Miniature drilling and carving machine

Abstract

The utility model relates to the field of drilling and carving machines, in particular to a miniature drilling and carving machine. The technical problems that when a miniature drilling and carving machine in the prior art is used, multi-axis movement adjustment is usually not convenient, effective dust prevention is difficult to carry out on a drilling area during carving, and a to-be-machined workpiece is not convenient to rapidly and stably clamp and fix are solved. According to the technical scheme, the miniature drilling and carving machine comprises a machine shell assembly; the carving machine further comprises a supporting assembly, a dustproof assembly, a carving assembly, a moving assembly and a pressing assembly. A workpiece is placed at the upper end of the moving assembly, the pressing assembly is manually adjusted to press the workpiece downwards and fix the workpiece to the moving assembly, the position of the moving assembly can be adjusted by opening the moving assembly, the drilling position can be adjusted by opening the engraving assembly, and during drilling, waste chips are prevented from flying out through the dustproof assembly during drilling, so that the drilling efficiency is improved. And in addition, the scraps can fall into the supporting assembly to be collected, and the technical problem is solved.

Description

Technical Field

[0001] The utility model belongs to the field of drilling and engraving machines, and in particular relates to a micro drilling and engraving machine. Background Art

[0002] When it is necessary to engrave workpieces such as smaller-sized plates, it is usually necessary to use a micro-drilling engraving machine for engraving. The micro-drilling engraving machine is a high-precision processing equipment that performs fine engraving and processing on the surfaces of various materials through tiny drilling and cutting processes. These machines usually use CNC systems or laser control systems to accurately control the position, depth and speed of drilling and cutting. However, the micro-drilling engraving machines in the prior art are usually not convenient for multi-axis movement adjustment when in use, and it is difficult to effectively prevent dust from the drilling area during engraving. It is also not convenient to quickly and stably clamp and fix the workpiece to be processed, which needs further improvement. Utility Model Content

[0003] In order to overcome the problems that the micro drilling and engraving machines in the prior art are usually not convenient for multi-axis movement and adjustment during use, it is difficult to effectively prevent dust from the drilling area during engraving, and it is not convenient to quickly and stably clamp and fix the workpiece to be processed.

[0004] The technical solution of the utility model is: a micro drilling and engraving machine, comprising a shell component; also comprising a supporting component, a dustproof component, an engraving component, a moving component and a pressing component; a supporting component for collecting waste is arranged at the lower end of the shell component; a dustproof component for dust prevention is arranged on the shell component; an engraving component for engraving is arranged inside the shell component; a moving component for moving is arranged at the lower end inside the shell component; a pressing component for fixing the workpiece is arranged at the upper end of the moving component.

[0005] Preferably, when in use, the workpiece is placed on the upper end of the moving component, the clamping component is manually adjusted to press the workpiece down and fix it on the moving component, the position of the moving component can be adjusted by turning on the moving component, and the position of the drilling hole can be adjusted by turning on the engraving component. When drilling, the dustproof component is used to prevent waste chips from flying out during drilling, and the waste chips will fall into the supporting component and be collected, which solves the problem that the micro-drilling engraving machine in the prior art is usually not convenient for multi-axis movement adjustment when in use, it is difficult to effectively dustproof the drilling area during engraving, and it is not convenient to quickly and stably clamp and fix the workpiece to be processed.

[0006] Preferably, the casing assembly includes an engraving machine housing and a first slot body; the first slot body is opened at the right end of the engraving machine housing, and drilling and engraving work is performed inside the first slot body to avoid waste chips from splashing.

[0007] Preferably, the support assembly includes a support block, a collection box and a handle; the support block is fixedly connected to the lower end of the engraving machine housing; the collection box is movably provided on the upper end of the support block; the right end of the collection box is fixedly connected to the handle; the upper end of the collection box is fitted with the lower end of the engraving machine housing, and the collection box can collect waste chips generated during drilling and engraving in the first groove body.

[0008] Preferably, the dustproof component includes a first L-shaped block, a second L-shaped block and a glass frame; the first L-shaped block is fixedly connected to the right end of the engraving machine housing; the second L-shaped block is fixedly connected to the inclined surface of the upper end of the engraving machine housing; the glass frame is movably arranged on the right end of the engraving machine housing; the front end face of the glass frame is in a "V"-shaped structure; the upper outer wall of the right end of the glass frame is in contact with the inner wall of the second L-shaped block; the lower outer wall of the right end of the glass frame is in contact with the inner wall of the first L-shaped block; glass is fixedly installed on the inner wall of the glass frame, and the glass frame can slide along the inner walls of the second L-shaped block and the first L-shaped block, and the glass on the inner wall of the glass frame can conveniently block the waste generated during operation in the first trough body.

[0009] Preferably, the engraving assembly includes a first electric cylinder, a rodless cylinder, a second electric cylinder, a drilling machine, a first limit block and a first limit groove; the left end of the engraving machine housing is fixedly connected to the first electric cylinder; the right end of the telescopic rod of the first electric cylinder passes through the left end of the engraving machine housing and is fixedly connected to the rodless cylinder; the second electric cylinder is fixedly connected to the slide seat of the rodless cylinder; the lower end of the telescopic rod of the second electric cylinder is fixedly connected to the drilling machine; the first limit blocks are fixedly connected to the front and rear end surfaces inside the engraving machine housing; the first limit block is in an inverted "T" shape; the lower end of the base of the rodless cylinder is provided with a first limit groove symmetrical about the center of the rodless cylinder; the inner wall of the first limit groove is in contact with the upper outer wall of the first limit block, and when it is necessary to drill a hole in the workpiece, the first electric cylinder is turned on to adjust the position of the rodless cylinder, and the rodless cylinder is turned on to allow the slide seat on the rodless cylinder to move and adjust, so that the position of the second electric cylinder can be quickly adjusted, and the second electric cylinder is turned on to allow the drilling machine to rise and fall, and the drilling machine can be turned on to facilitate drilling of the workpiece.

[0010] Preferably, the moving assembly includes a guide rail, a slider, a moving plate, a fixed seat, a servo motor, a bearing seat, a screw rod, a screw sleeve, a second limit groove and a waste groove; the lower end of the interior of the engraving machine housing is fixedly connected to two guide rails symmetrical about the center of the engraving machine housing; a slider is movably provided on the upper end of the guide rail; the upper ends of the two sliders are fixedly connected to the moving plate; the front and rear ends of the moving plate are penetrated by uniformly distributed second limit grooves; the second limit groove is penetrated at the upper end of the moving plate; the lower end of the first groove body is penetrated by two waste grooves; The interior and the interior of the collection box are interconnected; a fixed seat and a bearing seat are fixedly connected to the lower end surface of the inner shell of the engraving machine; a servo motor is fixedly connected to the left end of the fixed seat; the right end of the output shaft of the servo motor passes through the fixed seat and is fixedly connected to a screw; a wire sleeve is movably installed on the outer wall of the screw; the upper end of the wire sleeve is fixedly connected to the lower end of the movable plate, and when the movable plate needs to be moved, the servo motor is turned on to make the screw rotate, and the wire sleeve will move along the outer wall of the screw, thereby driving the movable plate to move, which is convenient for adjusting the position of the movable plate in the left and right directions.

[0011] Preferably, the clamping assembly includes a second limit block, a bearing block, a threaded column, a limit column, a movable plate, a first through hole, a second through hole and a nut; a second limit block is movably provided on the inner wall of the second limit groove; a bearing block is fixedly connected to the rear end of the second limit block; a threaded column is fixedly connected to the upper end of the bearing block; the upper end of the second limit block is fixedly connected to the limit column; a movable plate is movably provided on the upper end of the second limit block; the first through hole and the second through hole are penetrated at the upper and lower ends of the movable plate; the inner wall of the second through hole fits with the outer wall of the limit column; the first through hole The inner wall of the second through hole fits with the outer wall of the threaded column; the outer wall of the threaded column is threadedly installed with a nut, and the movable plate is placed on the upper end of the second limit block, so that the inner wall of the second through hole fits with the outer wall of the limit column, and at the same time, the inner wall of the first through hole fits with the outer wall of the threaded column, and then the nut is threadedly installed on the outer wall of the threaded column, so that the lower end of the nut presses down on the upper end of the movable plate, so that the lower end face of the movable plate presses down on the upper end face of the workpiece, and the lower end face of the workpiece fits with the upper end face of the movable plate, so that the workpiece can be quickly and stably pressed down and fixed.

[0012] Beneficial effects of the utility model:

[0013] When it is necessary to drill a hole in the workpiece, the first electric cylinder is turned on to adjust the position of the rodless cylinder. The rodless cylinder is turned on to allow the slide seat on the rodless cylinder to move and adjust, so the position of the second electric cylinder can be quickly adjusted. The second electric cylinder is turned on to allow the drilling machine to rise and fall. The drilling machine can be turned on to facilitate drilling holes in the workpiece. When it is necessary to move the movable plate, the servo motor is turned on to rotate the screw rod, and the screw sleeve will move along the outer wall of the screw rod, thereby driving the movable plate to move, so that the position of the movable plate can be adjusted in the left and right directions. This solves the problem that the micro-drilling engraving machine in the prior art is usually inconvenient for multi-axis movement and adjustment when in use.

[0014] By placing the movable plate on the upper end of the second limiting block, the inner wall of the second through hole is fitted with the outer wall of the limiting column, and the inner wall of the first through hole is fitted with the outer wall of the threaded column, and then the nut is threadedly installed on the outer wall of the threaded column, so that the lower end of the nut presses down on the upper end of the movable plate, so that the lower end face of the movable plate presses down on the upper end face of the workpiece, and the lower end face of the workpiece is fitted with the upper end face of the movable plate, so that the workpiece can be quickly and stably pressed down and fixed, which solves the problem that the micro-drilling engraving machine in the prior art is not convenient for quickly and stably clamping and fixing the workpiece to be processed when in use;

[0015] By performing drilling and engraving work inside the first slot body, waste chips can be avoided from splashing, the collection box can collect waste chips generated during drilling and engraving in the first slot body, the glass frame can slide along the inner walls of the second L-shaped block and the first L-shaped block, and the glass on the inner wall of the glass frame can be used to conveniently block the waste chips generated during work in the first slot body, thereby improving the dustproof and waste chip collection capabilities of the device, and solving the problem that it is difficult to effectively prevent dust from the drilling area when the micro drilling and engraving machine in the prior art is in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a three-dimensional structural schematic diagram of a micro drilling and engraving machine of the utility model;

[0017] Figure 2 The three-dimensional structure diagram of the housing component, the support component and the dustproof component of a micro drilling and engraving machine of the utility model is shown;

[0018] Figure 3 What is shown is a three-dimensional structural schematic diagram of an engraving component of a micro drilling and engraving machine of the utility model;

[0019] Figure 4 What is shown is a three-dimensional structural schematic diagram of a mobile component of a micro drilling and engraving machine of the utility model;

[0020] Figure 5 What is shown is a three-dimensional structural schematic diagram of a clamping component of a micro drilling and engraving machine of the utility model.

[0021] The marks in the attached drawings are: 1, housing assembly; 101, engraving machine housing; 102, first trough; 2, support assembly; 201, support block; 202, collection box; 203, handle; 3, dustproof assembly; 301, first L-shaped block; 302, second L-shaped block; 303, glass frame; 4, engraving assembly; 401, first electric cylinder; 402, rodless cylinder; 403, second electric cylinder; 404, drilling machine; 405, first limit block; 406, first limit Slot; 5, moving component; 501, guide rail; 502, slider; 503, moving plate; 504, fixed seat; 505, servo motor; 506, bearing seat; 507, screw rod; 508, thread sleeve; 509, second limiting slot; 510, waste slot; 6, clamping component; 601, second limiting block; 602, bearing block; 603, threaded column; 604, limiting column; 605, movable plate; 606, first through hole; 607, second through hole; 608, nut. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] See also Figure 1 The utility model provides an embodiment: a micro drilling and engraving machine, including a shell component 1; also including a supporting component 2, a dustproof component 3, an engraving component 4, a moving component 5 and a clamping component 6; the lower end of the shell component 1 is provided with a supporting component 2 for collecting waste; the shell component 1 is provided with a dustproof component 3 for dust prevention; the inside of the shell component 1 is provided with an engraving component 4 for engraving; the lower end of the inside of the shell component 1 is provided with a moving component 5 for moving; the upper end of the moving component 5 is provided with a clamping component 6 for fixing the workpiece.

[0024] See also Figure 2In this embodiment, the housing assembly 1 includes an engraving machine housing 101 and a first slot 102; the first slot 102 is provided at the right end of the engraving machine housing 101; the support assembly 2 includes a support block 201, a collection box 202 and a handle 203; the lower end of the engraving machine housing 101 is fixedly connected to the support block 201; the upper end of the support block 201 is movably provided with the collection box 202; the right end of the collection box 202 is fixedly connected to the handle 203; the upper end of the collection box 202 is fitted with the lower end of the engraving machine housing 101; the dustproof assembly 3 includes a first L-shaped block 30 1. The second L-shaped block 302 and the glass frame 303; the first L-shaped block 301 is fixedly connected to the right end of the engraving machine housing 101; the second L-shaped block 302 is fixedly connected to the inclined surface of the upper end of the engraving machine housing 101; the glass frame 303 is movably arranged at the right end of the engraving machine housing 101; the front end surface of the glass frame 303 is in a "V"-shaped structure; the upper outer wall of the right end of the glass frame 303 is in contact with the inner wall of the second L-shaped block 302; the outer wall of the lower right end of the glass frame 303 is in contact with the inner wall of the first L-shaped block 301; the inner wall of the glass frame 303 is fixedly installed with glass.

[0025] See also Figure 3 In this embodiment, the engraving component 4 includes a first electric cylinder 401, a rodless cylinder 402, a second electric cylinder 403, a drilling machine 404, a first limit block 405 and a first limit groove 406; the left end of the engraving machine housing 101 is fixedly connected to the first electric cylinder 401; the right end of the telescopic rod of the first electric cylinder 401 passes through the left end of the engraving machine housing 101 and is fixedly connected to the rodless cylinder 402; the second electric cylinder 403 is fixedly connected to the sliding seat of the rodless cylinder 402; the lower end of the telescopic rod of the second electric cylinder 403 is fixedly connected to the drilling machine 404; the first limit blocks 405 are fixedly connected to the front and rear end surfaces inside the engraving machine housing 101; the first limit block 405 is in an inverted "T" shape; the lower end of the base of the rodless cylinder 402 is provided with a first limit groove 406 symmetrical about the center of the rodless cylinder 402; the inner wall of the first limit groove 406 is in contact with the upper outer wall of the first limit block 405.

[0026] See also Figure 4In this embodiment, the moving assembly 5 includes a guide rail 501, a slider 502, a moving plate 503, a fixed seat 504, a servo motor 505, a bearing seat 506, a screw rod 507, a screw sleeve 508, a second limiting groove 509 and a waste groove 510; the lower end of the interior of the engraving machine housing 101 is fixedly connected to two guide rails 501 symmetrical about the center of the engraving machine housing 101; the upper end of the guide rail 501 is movably provided with a slider 502; the upper ends of the two sliders 502 are fixedly connected to the moving plate 503; the front and rear ends of the moving plate 503 are penetrated by uniformly distributed second limiting grooves 509; The second limiting groove 509 is arranged through the upper end of the movable plate 503; the lower end of the first groove body 102 is penetrated by two waste grooves 510; the interior of the waste groove 510 and the interior of the collecting box 202 are interconnected; a fixed seat 504 and a bearing seat 506 are fixedly connected to the lower end surface of the interior of the engraving machine housing 101; a servo motor 505 is fixedly connected to the left end of the fixed seat 504; the right end of the output shaft of the servo motor 505 passes through the fixed seat 504 and is fixedly connected to a screw rod 507; a wire sleeve 508 is movably installed on the outer wall of the screw rod 507; the upper end of the wire sleeve 508 is fixedly connected to the lower end of the movable plate 503.

[0027] See also Figure 5 In the present embodiment, the clamping assembly 6 comprises a second limit block 601, a bearing block 602, a threaded column 603, a limit column 604, a movable plate 605, a first through hole 606, a second through hole 607 and a nut 608; the inner wall of the second limit groove 509 is movably provided with a second limit block 601; the rear end of the second limit block 601 is fixedly connected with the bearing block 602; the upper end of the bearing block 602 is fixedly connected with the threaded column 603; the upper end of the second limit block 601 is fixedly connected with the limit column 604; the upper end of the second limit block 601 is movably provided with a movable plate 605; the upper and lower ends of the movable plate 605 are penetrated with a first through hole 606 and a second through hole 607; the inner wall of the second through hole 607 is in contact with the outer wall of the limit column 604; the inner wall of the first through hole 606 is in contact with the outer wall of the threaded column 603; the outer wall of the threaded column 603 is threadedly installed with a nut 608.

[0028] When working, first, place the movable plate 605 on the upper end of the second limiting block 601, so that the inner wall of the second through hole 607 and the outer wall of the limiting column 604 are in contact with each other, and at the same time, the inner wall of the first through hole 606 and the outer wall of the threaded column 603 are in contact with each other, and then the nut 608 is threadedly installed on the outer wall of the threaded column 603, so that the lower end of the nut 608 presses down on the upper end of the movable plate 605, so that the lower end face of the movable plate 605 presses down on the upper end face of the workpiece, and the lower end face of the workpiece is in contact with the upper end face of the movable plate 503, so that the workpiece can be quickly and stably pressed down and fixed;

[0029] Next, the first electric cylinder 401 is turned on to adjust the position of the rodless cylinder 402. The rodless cylinder 402 is turned on to allow the slide on the rodless cylinder 402 to move and adjust, so that the position of the second electric cylinder 403 can be quickly adjusted. The second electric cylinder 403 is turned on to allow the drilling machine 404 to rise and fall, so that the drill bit of the drilling machine 404 is located directly above the position of the workpiece to be drilled. The drilling machine 404 can be turned on to facilitate drilling of the workpiece.

[0030] When the movable plate 503 needs to be moved, the servo motor 505 is turned on to rotate the screw rod 507, and the screw sleeve 508 moves along the outer wall of the screw rod 507, thereby driving the movable plate 503 to move, so as to facilitate the left-right adjustment of the position of the movable plate 503;

[0031] When in use, the collection box 202 can collect the waste generated during drilling and engraving in the first trough body 102, and the glass frame 303 can slide along the inner walls of the second L-shaped block 302 and the first L-shaped block 301. The glass on the inner wall of the glass frame 303 can conveniently block the waste generated during operation in the first trough body 102.

[0032] Through the above steps, when in use, the workpiece is placed on the upper end of the moving component 5, the clamping component 6 is manually adjusted to press the workpiece down and fix it on the moving component 5, the moving component 5 can be turned on to adjust the position of the moving component 5, and the engraving component 4 can be turned on to adjust the position of the drilling hole. When drilling, the dustproof component 3 is used to prevent the waste chips from flying out during drilling, and the waste chips will fall into the supporting component 2 and be collected, which solves the problem that the micro-drilling engraving machine in the prior art is usually not convenient for multi-axis movement adjustment when in use, it is difficult to effectively dustproof the drilling area during engraving, and it is not convenient to quickly and stably clamp and fix the workpiece to be processed.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A micro drilling and engraving machine, comprising a housing assembly (1); characterized in that: The machine also comprises a support component (2), a dustproof component (3), an engraving component (4), a moving component (5) and a pressing component (6); the lower end of the housing component (1) is provided with a support component (2) for collecting waste; the housing component (1) is provided with a dustproof component (3) for dust prevention; the housing component (1) is provided with an engraving component (4) for engraving; the lower end of the housing component (1) is provided with a moving component (5) for moving; and the upper end of the moving component (5) is provided with a pressing component (6) for fixing a workpiece.

2. A micro drilling and engraving machine according to claim 1, characterized in that: The housing assembly (1) comprises an engraving machine housing (101) and a first slot body (102); the first slot body (102) is provided at the right end of the engraving machine housing (101).

3. A micro drilling engraving machine according to claim 2, characterized in that: The support assembly (2) comprises a support block (201), a collection box (202) and a handle (203); the support block (201) is fixedly connected to the lower end of the engraving machine housing (101); the collection box (202) is movably provided at the upper end of the support block (201); the handle (203) is fixedly connected to the right end of the collection box (202); and the upper end of the collection box (202) fits the lower end of the engraving machine housing (101).

4. A micro drilling engraving machine according to claim 2, characterized in that: The dustproof component (3) comprises a first L-shaped block (301), a second L-shaped block (302) and a glass frame (303); the first L-shaped block (301) is fixedly connected to the right end of the engraving machine housing (101); the second L-shaped block (302) is fixedly connected to the inclined surface of the upper end of the engraving machine housing (101); the glass frame (303) is movably arranged at the right end of the engraving machine housing (101); the front end surface of the glass frame (303) is in a "V"-shaped structure; the outer wall of the upper right end of the glass frame (303) is in contact with the inner wall of the second L-shaped block (302); the outer wall of the lower right end of the glass frame (303) is in contact with the inner wall of the first L-shaped block (301); and glass is fixedly mounted on the inner wall of the glass frame (303).

5. A micro drilling and engraving machine according to claim 2, characterized in that: The engraving assembly (4) comprises a first electric cylinder (401), a rodless air cylinder (402), a second electric cylinder (403), a drilling machine (404), a first limit block (405) and a first limit groove (406); the left end of the engraving machine housing (101) is fixedly connected to the first electric cylinder (401); the right end of the telescopic rod of the first electric cylinder (401) passes through the left end of the engraving machine housing (101) and is fixedly connected to the rodless air cylinder (402); the sliding seat of the rodless air cylinder (402) is fixedly connected to the second electric cylinder (403). The second electric cylinder (403) is provided with a drilling machine (404) at the lower end of the telescopic rod of the second electric cylinder (403); the first limiting blocks (405) are fixedly connected to the front and rear end surfaces inside the engraving machine housing (101); the first limiting blocks (405) are in an inverted "T" shape; the lower end of the base of the rodless cylinder (402) is provided with a first limiting groove (406) symmetrical about the center of the rodless cylinder (402); the inner wall of the first limiting groove (406) is in contact with the upper outer wall of the first limiting block (405).

6. A micro drilling engraving machine according to claim 3, characterized in that: The moving assembly (5) comprises a guide rail (501), a slider (502), a moving plate (503), a fixed seat (504), a servo motor (505), a bearing seat (506), a screw rod (507), a screw sleeve (508), a second limiting groove (509) and a waste groove (510); the lower end of the interior of the engraving machine housing (101) is fixedly connected to two guide rails (501) symmetrical about the center of the engraving machine housing (101); the upper end of the guide rail (501) is movably provided with a slider (502); the upper ends of the two sliders (502) are fixedly connected to the moving plate (503); the front and rear ends of the moving plate (503) are penetrated by uniformly distributed second limiting grooves (509); the second limiting grooves (509) are arranged on the second end of the moving plate (503); The limiting groove (509) is arranged through the upper end of the movable plate (503); the lower end of the first groove body (102) is penetrated by two waste grooves (510); the interior of the waste groove (510) and the interior of the collecting box (202) are mutually connected; a fixing seat (504) and a bearing seat (506) are fixedly connected to the lower end surface of the interior of the engraving machine housing (101); a servo motor (505) is fixedly connected to the left end of the fixing seat (504); the right end of the output shaft of the servo motor (505) passes through the fixing seat (504) and is fixedly connected to a screw rod (507); a thread sleeve (508) is movably installed on the outer wall of the screw rod (507); and the upper end of the thread sleeve (508) is fixedly connected to the lower end of the movable plate (503).

7. A micro drilling and engraving machine according to claim 6, characterized in that: The clamping assembly (6) comprises a second limiting block (601), a bearing block (602), a threaded column (603), a limiting column (604), a movable plate (605), a first through hole (606), a second through hole (607) and a nut (608); the second limiting block (601) is movably arranged on the inner wall of the second limiting groove (509); the bearing block (602) is fixedly connected to the rear end of the second limiting block (601); the threaded column (603) is fixedly connected to the upper end of the bearing block (602); the second limiting block (601 ... inner wall of the second limiting groove (509); the second limiting block (601) is fixedly connected to the inner wall of the second limiting groove (509); the second limiting block (601) is fixedly connected to the inner wall of the second limiting groove (509); the second limiting block (601) is fixedly connected The upper end of the positioning block (601) is fixedly connected to the limiting column (604); the upper end of the second limiting block (601) is movably provided with a movable plate (605); the upper and lower ends of the movable plate (605) are penetrated by a first through hole (606) and a second through hole (607); the inner wall of the second through hole (607) is fitted with the outer wall of the limiting column (604); the inner wall of the first through hole (606) is fitted with the outer wall of the threaded column (603); and a nut (608) is threadedly installed on the outer wall of the threaded column (603).

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