Pressing frame for vertical single-shaft milling machine

Abstract

The utility model relates to the technical field of milling machine devices, in particular to a material pressing frame for a vertical single-shaft milling machine, and solves the technical problems that the material pressing frame of the vertical single-shaft milling machine can only simply fix wood and does not have a rotary adjusting function, so that troubles are brought to workers. According to the technical scheme, the material pressing frame for the vertical single-shaft milling machine comprises a workbench, supporting feet, a working shaft, a guide plate, a moving assembly, an angle adjusting assembly and a material pressing assembly; through combined operation of the moving assembly, the angle adjusting assembly and the material pressing assembly, it can be guaranteed that wood can accurately move in a working area so that the wood can be machined, the wood can be adjusted to a proper angle according to the machining requirement, the wood machining efficiency is improved, and the wood machining cost is reduced. And the material pressing assembly ensures that the wood does not shake in the machining process, so that the problems of machining errors and product quality are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of milling machine devices, in particular to a pressing frame for a vertical single-spindle milling machine. Background Art

[0002] Compared with a horizontal milling machine, the spindle of a vertical milling machine is vertically arranged, and the workbench can move up and down, making the use of milling cutters relatively flexible. It can use tools such as end mills, indexable toolholders, and drills to perform various operations such as milling keyways, milling planes, and boring holes, and plays an important role in industries such as machinery manufacturing, molds, instruments, meters, automobiles, and motorcycles.

[0003] At present, when using a vertical single-spindle milling machine to process wood, the main function of the existing pressing frame is to fix and press the wood. However, in the actual processing process, if the angle of the wood needs to be adjusted, it is usually necessary to first release the fixation of the wood and then adjust the angle. This operation process not only brings great inconvenience to workers but also leads to a reduction in work efficiency.

[0004] Therefore, aiming at the situation that the pressing frame of the above-mentioned vertical single-spindle milling machine can only simply fix the wood and does not have the function of rotational adjustment, which causes trouble to workers, a pressing frame for a vertical single-spindle milling machine can be designed. Through a screw drive structure, a gear drive structure, and a belt drive structure, while fixing the wood, it is convenient to adjust the angle of the wood, thereby improving the processing efficiency of the wood. Summary of the Utility Model

[0005] In order to overcome the problem that the pressing frame of a vertical single-spindle milling machine can only simply fix the wood and does not have the function of rotational adjustment, which causes trouble to workers.

[0006] The technical solution of the utility model is as follows: A pressing frame for a vertical single-spindle milling machine includes a workbench, support feet, a working shaft, guide plates, a moving component, an angle adjustment component, and a pressing component; four groups of support feet for support are fixedly connected to the lower end of the workbench, two guide plates are installed in parallel on the upper end of the workbench, a box bin is installed between the two guide plates, a working shaft for assembling a milling cutter is installed in the box bin, a screw drive structure is arranged in the moving component and installed on the upper end of the workbench, the power output structure in the moving component is installed on the left end of the workbench, a gear drive structure is arranged in the angle adjustment component and installed on the upper end of the moving component, and a screw adjustment structure is arranged in the pressing component and installed on the upper end of the angle adjustment component.

[0007] Preferably, the workbench is the main part of the milling machine. The feet at the lower end of the workbench are used to support the entire milling machine to ensure its stability during the working process. The working axis is the core part of the milling machine, which is responsible for driving the milling cutter to rotate and machining the workpiece. A threaded transmission structure is arranged inside the moving component. The threaded transmission structure enables the moving component to move precisely along the workbench, thereby driving the wood to move on the workbench and realizing the processing of the wood. A gear transmission structure is arranged inside the angle adjustment component. The gear transmission structure enables the angle adjustment component to adjust the angle of the pressing component, thereby adjusting the angle of the wood to meet different processing requirements. A threaded adjustment structure is arranged inside the pressing component. The threaded adjustment structure enables the pressing block in the pressing component to move up and down, thereby pressing the wood tightly to ensure the stability of the wood during the processing process.

[0008] Preferably, the moving component includes a servo motor, a first threaded rod, a second threaded rod, a first rotating groove, and a moving seat; the servo motor is installed at the left end of the workbench. Two symmetrically arranged grooves are opened on the upper surface of the working groove. The right inner walls of the two grooves are both installed with a first rotating groove. The right end of the first threaded rod is rotatably connected to the first rotating groove, and the left end of the first threaded rod is fixedly connected to the output shaft of the servo motor. The right end of the second threaded rod is rotatably connected to the first rotating groove and is located in front of the first threaded rod. An internal thread adapted to the external threads of both the first threaded rod and the second threaded rod is provided in the moving seat. Both the first threaded rod and the second threaded rod are threadedly connected to the moving seat. The servo motor is the power source of the moving component. The servo motor has the characteristics of high precision and high response speed and can accurately control the speed, thereby realizing the precise movement of the moving seat and driving the wood to move on the workbench. When the servo motor is started, the first threaded rod will rotate accordingly. The second threaded rod is parallel to the first threaded rod but slightly ahead in position. Its rotation is synchronized by the first threaded rod through a belt drive method. This design enables the moving seat to be driven by the threads of both threaded rods simultaneously, realizing a more stable and precise movement. The first rotating groove allows the threaded rod to rotate freely in the groove and ensures that the threaded connection between the threaded rod and the moving seat will not loosen due to rotation.

[0009] Preferably, the moving component further includes a driving wheel, a driven wheel, and a belt; the driving wheel is fixedly connected to the outer wall of the first threaded rod, the driven wheel is fixedly connected to the outer wall of the second threaded rod, and the driving wheel and the driven wheel are jointly rotatably connected with a belt. The driving wheel and the driven wheel are connected by a belt. When the servo motor drives the first threaded rod to rotate, the driving wheel drives the driven wheel and the second threaded rod to rotate synchronously through the belt. This design can eliminate the problem of asynchronous rotation caused by the installation error of the two threaded rods and further improve the accuracy of the movement of the moving seat.

[0010] Preferably, the angle adjustment assembly includes a receiving table, a turntable, a rotating shaft, and a second rotating groove; the receiving table is installed at the upper end of the moving seat, a circular hole groove penetrating up and down is formed on the upper surface of the receiving table, the second rotating groove is installed at the bottom of the cavity provided in the receiving table, the lower end of the rotating shaft is rotatably connected to the second rotating groove, and the upper end of the rotating shaft is fixedly connected with a turntable adapted to the circular hole groove. The receiving table is used to install the turntable and the material pressing assembly, and is internally provided with a cavity for installing components such as the rotating shaft and the second rotating groove. The rotating shaft serves as the support and rotation axis of the turntable and the material pressing assembly to achieve angle adjustment. The second rotating groove provides a rotating track for the rotating shaft to ensure the stability of the rotating shaft during rotation. By rotating the turntable, the angle of the material pressing assembly can be adjusted, and then the angle of the wood can be adjusted.

[0011] Preferably, the angle adjustment assembly further includes an adjustment shaft and a first knob; the adjustment shaft is rotatably connected to the right end of the receiving table and extends leftward into the receiving table, and the right end of the adjustment shaft is fixedly connected with a first knob. By rotating the adjustment shaft, the first bevel gear can be driven to rotate, and then the rotation of the rotating shaft can be achieved through gear transmission to achieve the purpose of angle adjustment. The first knob serves as the operating handle of the adjustment shaft, facilitating the worker to perform the angle adjustment operation.

[0012] Preferably, the angle adjustment assembly further includes a first bevel gear and a second bevel gear; the first bevel gear passes through the rotating shaft and is fixedly connected to the outer wall of the rotating shaft, the second bevel gear is fixedly connected to the left end of the adjustment shaft, and the first bevel gear is meshed with the second bevel gear. The first bevel gear and the second bevel gear are connected through meshing to achieve the transmission connection between the adjustment shaft and the rotating shaft. When the first knob is rotated, the adjustment shaft will drive the second bevel gear to rotate, and then drive the first bevel gear and the rotating shaft to rotate, realizing the angle adjustment of the material pressing assembly.

[0013] Preferably, the material pressing assembly includes an L-shaped plate, an adjustment screw, a pressing block, and a second knob; the L-shaped plate is installed at the upper end of the turntable, a hole penetrating up and down is formed on the upper end of the L-shaped plate, and an internal thread adapted to the external thread of the adjustment screw is formed in the hole. The adjustment screw is threadedly connected to the hole, the upper end of the adjustment screw is integrally and fixedly connected with a second knob, and the lower end of the adjustment screw is fixedly connected with a pressing block for fixing the wood. The L-shaped plate has a horizontal part and a vertical part, and a hole penetrating up and down is formed on the upper end of the horizontal part for installing the adjustment screw. Through the L-shaped plate, the material pressing assembly can be fixed on the turntable and at the same time provide a platform for installing the adjustment screw and the pressing block. By rotating the adjustment screw, the up and down movement of the screw in the hole can be realized, and then the pressing block can be driven to press or loosen the wood. The second knob serves as the operating handle of the adjustment screw, and the worker can drive the up and down movement of the adjustment screw by rotating the second knob.

[0014] The beneficial effects of the present utility model:

[0015] 1. Through the combined operation among the moving component, the angle adjustment component and the material pressing component, it can not only ensure that the wood can move accurately within the working area for processing operations, but also be flexibly adjusted so that the wood can be adjusted to an appropriate angle according to the processing requirements, improving the efficiency of wood processing. The material pressing component ensures that the wood will not move or shake during the processing, thus avoiding processing errors and product quality problems. The coordinated work of these three components not only improves the processing accuracy and production efficiency of the wood, but also reduces the operation difficulty and manual labor intensity.

[0016] 2. The driving wheel drives the driven wheel and the second threaded rod to rotate synchronously through the belt. This design can eliminate the problem of asynchronous rotation caused by the installation error of the two threaded rods, further improving the accuracy of the movement of the moving seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a three-dimensional structural schematic diagram of the material pressing frame for a vertical single-spindle milling machine of the present utility model;

[0018] Figure 2 Shown is a front view schematic diagram of the material pressing frame for a vertical single-spindle milling machine of the present utility model;

[0019] Figure 3 Shown is a top view schematic diagram of the material pressing frame for a vertical single-spindle milling machine of the present utility model;

[0020] Figure 4 Shown is a three-dimensional structural schematic diagram of the moving component of the material pressing frame for a vertical single-spindle milling machine of the present utility model;

[0021] Figure 5 Shown is a three-dimensional structural schematic diagram of the angle adjustment component of the material pressing frame for a vertical single-spindle milling machine of the present utility model;

[0022] Figure 6 Shown is a three-dimensional structural schematic diagram of the material pressing component of the material pressing frame for a vertical single-spindle milling machine of the present utility model.

[0023] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Workbench; 2. Support feet; 3. Working shaft; 4. Guide plate; 501. Servo motor; 502. First threaded rod; 503. Second threaded rod; 504. First rotating groove; 505. Moving seat; 506. Driving wheel; 507. Driven wheel; 508. Belt; 601. Receiving table; 602. Turntable; 603. Rotating shaft; 604. Second rotating groove; 605. Adjusting shaft; 606. First knob; 607. First bevel gear; 608. Second bevel gear; 701. L-shaped plate; 702. Adjusting screw; 703. Pressing block; 704. Second knob. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Please refer to Figure 1-3 , the present utility model provides an embodiment: a pressure material frame for a vertical single-axis milling machine, including a workbench 1, support feet 2, a work shaft 3, a guide plate 4, a moving component, an angle adjustment component, and a pressure material component; four groups of support feet 2 for support are fixedly connected to the lower end of the workbench 1, two guide plates 4 are installed in parallel on the upper end of the workbench 1, a box bin is installed between the two guide plates 4, a work shaft 3 for assembling a milling cutter is installed in the box bin, a screw drive structure is provided in the moving component and installed on the upper end of the workbench 1, the power output structure in the moving component is installed on the left end of the workbench 1, a gear drive structure is provided in the angle adjustment component and installed on the upper end of the moving component, a screw adjustment structure is provided in the pressure material component and installed on the upper end of the angle adjustment component, the workbench 1 is the main part of the milling machine, the support feet 2 at the lower end of the workbench 1 are used to support the entire milling machine to ensure its stability during the working process, the work shaft 3 is the core part of the milling machine, responsible for driving the milling cutter to rotate and machining the workpiece, a screw drive structure is provided inside the moving component, and the screw drive structure enables the moving component to move precisely along the workbench 1, thereby driving the wood to move on the workbench 1 to realize the processing of the wood, a gear drive structure is provided inside the angle adjustment component, and the gear drive structure enables the angle adjustment component to adjust the angle of the pressure material component, thereby adjusting the angle of the wood to meet different processing requirements, a screw adjustment structure is provided inside the pressure material component, and the screw adjustment structure enables the pressure block 703 in the pressure material component to move up and down, thereby pressing the wood to ensure its stability during the processing.

[0026] Please refer to Figure 4, in this embodiment, the moving component includes a servo motor 501, a first threaded rod 502, a second threaded rod 503, a first rotating groove 504, and a moving seat 505; the servo motor 501 is installed at the left end of the workbench 1. Two symmetrically arranged grooves are provided on the upper surface of the working groove. The right inner walls of the two grooves are both installed with the first rotating groove 504. The right end of the first threaded rod 502 is rotatably connected to the first rotating groove 504, and the left end of the first threaded rod 502 is fixedly connected to the output shaft of the servo motor 501. The right end of the second threaded rod 503 is rotatably connected to the first rotating groove 504 and is located in front of the first threaded rod 502. The moving seat 505 is provided with internal threads that are adapted to the external threads of both the first threaded rod 502 and the second threaded rod 503. Both the first threaded rod 502 and the second threaded rod 503 are threadedly connected to the moving seat 505. The moving component further includes a driving wheel 506, a driven wheel 507, and a belt 508; the driving wheel 506 is fixedly connected to the outer wall of the first threaded rod 502, the driven wheel 507 is fixedly connected to the outer wall of the second threaded rod 503, and the driving wheel 506 and the driven wheel 507 are jointly rotatably connected with the belt 508. The servo motor 501 is the power source of the moving component. The servo motor 501 has the characteristics of high precision and high response speed, and can accurately control the speed, so as to realize the precise movement of the moving seat 505, thereby driving the wood to move on the workbench 1. When the servo motor 501 is started, the first threaded rod 502 will rotate accordingly. The second threaded rod 503 is parallel to the first threaded rod 502, but its position is slightly forward. Its rotation is realized by the synchronous rotation of the first threaded rod 502 through the belt 508 transmission method. This design enables the moving seat 505 to be simultaneously driven by the threads of the two threaded rods, realizing a more stable and precise movement. The first rotating groove 504 allows the threaded rod to freely rotate in the groove, and at the same time ensures that the threaded connection between the threaded rod and the moving seat 505 will not loosen due to rotation. The driving wheel 506 and the driven wheel 507 are connected by the belt 508. When the servo motor 501 drives the first threaded rod 502 to rotate, the driving wheel 506 drives the driven wheel 507 and the second threaded rod 503 to rotate synchronously through the belt 508. This design can eliminate the problem of asynchronous rotation caused by the installation error of the two threaded rods, and further improve the accuracy of the movement of the moving seat 505.

[0027] Please refer to Figure 5-6, in this embodiment, the angle adjustment assembly includes a receiving platform 601, a turntable 602, a rotating shaft 603, and a second rotating groove 604; the receiving platform 601 is installed at the upper end of the moving seat 505, and a circular hole groove penetrating up and down is provided on the upper surface of the receiving platform 601. The second rotating groove 604 is installed at the bottom of the cavity provided inside the receiving platform 601. The lower end of the rotating shaft 603 is rotatably connected to the second rotating groove 604. The upper end of the rotating shaft 603 is fixedly connected to a turntable 602 adapted to the circular hole groove. The angle adjustment assembly further includes an adjustment shaft 605 and a first knob 606; the adjustment shaft 605 is rotatably connected to the right end of the receiving platform 601 and extends leftward into the receiving platform 601. The right end of the adjustment shaft 605 is fixedly connected to a first knob 606. The angle adjustment assembly further includes a first bevel gear 607 and a second bevel gear 608; the first bevel gear 607 passes through the rotating shaft 603 and is fixedly connected to the outer wall of the rotating shaft 603. The second bevel gear 608 is fixedly connected to the left end of the adjustment shaft 605. The first bevel gear 607 is meshed with the second bevel gear 608. The receiving platform 601 is used to install the turntable 602 and the material pressing assembly, and is internally provided with a cavity for installing components such as the rotating shaft 603 and the second rotating groove 604. The rotating shaft 603 serves as the support and rotation axis of the turntable 602 and the material pressing assembly to achieve angle adjustment. The second rotating groove 604 provides a rotating track for the rotating shaft 603 to ensure the stability of the rotating shaft 603 during rotation. By rotating the turntable 602, the angle of the material pressing assembly can be adjusted, and then the angle of the wood can be adjusted. By rotating the adjustment shaft 605, the first bevel gear 607 can be driven to rotate, and then the rotation of the rotating shaft 603 can be achieved through gear transmission to achieve the purpose of adjusting the angle. The first knob 606 serves as the operating handle of the adjustment shaft 605, facilitating the worker to perform the angle adjustment operation. The first bevel gear 607 and the second bevel gear 608 are connected through meshing to achieve the transmission connection between the adjustment shaft 605 and the rotating shaft 603. When the first knob 606 is rotated, the adjustment shaft 605 will drive the second bevel gear 608 to rotate, and then drive the first bevel gear 607 and the rotating shaft 603 to rotate to achieve the angle adjustment of the material pressing assembly. The material pressing assembly includes an L-shaped plate 701, an adjustment screw 702, a pressing block 703, and a second knob 704;The L-shaped plate 701 is installed at the upper end of the turntable 602. There is a hole that runs through the L-shaped plate 701 vertically. An internal thread that matches the external thread of the adjusting screw 702 is provided in the hole. The adjusting screw 702 is threadedly connected to the hole. The upper end of the adjusting screw 702 is integrally and fixedly connected to a second knob 704. The lower end of the adjusting screw 702 is fixedly connected to a pressing block 703 for fixing the wood. The L-shaped plate 701 has a horizontal part and a vertical part. The upper end of the horizontal part has a hole that runs through it vertically for installing the adjusting screw 702. Through the L-shaped plate 701, the pressing component can be fixed on the turntable 602, and at the same time, a platform for installing the adjusting screw 702 and the pressing block 703 is provided. By rotating the adjusting screw 702, the up and down movement of the screw in the hole can be realized, thereby driving the pressing block 703 to press or release the wood. The second knob 704 serves as the operating handle of the adjusting screw 702, and the worker can drive the up and down movement of the adjusting screw 702 by rotating the second knob 704.;

[0028] When performing wood processing operations, the worker first places the wood on the turntable 602. Subsequently, by rotating the adjusting screw 702, the pressing degree of the pressing block 703 on the wood can be precisely controlled to ensure that the wood remains stable and immovable during the processing. Then, the servo motor 501 is started, and this motor drives the first threaded rod 502 to start rotating. At the same time, the driving wheel 506 drives the driven wheel 507 and the second threaded rod 503 to rotate synchronously through the belt 508. This threaded action causes the moving seat 505 to move horizontally, thereby driving the wood to move on the turntable 602 to achieve precise processing of the wood;

[0029] When the angle of the wood needs to be adjusted during the processing, just turn the first knob 606. This action drives the adjusting shaft 605 to rotate, thereby driving the first bevel gear 607 to rotate. Through the transmission between the gears, the rotation of the rotating shaft 603 is achieved, and finally the turntable 602 and the wood placed on it are rotated to the required angle. This operation method is not only convenient and fast but also can ensure that the angle adjustment of the wood is accurate and reliable.

[0030] Through the above steps, through the combined operation among the moving component, the angle adjusting component and the material pressing component, it can not only ensure that the wood can move accurately within the working area so as to perform processing operations on the wood, but also can be flexibly adjusted to adjust the wood to a suitable angle according to the processing requirements, improving the efficiency of wood processing. The material pressing component ensures that the wood will not move or shake during the processing, thus avoiding processing errors and product quality problems. The collaborative work of these three components not only improves the processing accuracy and production efficiency of the wood, but also reduces the operation difficulty and manual labor intensity, solving the problem that the material pressing frame of the vertical single-axis milling machine can only simply fix the wood and does not have the function of rotating adjustment, thus causing trouble to the workers.

[0031] The above has described in detail the embodiments of the present utility model in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can also be made without departing from the gist of the present utility model.

Claims

1. A material holding frame for a vertical single-axis milling machine, comprising a workbench (1), a support leg (2), a working axis (3), and a guide plate (4); characterized in that: It also includes a moving component, an angle adjustment component, and a pressing component; The lower end of the workbench (1) is fixedly connected with four groups of supporting legs (2), the upper end of the workbench (1) is parallelly mounted with two guide plates (4), a box is mounted between the two guide plates (4), a working shaft (3) for assembling a milling cutter is mounted in the box, a threaded transmission structure is arranged in the moving component and is mounted on the upper end of the workbench (1), a power output structure in the moving component is mounted on the left end of the workbench (1), a gear transmission structure is arranged in the angle adjustment component and is mounted on the upper end of the moving component, and a threaded adjustment structure is arranged in the pressing component and is mounted on the upper end of the angle adjustment component.

2. The material holding frame for a vertical single-axis milling machine according to claim 1, characterized in that: The moving assembly comprises a servo motor (501), a No. 1 threaded rod (502), a No. 2 threaded rod (503), a No. 1 rotating groove (504), and a moving seat (505); the servo motor (501) is installed at the left end of the workbench (1); the upper end surface of the working groove is provided with two grooves symmetrical in front and back; the right inner walls of the two grooves are both provided with a No. 1 rotating groove (504); the right end of the No. 1 threaded rod (502) is rotatably connected to the No. 1 rotating groove (504); The left end of the threaded rod (502) is fixedly connected to the output shaft of the servo motor (501), the right end of the second threaded rod (503) is rotatably connected to the first rotating groove (504) and is located in front of the first threaded rod (502), and the movable seat (505) is provided with an internal thread that is compatible with the external threads of the first threaded rod (502) and the second threaded rod (503), and the first threaded rod (502) and the second threaded rod (503) are both threadedly connected to the movable seat (505).

3. The material holding frame for a vertical single-axis milling machine according to claim 2, characterized in that: The moving assembly further comprises a driving wheel (506), a driven wheel (507), and a belt (508); the driving wheel (506) is fixedly connected to the outer wall of the first threaded rod (502), the driven wheel (507) is fixedly connected to the outer wall of the second threaded rod (503), and the driving wheel (506) and the driven wheel (507) are connected to the belt (508) for rotating together.

4. The material holding frame for a vertical single-axis milling machine according to claim 2, characterized in that: The angle adjustment component comprises a receiving platform (601), a rotating disk (602), a rotating shaft (603), and a second rotating groove (604); The receiving platform (601) is installed at the upper end of the movable seat (505), and a circular hole groove penetrating from top to bottom is opened on the upper end surface of the receiving platform (601). The second rotating groove (604) is installed at the bottom of the cavity provided in the receiving platform (601). The lower end of the rotating shaft (603) is rotatably connected to the second rotating groove (604), and the upper end of the rotating shaft (603) is fixedly connected to a rotating disk (602) adapted to the circular hole groove.

5. The material holding frame for a vertical single-axis milling machine according to claim 4, characterized in that: The angle adjustment assembly further comprises an adjustment shaft (605) and a first knob (606); the adjustment shaft (605) is rotatably connected to the right end of the receiving platform (601) and extends leftward into the receiving platform (601); the right end of the adjustment shaft (605) is fixedly connected to the first knob (606).

6. The material holding frame for a vertical single-axis milling machine according to claim 5, characterized in that: The angle adjustment assembly further comprises a first bevel gear (607) and a second bevel gear (608); the first bevel gear (607) passes through the rotating shaft (603) and is fixedly connected to the outer wall of the rotating shaft (603); the second bevel gear (608) is fixedly connected to the left end of the adjustment shaft (605); and the first bevel gear (607) is meshedly connected to the second bevel gear (608).

7. The material holding frame for a vertical single-axis milling machine according to claim 4, characterized in that: The material pressing assembly comprises an L-shaped plate (701), an adjusting screw rod (702), a pressing block (703), and a second knob (704); the L-shaped plate (701) is mounted on the upper end of the turntable (602); a hole is provided on the upper end of the L-shaped plate (701) and runs through the upper end and the lower end of the L-shaped plate (701); an internal thread matching the external thread of the adjusting screw rod (702) is provided in the hole; the adjusting screw rod (702) is threadedly connected in the hole; the second knob (704) is integrally fixedly connected to the upper end of the adjusting screw rod (702); and a pressing block (703) for fixing the wood is fixedly connected to the lower end of the adjusting screw rod (702).

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