Tinned copper wire polishing mechanism

Abstract

The present invention discloses a tinned copper wire polishing mechanism, which relates to the technical field of copper wire polishing. The mechanism comprises a mounting plate and a copper wire body. A take-up roller and a pay-off roller are provided on the upper side of the mounting plate. A fixed frame is fixedly connected to the upper side of the mounting plate and located between the take-up roller and the pay-off roller. A first fixed plate is fixedly connected to the left and right sides of the fixed frame. A stabilizing unit is provided on the inner side of the fixed frame. The stabilizing unit comprises a second fixed plate, which is fixedly connected to the left and right sides of the fixed frame. The tinned copper wire polishing mechanism achieves a polishing process on the copper wire through the cooperation of the fixed frame, a lower polishing wheel, and an upper polishing wheel. At the same time, by means of the linkage of a lifting plate, a connecting plate, a side plate, an L-shaped plate, a moving rod, a contact plate, and the stabilizing roller, the stabilizing rollers on the front and rear sides are driven to move toward each other during the descent of the upper polishing wheel, thereby clamping the copper wire in the polishing area to enhance stability, thereby avoiding vibration and the noise generated thereby.

Description

Technical Field

[0001] The invention relates to the technical field of copper wire polishing, in particular to a tinned copper wire polishing mechanism. Background Art

[0002] Tinned copper wire is a composite metal wire coated with a layer of tin on the surface of the copper wire. It combines the excellent conductivity of copper with the anti-oxidation and corrosion resistance of tin. Before tinning, the copper wire needs to be polished.

[0003] After searching, the Chinese patent with authorization announcement number CN221390475U discloses an anti-loosening enameled copper wire polishing machine, including a bottom shell, a top cover is arranged above the bottom shell, lower bases are fixedly installed at both ends of the inner bottom of the bottom shell, positioning parts are fixedly connected on both sides of the top of the top cover, and adjusting screws located on the inner side of the positioning parts are penetrated on both sides of the top of the top cover, and the bottom end of the adjusting screw is movably mounted with an upper base located on the inner side of the top cover.

[0004] In the above patent, the surface of the copper wire is polished by adjusting the screw to control the descent of the polishing part, but only the two ends of the copper wire are limited during polishing, and no synchronous limiting structure is set in the polishing area, which causes the copper wire to vibrate easily when it is directly subjected to force in the polishing position, and then causes the copper wire to intermittently collide with the polishing part (such as a grinding wheel, a guide wheel) or the equipment structure that should be limited (such as a limit ring), generating noise, which not only endangers the physical and mental health of the workers, but also reduces the polishing accuracy due to the collision deviation caused by the vibration. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a tinned copper wire polishing mechanism, which solves the problem that the copper wire polishing area is not limited and is prone to noise.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A tinned copper wire polishing mechanism comprises a mounting plate and a copper wire body, a take-up roller and a pay-off roller are provided on the upper side of the mounting plate, a fixing frame is fixedly connected to the upper side of the mounting plate and located between the take-up roller and the pay-off roller, a fixing plate 1 is fixedly connected to the left and right sides of the fixing frame, a stabilizing unit is provided on the inner side of the fixing frame, and the stabilizing unit comprises a fixing plate 2, and the fixing plate 2 is fixedly connected to the left and right sides of the fixing frame, two bottom blocks are fixedly connected to the upper side of the mounting plate, a lower polishing roller is provided between the two bottom blocks, and a stabilizing component is provided on the inner wall of the fixing frame, and the stabilizing component is used to stabilize the copper wire body in the polishing area;

[0008] The stabilizing assembly includes an electric push rod, which is fixedly connected to the upper inner wall of the fixed frame, the lower end of the electric push rod is fixedly connected to a lifting plate, the lower side of the lifting plate is fixedly connected to two bottom plates, a rotating rod is rotatably connected between the two bottom plates, the outer side of the rotating rod is fixedly connected to an upper polishing roller, the front side of the bottom plate is fixedly connected to a motor that drives the rotating rod to rotate, the left and right sides of the bottom plate are fixedly connected to connecting plates, and the outer side of the connecting plate is fixedly connected to a side plate;

[0009] The front and rear sides of the side plates on both sides are fixedly connected with L-shaped plates, and the outer sides of the L-shaped plates on both sides are provided with moving rods. The end of the moving rod close to the copper wire body passes through the outer side of the L-shaped plate and is fixedly connected to the moving plate. The upper and lower sides of the moving plate are fixedly connected with mounting blocks, and a plurality of stabilizing rollers are rotatably connected between the mounting blocks on the upper and lower sides.

[0010] Preferably, the other end of the moving rod is fixedly connected to a control plate, and the outer sides of the control plates on both sides are fixedly connected to a rotating block 1, and the outer sides of the two rotating blocks 1 are rotatably connected to an inclined plate 1, and the outer side of the inclined plate 1 is rotatably connected to a rotating block 2, and the rotating block 2 is fixedly connected to a control block 1 on a side away from the connecting plate, and the upper side of the control block 1 is fixedly connected to a rotating block 3, and the outer side of the rotating block 3 is rotatably connected to the inclined plate 2, and the outer side of the inclined plate 2 is rotatably connected to a rotating block 4, and the outer side of the rotating block 4 is fixedly connected to the moving block 1, and the lower side of the moving block 1 is fixedly connected to a lifting rod, and the lower end of the lifting rod passes through the lower side of the side plate and is fixedly connected to the moving block 2, and the fixed plate 2 on both sides is fixedly connected to a contact plate on one side close to the moving block 2, and the outer side of the contact plate is fixedly connected to an electromagnet.

[0011] Preferably, a slide groove is provided on the upper side of the side panel, a slider is slidably connected to the inner side of the slide groove, the slider is fixedly connected to the control block 1, a top block is fixedly connected to the upper side of the side panel, and a telescopic rod and a spring are fixedly connected between the top block and the control block 1.

[0012] Preferably, a fixed tube is fixedly connected between the two L-shaped plates on the same side, an absorption head is fixedly connected to the lower side of the fixed tube, a connecting tube is fixedly connected between the two fixed tubes, a vacuum cleaner is fixedly connected to the upper side of the fixed frame, and a delivery tube is fixedly connected between the vacuum cleaner and the connecting tube.

[0013] Preferably, a closing component is provided on the outer side of the second fixed plate, and the closing component includes a storage slot, which is opened on the lower side of the second fixed plate, and a closing plate is provided on the inner side of the storage slot. Arc grooves are provided on the outer sides of the closing plate and the first fixed plate, and a lifting groove is provided on the side of the second fixed plate close to the lifting plate, and a lifting block is slidably connected to the inner side of the lifting groove, and the lifting block is fixedly connected to the closing plate, and a control block 2 is fixedly connected between the lifting plate and the closing plate, and an observation window is provided on the front side of the fixed frame.

[0014] The tinned copper wire polishing mechanism provided by the present invention has the following beneficial effects compared with the prior art:

[0015] (1) The tinned copper wire polishing mechanism realizes the polishing of the copper wire through the cooperation of the fixed frame, the lower polishing wheel and the upper polishing wheel. At the same time, with the help of the linkage of the lifting plate, the connecting plate, the side plate, the L-shaped plate, the moving rod, the contact plate and the stabilizing roller, the stabilizing rollers on the front and rear sides are driven to move toward each other during the descent of the upper polishing wheel, clamping the copper wire in the polishing area to enhance stability, thereby avoiding vibration and the resulting noise.

[0016] (2) The tinned copper wire polishing mechanism, through the coordination of fixed plate 1, fixed plate 2, storage tank, closing plate, lifting plate and control block 2, synchronously drives the closing plates on both sides to descend during the copper wire polishing, thereby blocking the noise and debris generated by polishing and reducing the impact on the workers.

[0017] (3) The tinned copper wire polishing mechanism, through the cooperation of the fixed tube, the absorption head, the connecting tube, the conveying tube and the vacuum cleaner, absorbs the debris generated during the copper wire polishing process synchronously, thereby keeping the working environment clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the stabilizing component in the present invention;

[0021] Figure 4 It is a schematic diagram of a partial three-dimensional structure of the stabilizing component of the present invention;

[0022] Figure 5 Schematic diagram of the three-dimensional structure of the side panel in the present invention;

[0023] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0024] Figure 7It is a schematic diagram of a partial three-dimensional structure of the side panel in the present invention;

[0025] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0026] Figure 9 It is a partially cutaway three-dimensional structural diagram of the present invention.

[0027] In the figure: 1. Mounting plate; 2. Take-up roller; 3. Pay-off roller; 4. Fixing frame; 5. Vacuum cleaner; 6. Observation window; 7. Stabilizing unit; 8. Copper wire body; 9. Fixing plate 1; 71. Bottom block; 72. Lower polishing roller; 73. Fixing plate 2; 74. Stabilizing assembly; 75. Closing assembly; 741. Electric push rod; 742. Lifting plate; 743. Bottom plate; 744. Rotating rod; 745. Upper polishing roller; 746. Connecting plate; 747. Side plate; 748. L-shaped plate; 749. Fixing pipe; 7410. Absorbing head; 7411. Connecting pipe; 7412. Delivery pipe; 7413. Moving rod; 7414. Moving plate; 7415. Mounting block; 74 16. Stabilizing roller; 7417. Control board; 7418. Rotating block 1; 7419. Inclined plate 1; 7420. Top block; 7421. Telescopic rod; 7422. Spring; 7423. Slide; 7424. Slider; 7425. Control block 1; 7426. Rotating block 2; 7427. Rotating block 3; 7428. Inclined plate 2; 7429. Rotating block 4; 7430. Moving block 1; 7431. Lifting rod; 7432. Moving block 2; 7433. Contact plate; 7434. Electromagnet; 7435. Motor; 751. Storage tank; 752. Closing plate; 753. Lifting tank; 754. Lifting block; 755. Control block 2; 756. Arc slot. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1 - Figure 9The tinned copper wire polishing mechanism of the present invention includes a mounting plate 1 and a copper wire body 8. A take-up roller 2 and a pay-off roller 3 are provided on the upper side of the mounting plate 1. A fixing frame 4 is fixedly connected to the upper side of the mounting plate 1 and located between the take-up roller 2 and the pay-off roller 3. A fixing plate 1 9 is fixedly connected to the left and right sides of the fixing frame 4. A stabilizing unit 7 is provided on the inner side of the fixing frame 4. The stabilizing unit 7 includes a fixing plate 2 73. The fixing plate 2 73 is fixedly connected to the left and right sides of the fixing frame 4. Two bottom blocks 71 are fixedly connected to the upper side of the mounting plate 1. A lower polishing roller 72 is provided between the two bottom blocks 71. A stabilizing component 74 is provided on the inner wall of the fixing frame 4. The stabilizing component 74 is used to stabilize the copper wire body 8 in the polishing area. The take-up roller 2 and the pay-off roller 3 are provided to facilitate the movement of the copper wire and facilitate the subsequent polishing operation. The copper wire body 8 is in contact with the lower polishing roller 72.

[0030] The stabilizing assembly 74 includes an electric push rod 741, which is fixedly connected to the upper inner wall of the fixing frame 4. The lower end of the electric push rod 741 is fixedly connected to a lifting plate 742. The lower side of the lifting plate 742 is fixedly connected to two bottom plates 743. A rotating rod 744 is rotatably connected between the two bottom plates 743. The outer side of the rotating rod 744 is fixedly connected to the upper polishing roller 745. The front side of the bottom plate 743 is fixedly connected to a motor 7435 that drives the rotating rod 744 to rotate. The left and right sides of the bottom plate 743 are fixed. A connecting plate 746 is fixedly connected, and a side plate 747 is fixedly connected to the outer side of the connecting plate 746. When polishing the copper wire body 8, the electric push rod 741 is controlled to drive the lifting plate 742 to descend, and the lifting plate 742 drives the upper polishing roller 745 on the bottom plate 743 to descend, and the motor 7435 is started. The motor 7435 drives the rotating rod 744 to rotate, and the rotating rod 744 drives the upper polishing roller 745 to rotate, so that the upper polishing roller 745 rotates, making it convenient for the upper polishing roller 745 to polish the copper wire body 8.

[0031] The front and rear sides of the side plates 747 are fixedly connected to L-shaped plates 748. The outer sides of the L-shaped plates 748 on both sides are provided with moving rods 7413. The end of the moving rod 7413 close to the copper wire body 8 passes through the outer side of the L-shaped plate 748 and is fixedly connected to the moving plate 7414. The upper and lower sides of the moving plate 7414 are fixedly connected to mounting blocks 7415. A plurality of stabilizing rollers 7416 are rotatably connected between the upper and lower mounting blocks 7415. The other end of the moving rod 7413 is fixedly connected to the control plate 7417. The outer sides of the control plates 7417 on both sides are fixedly connected to rotating block 1 7418. The outer sides of the two rotating blocks 1 7418 are rotatably connected to inclined plate 1 7419. The outer side of the inclined plate 1 7419 is rotatably connected to rotating block 2 7426. The side of rotating block 2 7426 away from the connecting plate 746 is fixedly connected to control block 1 7425. The upper side of the control block 1 7425 is fixedly connected to rotating block 3 7427. The outer side of block three 7427 is rotatably connected to inclined plate two 7428, and the outer side of inclined plate two 7428 is rotatably connected to rotating block four 7429. The outer side of rotating block four 7429 is fixedly connected to moving block one 7430. The lower side of moving block one 7430 is fixedly connected to lifting rod 7431. The lower end of lifting rod 7431 passes through the lower side of side plate 747 and is fixedly connected to moving block two 7432. The fixed plates 73 on both sides are fixed near the side of moving block two 7432. A contact plate 7433 is fixedly connected to the outer side of the contact plate 7433, an electromagnet 7434 is fixedly connected to the upper side of the side plate 747, a slide groove 7423 is provided on the upper side of the side plate 747, a slider 7424 is slidably connected to the inner side of the slide groove 7423, the slider 7424 is fixedly connected to the control block 1 7425, a top block 7420 is fixedly connected to the upper side of the side plate 747, and a telescopic rod 7421 and a spring 7422 are fixedly connected between the top block 7420 and the control block 1 7425.

[0032] Before polishing the copper wire body 8, the bottom plate 743 drives the connecting plate 746 to descend, the connecting plate 746 drives the side plate 747 to descend, the side plate 747 drives the stabilizing roller 7416 to descend, and at the same time, the side plate 747 drives the moving block 2 7432 to descend. When the moving block 2 7432 contacts the contact plate 7433, the contact plate 7433 is located below the moving block 2 7432, and the side plate 747 is continued to be controlled to descend, so that the moving block 2 7432 rises relative to the side plate 747. The moving block 2 7432 drives the lifting rod 7431 to rise, the lifting rod 7431 drives the moving block 1 7430 to move, the moving block 1 7430 drives the inclined plate 2 7428 to rotate, the inclined plate 2 7428 drives the control block 1 7425 to move away from the connecting plate 746, and the control block 1 7425 The inclined plate 1 7419 is driven to rotate. Since the two inclined plates 1 7419 are symmetrically distributed, the inclined plate 1 7419 drives the control plate 7417 to move. The control plates 7417 on the front and rear sides approach each other. The control plate 7417 drives the moving rod 7413 to move. The moving rod 7413 drives the moving plate 7414 to move. The moving plate 7414 drives the stabilizing roller 7416 to move. The stabilizing rollers 7416 on the front and rear sides approach the copper wire body 8, which is convenient for limiting the copper wire body 8 in the polishing area, increasing the stability of the copper wire body 8 during polishing, and avoiding vibration and noise of the copper wire body 8. At the same time, the electromagnet 7434 is energized. The moving block 2 7432 is made of metal material, so that the electromagnet 7434 adsorbs the moving block 2 7432, so that the stabilizing roller 7416 is limited.

[0033] A fixed tube 749 is fixedly connected between the two L-shaped plates 748 on the same side, an absorption head 7410 is fixedly connected to the lower side of the fixed tube 749, a connecting tube 7411 is fixedly connected between the two fixed tubes 749, a vacuum cleaner 5 is fixedly connected to the upper side of the fixed frame 4, and a conveying tube 7412 is fixedly connected between the vacuum cleaner 5 and the connecting tube 7411. When polishing, more debris will be generated. At this time, the vacuum cleaner 5 is started. Under the action of the conveying tube 7412, the connecting tube 7411 and the fixed tube 749, multiple absorption heads 7410 absorb the dust to keep the working environment clean.

[0034] Furthermore, a closing assembly 75 is provided on the outer side of the second fixing plate 73. The closing assembly 75 includes a storage groove 751. The storage groove 751 is provided on the lower side of the second fixing plate 73. A closing plate 752 is provided on the inner side of the storage groove 751. The outer sides of the closing plate 752 and the first fixing plate 9 are both provided with an arc groove 756. A lifting groove 753 is provided on the side of the second fixing plate 73 close to the lifting plate 742. A lifting block 754 is slidably connected to the inner side of the lifting groove 753. The lifting block 754 is fixedly connected to the closing plate 752. Then, a control block 2 755 is fixedly connected between the lifting plate 742 and the closing plate 752. An observation window 6 is provided on the front side of the fixed frame 4. Through the observation window 6, the polishing condition of the internal copper wire body 8 can be conveniently observed. Before polishing, the lifting plate 742 drives the control block 2 755 to descend, the control block 2 755 drives the lifting block 754 to descend, and the lifting block 754 drives the closing plate 752 to descend, so that the closing plate 752 blocks the debris and noise generated during polishing, thereby reducing the impact on the staff.

[0035] Working principle: When in use, the copper wire body 8 is installed on the take-up roller 2 and the pay-off roller 3, the copper wire body 8 is in contact with the lower polishing roller 72, the electric push rod 741 is controlled to drive the upper polishing roller 745 to descend, and the motor 7435 is started to drive the upper polishing roller 745 to rotate, so as to facilitate the polishing of the copper wire body 8.

[0036] Before polishing, the lifting plate 742 is controlled to drive the bottom plate 743 to descend, the bottom plate 743 drives the second moving block 7432 to descend, the second moving block 7432 rises relative to the side plate 747, the second moving block 7432 drives the lifting rod 7431 to rise, the lifting rod 7431 drives the first moving block 7430 to rise, under the action of the second inclined plate 7428, the control block 1 7425 moves, the control block 1 7425 drives the inclined plate 1 7419 to rotate, and under the action of the control plate 7417 and the moving rod 7413, the stable rollers on the front and rear sides are controlled. 7416 moves toward the copper wire body 8, making it convenient for the stabilizing roller 7416 to limit the copper wire body 8, thereby increasing the stability of the polishing area of ​​the copper wire body 8. At the same time, the lifting plate 742 drives the control block 2 755 to descend, and the control block 2 755 drives the closing plate 752 on the lifting block 754 to descend, making it convenient for the closing plate 752 to block debris and noise. During polishing, the vacuum cleaner 5 is started, and under the action of the conveying pipe 7412, the connecting pipe 7411 and the fixed pipe 749, the absorption head 7410 absorbs the dust.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tinned copper wire polishing mechanism, comprising a mounting plate (1) and a copper wire body (8), characterized in that: A take-up roller (2) and a pay-off roller (3) are provided on the upper side of the mounting plate (1); a fixing frame (4) is fixedly connected to the upper side of the mounting plate (1) and located between the take-up roller (2) and the pay-off roller (3); a fixing plate 1 (9) is fixedly connected to the left and right sides of the fixing frame (4); a stabilizing unit (7) is provided on the inner side of the fixing frame (4); the stabilizing unit (7) includes a fixing plate 2 (73); the fixing plate 2 (73) is fixedly connected to the left and right sides of the fixing frame (4); two bottom blocks (71) are fixedly connected to the upper side of the mounting plate (1); a lower polishing roller (72) is provided between the two bottom blocks (71); a stabilizing component (74) is provided on the inner wall of the fixing frame (4); the stabilizing component (74) is used to stabilize the copper wire body (8) in the polishing area; The stabilizing assembly (74) includes an electric push rod (741), the electric push rod (741) is fixedly connected to the upper inner wall of the fixing frame (4), the lower end of the electric push rod (741) is fixedly connected to a lifting plate (742), the lower side of the lifting plate (742) is fixedly connected to two bottom plates (743), a rotating rod (744) is rotatably connected between the two bottom plates (743), the outer side of the rotating rod (744) is fixedly connected to an upper polishing roller (745), the front side of the bottom plate (743) is fixedly connected to a motor (7435) for driving the rotating rod (744) to rotate, the left and right sides of the bottom plate (743) are fixedly connected to connecting plates (746), and the outer side of the connecting plate (746) is fixedly connected to a side plate (747); The front and rear sides of the side plates (747) on both sides are fixedly connected to L-shaped plates (748), and the outer sides of the L-shaped plates (748) on both sides are provided with moving rods (7413). The end of the moving rod (7413) close to the copper wire body (8) passes through the outer side of the L-shaped plate (748) and is fixedly connected to the moving plate (7414). The upper and lower sides of the moving plate (7414) are fixedly connected to mounting blocks (7415), and a plurality of stabilizing rollers (7416) are rotatably connected between the mounting blocks (7415) on the upper and lower sides. The other end of the moving rod (7413) is fixedly connected to a control plate (7417), and the outer sides of the control plates (7417) on both sides are fixedly connected to a rotating block 1 (7418), and the outer sides of the two rotating blocks 1 (7418) are rotatably connected to an inclined plate 1 (7419), and the outer side of the inclined plate 1 (7419) is rotatably connected to a rotating block 2 (7426), and the side of the rotating block 2 (7426) away from the connecting plate (746) is fixedly connected to a control block 1 (7425), and the upper side of the control block 1 (7425) is fixedly connected to a rotating block 3 (7427), and the outer side of the rotating block 3 (7427) is rotatably connected to Inclined plate 2 (7428), the outer side of the inclined plate 2 (7428) is rotatably connected to rotating block 4 (7429), the outer side of the rotating block 4 (7429) is fixedly connected to moving block 1 (7430), the lower side of the moving block 1 (7430) is fixedly connected to a lifting rod (7431), the lower end of the lifting rod (7431) passes through the lower side of the side plate (747) and is fixedly connected to moving block 2 (7432), and the side of the fixed plate 2 (73) on both sides close to the moving block 2 (7432) is fixedly connected to a contact plate (7433), and the outer side of the contact plate (7433) is fixedly connected to an electromagnet (7434).

2. The tinned copper wire polishing mechanism according to claim 1, characterized in that: A sliding groove (7423) is provided on the upper side of the side plate (747), a slider (7424) is slidably connected to the inner side of the sliding groove (7423), the slider (7424) is fixedly connected to the control block 1 (7425), a top block (7420) is fixedly connected to the upper side of the side plate (747), and a telescopic rod (7421) and a spring (7422) are fixedly connected between the top block (7420) and the control block 1 (7425).

3. The tinned copper wire polishing mechanism according to claim 2, characterized in that: A fixed pipe (749) is fixedly connected between the two L-shaped plates (748) on the same side, an absorption head (7410) is fixedly connected to the lower side of the fixed pipe (749), a connecting pipe (7411) is fixedly connected between the two fixed pipes (749), a dust collector (5) is fixedly connected to the upper side of the fixed frame (4), and a delivery pipe (7412) is fixedly connected between the dust collector (5) and the connecting pipe (7411).

4. The tinned copper wire polishing mechanism according to claim 3, characterized in that: A closing component (75) is provided on the outer side of the second fixed plate (73), and the closing component (75) includes a storage groove (751). The storage groove (751) is opened on the lower side of the second fixed plate (73), and a closing plate (752) is provided on the inner side of the storage groove (751). The outer sides of the closing plate (752) and the first fixed plate (9) are both provided with an arc groove (756). A lifting groove (753) is provided on the side of the second fixed plate (73) close to the lifting plate (742). A lifting block (754) is slidably connected to the inner side of the lifting groove (753). The lifting block (754) is fixedly connected to the closing plate (752). A control block (755) is fixedly connected between the lifting plate (742) and the closing plate (752). An observation window (6) is provided on the front side of the fixed frame (4).

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