A kind of glass magnesium fireproof plate edge grinding device

Abstract

The application discloses a glass-magnesium fireproof plate edge grinding device and relates to the technical field of glass-magnesium fireproof plate production equipment. The glass-magnesium fireproof plate edge grinding device comprises a workbench, a pair of grinding assemblies symmetrically arranged on the upper surface of the workbench, a displacement assembly arranged between the two grinding assemblies, a positioning assembly arranged on the displacement assembly, and a pair of pusher assemblies symmetrically arranged on the positioning assembly. The positioning assembly is used for clamping and positioning the fireproof plate. The displacement assembly is used for driving the linear movement of the fireproof plate. The grinding assembly is used for grinding the edge to be ground of the fireproof plate once. The pusher assembly is used for pushing the burrs of the edge to be ground of the fireproof plate to the positions corresponding to the grinding assembly. The displacement assembly is used for driving the linear movement of the fireproof plate again. The grinding assembly is used for grinding the edge to be ground of the fireproof plate twice. The edge grinding effect of the fireproof plate is effectively improved, and the glass-magnesium fireproof plate edge grinding device is suitable for wide application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of glass magnesium fireproof plate production equipment, and particularly relates to an edge grinding device for glass magnesium fireproof plate. BACKGROUND

[0002] A glass magnesium fireproof plate edge grinding device is disclosed in Chinese Patent No. CN210060669U. The device adjusts the distance between the first clamping plate and the second clamping plate by pulling the pull rod first, then places the fireproof plate on the moving frame, with the edge to be ground of the fireproof plate placed against the limiting wheel, loosens the pull rod after the position is set, clamps the fireproof plate, starts the motor, and rotates the polishing wheel to work. The moving frame is pushed along the slide rail by the pushing mechanism during movement, and the polishing wheel grinds the edges of the fireproof plate on both sides to complete the grinding work. The above-mentioned device has the following disadvantages: since the working surface of the polishing wheel is parallel to the surface to be ground of the fireproof plate, although it can achieve the grinding operation on the surface to be ground of the fireproof plate, burrs on the upper and lower edges of the surface to be ground of the fireproof plate may be in a vertical state or the burr tips may point to the middle of the fireproof plate during grinding, so they cannot be ground off. Even if the grinding thickness of the surface to be ground of the fireproof plate is increased, new burrs may still appear on the upper and lower edges of the surface to be ground of the fireproof plate during grinding, resulting in poor grinding effect and other problems. Therefore, there is an urgent need to research an edge grinding device for glass magnesium fireproof plate to solve the above-mentioned problems. SUMMARY

[0003] The application aims to provide an edge grinding device for glass magnesium fireproof plate to solve the technical problems proposed in the background.

[0004] To solve the above-mentioned technical problems, the application is implemented by the following technical scheme:

[0005] The application is an edge grinding device for glass magnesium fireproof plate, which comprises a workbench. A pair of polishing assemblies is symmetrically installed on the upper surface of the workbench. A displacement assembly for driving the linear motion of the fireproof plate is installed between the two polishing assemblies. A positioning assembly for clamping the fireproof plate is installed on the displacement assembly. A pair of push flat assemblies for pushing the burrs of the edge to be ground of the fireproof plate to the corresponding positions of the polishing assemblies is symmetrically installed on the positioning assembly.

[0006] As a preferred technical scheme of the present application, the polishing assembly comprises a support column vertically fixed to the upper surface of the workbench; the upper end of the support column is horizontally fixed with an electric push rod; the output end of the electric push rod is fixed with an L-shaped plate; the horizontal section of the L-shaped plate is vertically fixed with a first servo motor; the output shaft of the first servo motor extends through the L-shaped plate and is horizontally fixed with a movable plate; the lower surface of the movable plate is horizontally fixed with a double-shaft motor; one output shaft of the double-shaft motor is fixed with a grinding disc; the other output shaft of the double-shaft motor is fixed with a brush disc.

[0007] As a preferred technical scheme of the present application, the shifting assembly comprises a pair of support blocks fixed to the opposite sides of the workbench; the two support blocks are connected through a transmission screw rod and a guide rod arranged side by side; one end of the transmission screw rod is coaxially fixed to the output shaft of a second servo motor; the second servo motor is fixed to one support block; a pair of transmission nuts are arranged side by side on the transmission screw rod; a pair of guide sleeves corresponding to the transmission nuts are slidably arranged on the guide rod; the two guide sleeves and the two transmission nuts are connected through a bearing block for carrying the positioning assembly.

[0008] As a preferred technical scheme of the present application, the positioning assembly comprises a first bidirectional screw rod rotatably connected at both ends to the two bearing blocks; one end of the first bidirectional screw rod is coaxially fixed to the output shaft of a third servo motor; the third servo motor is fixed to one bearing block; first nuts are arranged on the two threaded sections of the first bidirectional screw rod; the first nuts are fixedly inserted into the lower parts of first T-shaped blocks; a pair of second T-shaped blocks are symmetrically arranged between the two first T-shaped blocks; limiting sleeves are fixedly inserted into the lower parts of the second T-shaped blocks; the limiting sleeves are slidably arranged on the first bidirectional screw rod; the second T-shaped blocks and the first T-shaped blocks are connected through a pair of first springs arranged side by side; the two second T-shaped blocks form a clamping space for the fireproof plate; an active column parallel to the first bidirectional screw rod is arranged between the two first springs; one end of the active column is fixed to the second T-shaped block; the other end of the active column is slidably inserted into a support cylinder; the support cylinder is slidably inserted into the first T-shaped block; one end of the support cylinder is fixed to the bearing block.

[0009] As a preferred technical scheme of the present application, the pushing assembly comprises a pair of horizontally distributed upper and lower bearing strips; both ends of the bearing strips are rotatably connected with transmission rods corresponding to the first T-shaped blocks; one end of the transmission rod is rotatably connected to the first T-shaped block; a pair of upper and lower movable strips are arranged in parallel between the two bearing strips; the opposite inner sides of the two movable strips are both fixedly provided with pushing strips in parallel; the two pushing strips form a containing space for the fireproof plate; the two movable strips are connected through a linear driving element; the linear driving element is used to drive the two movable strips to move synchronously.

[0010] As a preferred technical scheme of the present application, the linear driving element comprises a pair of positioning rods respectively slidingly inserted into the two ends of the movable strip; the positioning rods are arranged perpendicularly to the movable strip; both ends of the positioning rod are fixedly connected to the two bearing strips; the opposite outer sides of the two positioning rods are both provided with second bidirectional screws in parallel; both ends of the second bidirectional screw are rotatably connected to the two bearing strips; second nuts are respectively sleeved on the two threaded segments of the second bidirectional screw; the second nuts are fixedly inserted into a lifting block; a sliding sleeve is fixedly inserted into the lifting block; the sliding sleeve is slidingly sleeved on the positioning rod; the sliding sleeve and the movable strip are connected through a second spring; the second spring is sleeved on the positioning rod; the bearing strip and the movable strip are connected through a plurality of third springs arranged side by side; one end of each of the two second bidirectional screws is fixedly provided with a first pulley; a second pulley is arranged between the two first pulleys; one end of the shaft of the second pulley is rotatably connected to one of the bearing strips; the second pulley and the two first pulleys are drivingly connected through a belt; the other end of the shaft of the second pulley is fixedly provided with a hand wheel.

[0011] The present application has the following beneficial effects:

[0012] The present application can effectively remove the burrs at the edge to be ground of the fireproof plate, effectively improve the edge grinding effect of the fireproof plate, and has high market application value.

[0013] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0015] Figure 1 It is a structural schematic view of the edge grinding device of the glass-magnesium fireproof plate.

[0016] Figure 2 It is a structural schematic view of the polishing assembly.

[0017] Figure 3 It is a structural schematic view of the shifting assembly.

[0018] Figure 4 It is a structural schematic view of the connection between the positioning assembly and the pushing assembly.

[0019] Figure 5 It is a structural schematic view of the positioning assembly.

[0020] Figure 6 It is a structural front view of Figure 5 .

[0021] Figure 7 It is a structural top view of Figure 5 .

[0022] Figure 8 It is a structural schematic view of the pushing assembly.

[0023] Figure 9 It is a structural front view of Figure 8 .

[0024] Figure 10 It is an enlarged structural schematic view of A in Figure 9 .

[0025] In the drawings, the component list represented by each reference sign is as follows:

[0026] 1-workbench, 2-polishing assembly, 3-shifting assembly, 4-positioning assembly, 5-flattening assembly, 201-support column, 202-electric push rod, 203-L-shaped plate, 204-first servo motor, 205-moving plate, 206-double-shaft motor, 207-grinding disc, 208-brush disc, 301-supporting block, 302-transmission screw rod, 303-guide rod, 304-second servo motor, 305-transmission nut, 306-guide sleeve, 307-bearing block, 401-first bidirectional screw rod, 402-third servo motor, 403-first nut, 404-first T-shaped block, 405-second T-shaped block, 406-limiting sleeve, 407-first spring, 408-moving column, 409-supporting cylinder, 501-bearing plate strip, 502-transmission rod, 503-moving plate strip, 504-positioning rod, 505-second bidirectional screw rod, 506-lifting block, 507-second spring, 508-third spring, 509-first pulley, 5031-flattening strip, 5051-second nut, 5061-sliding sleeve, 5091-second pulley, 5092-hand wheel. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Embodiment one:

[0029] Please refer to Figure 1 As shown in the drawings, the present application is a kind of glass magnesium fireproof plate edge grinding device, including the conventional workbench 1 in the art;The upper surface of the workbench 1 is symmetrically provided with a pair of polishing assembly 2;Two polishing assembly 2 between the installation has a shifting assembly 3 for driving the linear motion of fireproof plate;The positioning assembly 4 for clamping the fireproof plate is installed on the shifting assembly 3;A pair of flattening assembly 5 for pushing the burr of the fireproof plate to be ground to the corresponding position of the polishing assembly 2 is symmetrically installed on the positioning assembly 4.

[0030] Among them, as Figure 2As shown, the polishing assembly 2 comprises a support column 201 vertically fixed on the upper surface of the workbench 1; the upper end of the support column 201 is horizontally fixed with a conventional electric push rod 202 in the art; the output end of the electric push rod 202 points to the shifting assembly 3; the output end of the electric push rod 202 is fixed with an L-shaped plate 203; the horizontal section of the L-shaped plate 203 is vertically fixed with a first servo motor 204; the output shaft of the first servo motor 204 extends through the horizontal section of the L-shaped plate 203 to below and is horizontally fixed with a movable plate 205; the output shaft of the first servo motor 204 is in clearance fit with the horizontal section of the L-shaped plate 203; the lower surface of the movable plate 205 is horizontally fixed with a conventional double-shaft motor 206 in the art; one output shaft of the double-shaft motor 206 is fixed with a conventional grinding disc 207 in the art; the other output shaft of the double-shaft motor 206 is fixed with a conventional brush disc 208; the brush disc 208 is composed of a disc body and a plurality of bristles evenly connected to one surface of the disc body. When it is needed to polish the fireproof plate by using the grinding disc 207, the double-shaft motor 206 is rotated by the first servo motor 204 through the movable plate 205, so as to make the output shaft of the double-shaft motor 206 axially parallel to the extension direction of the output end of the electric push rod 202, and at the same time, the grinding disc 207 is located at the side of the double-shaft motor 206 away from the support column 201, then the grinding disc 207 is brought close to the fireproof plate by using the electric push rod 202, and the grinding disc 207 is rotated by using the double-shaft motor 206 to realize the polishing of the fireproof plate; when it is needed to clean the fireproof plate by using the brush disc 208, the double-shaft motor 206 is rotated by the first servo motor 204 through the movable plate 205, so as to make the output shaft of the double-shaft motor 206 axially parallel to the extension direction of the output end of the electric push rod 202, and at the same time, the brush disc 208 is located at the side of the double-shaft motor 206 away from the support column 201, then the brush disc 208 is brought close to the fireproof plate by using the electric push rod 202, and the brush disc 208 is rotated by using the double-shaft motor 206 to realize the cleaning of the fireproof plate.

[0031] wherein as Figure 3As shown, the shifting assembly 3 comprises a pair of support blocks 301 fixed on opposite sides of the workbench 1 respectively; the two support blocks 301 are connected through a driving screw rod 302 and a guide rod 303 arranged side by side; the axial direction of the driving screw rod 302 is perpendicular to the telescopic direction of the output end of the electric push rod 202; the two ends of the driving screw rod 302 are rotatably connected with the two support blocks 301 respectively; the two ends of the guide rod 303 are fixedly connected with the two support blocks 301 respectively; one end of the driving screw rod 302 is coaxially fixed on the output shaft of a second servo motor 304; the second servo motor 304 is fixed on one of the support blocks 301; a pair of driving nuts 305 are arranged side by side on the driving screw rod 302; a pair of guide sleeves 306 corresponding to the driving nuts 305 are slidably arranged on the guide rod 303; the two guide sleeves 306 and the two driving nuts 305 are connected through a bearing block 307 for carrying the positioning assembly 4 respectively; the guide sleeves 306 and the driving nuts 305 are fixedly inserted into the bearing block 307. In use, the second servo motor 304 drives the driving screw rod 302 to rotate, which causes the driving nuts 305 to move linearly with the bearing block 307, so as to realize the linear movement of the positioning assembly 4 with the fireproof plate. Specific embodiment two:

[0033] On the basis of the specific embodiment one, as shown in Figures 4-7 The positioning assembly 4 comprises a first bidirectional screw rod 401 rotatably connected at both ends to the two bearing blocks 307; one end of the first bidirectional screw rod 401 is coaxially fixed on the output shaft of a third servo motor 402; the third servo motor 402 is fixed on one of the bearing blocks 307; a first nut 403 is arranged on each of the two threaded segments of the first bidirectional screw rod 401; the first nut 403 is fixedly inserted into the lower part of a first T-shaped block 404; a pair of second T-shaped blocks 405 are symmetrically arranged between the two first T-shaped blocks 404; a limiting sleeve 406 is fixedly inserted into the lower part of the second T-shaped block 405; the limiting sleeve 406 is slidably arranged on the first bidirectional screw rod 401; the second T-shaped block 405 and the first T-shaped block 404 are connected through a pair of first springs 407 arranged side by side; the two second T-shaped blocks 405 form a clamping space for the fireproof plate. In use, the fireproof plate is placed horizontally between the two second T-shaped blocks 405, and then the third servo motor 402 drives the first bidirectional screw rod 401 to rotate, which causes the two second T-shaped blocks 405 to move relatively under the elastic force of the first springs 407, so as to realize the clamping and positioning of the fireproof plate.

[0034] Among them, as Figures 5-7As shown, the two first springs 407 are provided with a movable column 408 parallel to the first bidirectional screw rod 401; one end of the movable column 408 is fixed on the second T-shaped block 405; the other end of the movable column 408 is slidingly inserted into a supporting cylinder 409; the supporting cylinder 409 is slidingly inserted into the upper portion of the first T-shaped block 404; one end of the supporting cylinder 409 is fixed on the bearing block 307. Specific embodiment three:

[0036] On the basis of the specific embodiment two, as Figure 4 and Figures 8-10As shown, the flattening assembly 5 comprises a pair of horizontally distributed upper and lower bearing strips 501; the two ends of the bearing strips 501 are rotatably connected with the transmission rods 502 corresponding to the first T-shaped blocks 404; one end of the transmission rod 502 is rotatably connected to the first T-shaped block 404; a pair of upper and lower movable strips 503 are arranged in parallel between the two bearing strips 501; the opposite inner sides of the two movable strips 503 are both fixedly provided with the flattening strips 5031 in parallel; the flattening strips 5031 are conventional elastic rubber strips in the art; the space for accommodating the fireproof plate is formed between the two flattening strips 5031; the two movable strips 503 are connected through the linear drive; the linear drive is used to drive the two movable strips 503 to move synchronously; the linear drive comprises a pair of positioning rods 504 which are respectively slidably inserted into the two ends of the movable strips 503; the positioning rods 504 are vertically arranged, and the positioning rods 504 are arranged perpendicularly to the movable strips 503; the two ends of the positioning rods 504 are fixedly connected to the two bearing strips 501; the opposite outer sides of the two positioning rods 504 are both provided with the second bidirectional screw rods 505 in parallel; the two ends of the second bidirectional screw rods 505 are rotatably connected to the two bearing strips 501; the two threaded segments of the second bidirectional screw rods 505 are respectively sleeved with the second nuts 5051; the second nuts 5051 are fixedly inserted into the lifting blocks 506; the lifting blocks 506 are fixedly inserted with the sliding sleeves 5061; the sliding sleeves 5061 are slidably sleeved on the positioning rods 504; the sliding sleeves 5061 and the movable strips 503 are connected through the second springs 507; the second springs 507 are sleeved on the positioning rods 504; the bearing strips 501 and the movable strips 503 are connected through a plurality of third springs 508 arranged side by side. In use, by inserting the fireproof plate between the two flattening strips 5031, when the positioning assembly 4 completes the clamping and positioning of the fireproof plate, the linear drive is used to drive the two movable strips 503 to move synchronously, so as to make the two flattening strips 5031 abut against the upper and lower surfaces of the fireproof plate, thereby further improving the clamping and positioning effect of the fireproof plate; after the fireproof plate is processed once, the two second T-shaped blocks 405 are driven to move by the third servo motor 402; since the second T-shaped blocks 405 and the first T-shaped blocks 404 are connected through the first springs 407, the first springs 407 are further compressed, at the same time, the bearing strips 501 are driven by the first T-shaped blocks 404 and the transmission rods 502 to move close to the edge to be ground of the fireproof plate, so as to make the flattening strips 5031 push the burrs on the upper and lower edges of the surface of the edge to be ground of the fireproof plate to the positions corresponding to the polishing assembly 2, and then the fireproof plate is polished again, thereby effectively improving the polishing effect of the fireproof plate.

[0037] wherein as Figure 4 and Figure 8As shown, one end of the two second bidirectional screw rods 505 is fixed with a first pulley 509; the two first pulleys 509 are provided with a second pulley 5091; one end of the wheel shaft of the second pulley 5091 is rotatably connected to a bearing plate strip 501; the second pulley 5091 and the two first pulleys 509 are connected through a belt transmission; the other end of the wheel shaft of the second pulley 5091 is fixed with a conventional hand wheel 5092 in the art. In use, the two second bidirectional screw rods 505 are driven to rotate synchronously through the hand wheel 5092, the second pulley 5091 and the first pulley 509, so that the adjusting efficiency of the pusher 5031 can be effectively improved.

[0038] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A glass magnesium fireproof plate edge grinding device, comprising a workbench (1); characterized in that: a pair of grinding assemblies (2) are symmetrically arranged on the upper surface of the workbench (1); a displacement assembly (3) for driving the linear motion of the fireproof plate is arranged between the two grinding assemblies (2); a positioning assembly (4) for clamping the fireproof plate is arranged on the displacement assembly (3); a pair of flattening assemblies (5) for pushing the edge burr of the fireproof plate to be ground to the corresponding position of the grinding assembly (2) are symmetrically arranged on the positioning assembly (4); the displacement assembly (3) comprises a pair of support blocks (301) fixed to the opposite sides of the workbench (1); the two support blocks (301) are connected through a transmission screw rod (302) and a guide rod (303) arranged side by side; one end of the transmission screw rod (302) is coaxially fixed to the output shaft of a second servo motor (304); the second servo motor (304) is fixed to a support block (301); a pair of transmission nuts (305) are arranged side by side on the transmission screw rod (302); a pair of guide sleeves (306) corresponding to the transmission nuts (305) are slidably arranged on the guide rod (303); the two guide sleeves (306) and the two transmission nuts (305) are connected through a bearing block (307) for carrying the positioning assembly (4); the positioning assembly (4) comprises a first bidirectional screw rod (401) rotatably connected to the two bearing blocks (307) at both ends; one end of the first bidirectional screw rod (401) is coaxially fixed to the output shaft of a third servo motor (402); the third servo motor (402) is fixed to a bearing block (307); first nuts (403) are arranged on the two threaded sections of the first bidirectional screw rod (401), respectively; the first nuts (403) are fixedly inserted into the lower part of a first T-shaped block (404); a pair of second T-shaped blocks (405) are symmetrically arranged between the two first T-shaped blocks (404); a limiting sleeve (406) is fixedly inserted into the lower part of the second T-shaped block (405); the limiting sleeve (406) is slidably arranged on the first bidirectional screw rod (401); the second T-shaped block (405) and the first T-shaped block (404) are connected through a pair of first springs (407) arranged side by side; a clamping space for the fireproof plate is formed between the two second T-shaped blocks (405). The pushing assembly (5) comprises a pair of horizontally distributed upper and lower bearing strips (501); both ends of the bearing strip (501) are rotatably connected with the transmission rod (502) corresponding to the first T-shaped block (404); one end of the transmission rod (502) is rotatably connected to the first T-shaped block (404); a pair of upper and lower movable strips (503) are arranged in parallel between the two bearing strips (501); the opposite inner sides of the two movable strips (503) are fixedly provided with pushing strips (5031) in parallel; the two pushing strips (5031) form a containing space for the fireproof plate; the two movable strips (503) are connected through a linear drive; the linear drive is used to drive the two movable strips (503) to move synchronously; the linear drive comprises a pair of positioning rods (504) slidingly inserted into the two ends of the movable strip (503); the positioning rod (504) is arranged perpendicularly to the movable strip (503); both ends of the positioning rod (504) are fixed to the two bearing strips (501); the opposite outer sides of the two positioning rods (504) are provided with second bidirectional screws (505) in parallel; both ends of the second bidirectional screw (505) are rotatably connected to the two bearing strips (501); the two threaded sections of the second bidirectional screw (505) are respectively sleeved with second nuts (5051); the second nut (5051) is fixedly inserted into a lifting block (506); the lifting block (506) is fixedly inserted with a sliding sleeve (5061); the sliding sleeve (5061) is slidingly sleeved on the positioning rod (504); the sliding sleeve (5061) and the movable strip (503) are connected through a second spring (507); the second spring (507) is sleeved on the positioning rod (504).

2. A device for edging glass-magnesite fireproof plate according to claim 1, characterized in that, The polishing assembly (2) comprises a support column (201) vertically fixed to the upper surface of the workbench (1); the upper end of the support column (201) is fixedly provided with an electric push rod (202); the output end of the electric push rod (202) is fixedly provided with an L-shaped plate (203); the horizontal section of the L-shaped plate (203) is vertically fixedly provided with a first servo motor (204); the output shaft of the first servo motor (204) extends downwardly through the horizontal section of the L-shaped plate (203) and is fixedly provided with a movable plate (205); the lower surface of the movable plate (205) is fixedly provided with a double-shaft motor (206); one output shaft of the double-shaft motor (206) is fixedly provided with a grinding disc (207); the other output shaft of the double-shaft motor (206) is fixedly provided with a brush disc (208).

3. The device for edging glass-magnesite fireproof plate according to claim 1, characterized in that, A movable column (408) parallel to the first bidirectional screw (401) is arranged between the two first springs (407); one end of the movable column (408) is fixed to the second T-shaped block (405); the other end of the movable column (408) is slidingly inserted into a support cylinder (409); the support cylinder (409) is slidingly inserted into the first T-shaped block (404); one end of the support cylinder (409) is fixed to the bearing block (307).

4. The device for edging glass-magnesite fireproof plate according to claim 1, characterized in that, The bearing batten (501) and the movable batten (503) are connected through a plurality of third springs (508) arranged side by side.

5. A device for edging glass-magnesite fireproof plate according to claim 4, characterized in that, One end of each of the two second bidirectional lead screws (505) is fixedly provided with a first pulley (509); a second pulley (5091) is arranged between the two first pulleys (509); one end of a wheel shaft of the second pulley (5091) is rotatably connected to a bearing batten (501); the second pulley (5091) and the two first pulleys (509) are connected through belt transmission; the other end of the wheel shaft of the second pulley (5091) is fixedly provided with a hand wheel (5092).

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