is installed on the side of the top of the machine tool (1), and a cutting device body (7) is installed on the top of the front and back displacement mechanism (6). A cleaning mechanism (5) is installed on the front side of the outer surface of the left and right displacement mechanism (4); The fixing mechanism (3) includes a fixing platform (301), on which negative pressure components (302) are symmetrically installed around the top of the fixing platform (301), and suction cups (303) are installed on the top of several negative pressure components (302). A rotating shaft (304) is installed in the middle of the bottom of the fixing platform (301), and a bearing bracket (305) is rotatably connected to the outer surface of the rotating shaft (304). A drive motor (306) is rotatably connected to the bottom of the rotating shaft (304).

2. The positioning and clamping device for CNC machining according to claim 1, characterized in that: The bottom of the left and right displacement mechanism (4) is installed in the middle of the top of the machine tool (1).

3. The positioning and clamping device for CNC machining according to claim 2, characterized in that: The left and right displacement mechanism (4) includes a mounting bracket (401). The bottom of the bearing bracket (305) and the drive motor (306) are both mounted on the top of the mounting bracket (401). A protective top plate (402) is provided at the lower end of the mounting bracket (401). A mounting base (403) is installed at the bottom of the protective top plate (402). The inner surface of the mounting base (403) is symmetrically connected to a movable seat (404) in the front and back and left and right. The inner surfaces of the two movable seats (404) are threaded with threaded rods (405).

4. The positioning and clamping device for CNC machining according to claim 3, characterized in that: The left ends of the two threaded rods (405) are jointly equipped with a drive assembly (406). The middle of the right end of the drive assembly (406) is installed at the middle of the left end of the mounting base (403). The bottom frame (407) is installed at the bottom of the mounting base (403). The two movable seats (404) are respectively fixedly connected to the front and rear sides of the bottom of the mounting bracket (401). The mounting bracket (401) and the bottom frame (407) are slidably connected.

5. A positioning and clamping device for CNC machining according to claim 4, characterized in that: The cleaning mechanism (5) includes an outer frame (501), which is located on the outside of the bottom frame (407). Push plates (502) are symmetrically slidably connected to the inner surface of the outer frame (501). Electric telescopic rods (503) are installed at the front ends of the two push plates (502), and mounting plates (504) are installed at the front ends of the two electric telescopic rods (503).

6. The positioning and clamping device for CNC machining according to claim 5, characterized in that: The front and rear displacement mechanism (6) includes two mounting seats (601). The two mounting seats (601) are symmetrically arranged on the left and right sides of the top of the machine tool (1) near the outside of the outer frame (501). The inner surfaces of the two mounting seats (601) are provided with moving components (602) on opposite sides. The front ends of the two moving components (602) are jointly mounted with a second drive component (603). The left and right sides of the rear end of the mounting plate (504) are respectively mounted on the opposite sides of the front ends of the two mounting seats (601). The middle of the rear end of the second drive component (603) is mounted in the middle of the front end of the mounting plate (504).

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