Circular knitting machine with adjustable yarn supply mechanism

Abstract

The utility model belongs to the technical field of circular knitting machines, and discloses a circular knitting machine with an adjustable yarn supply mechanism. The device comprises a rack, a circular truncated cone is arranged on the rack, a top table is arranged on the circular truncated cone, a dust blocking assembly is arranged on the top table, a support is fixedly connected to the inner side wall of the top table, a fan is fixedly mounted on the support, three mounting grooves are formed in the top table and distributed in an annular array, and a power assembly is arranged on the top table. A lifting assembly is arranged on the power assembly, a connecting assembly is arranged on the outer surface of the top table, an air guide table is fixedly connected to the lower side of the top table, and a fixed sliding seat is fixedly connected to the upper side of the top table. And dust blocking meshes of the dust blocking net are prevented from being blocked, the air outlet effect is improved, and then the dust removal effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circular knitting machines, in particular to a circular knitting machine with an adjustable yarn supply mechanism. Background Art

[0002] A circular knitting machine is a textile machine, which generally includes a yarn feeding mechanism, a weaving mechanism, a pulling and winding mechanism, a transmission mechanism and an electrical control system. The yarn passes through the yarn feeding mechanism and enters the weaving mechanism. The weaving mechanism is driven by the transmission mechanism to weave the yarn. The woven fabric can be wound up by the pulling and winding mechanism, and the electrical control system can be used to realize the electrical control of the device.

[0003] A Chinese utility model patent with publication number CN116463781A discloses a circular knitting machine with an adjustable yarn supply mechanism, including a frame and a yarn supply mechanism, a weaving mechanism, a pulling and winding mechanism, a transmission mechanism and an electrical control system arranged on the frame. The yarn supply mechanism includes a linear motion module, an arc-shaped yarn frame and a traction arm. The frame is fixedly connected with a linear motion module, which can reduce the height of the yarn storage device and the yarn feeding nozzle, thereby facilitating the arrangement of the yarn, thereby improving the production efficiency.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: 1. The disclosed patent can only lower the height of the yarn storage device and the yarn feeding nozzle, but it is not convenient to adjust the use height of the entire yarn feeding mechanism according to actual usage, which is inconvenient to use; 2. The disclosed patent can prevent dust from falling on the yarn through the dust removal mechanism, but after long-term use, dust is easy to accumulate on the dust removal box, causing the air inlet on the dust removal box to be blocked, affecting the air outlet effect of the dust removal mechanism and the dust removal effect. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a circular knitting machine with an adjustable yarn supply mechanism.

[0006] The above-mentioned technical purpose of the utility model is achieved through the following technical solutions: a large circular knitting machine with an adjustable yarn supply mechanism, comprising a frame, a round table is provided on the frame, a top platform is provided on the round table, a dust shield assembly is provided on the top platform, a bracket is fixedly connected to the inner side wall of the top platform, a fan is fixedly installed on the bracket, three installation grooves are opened on the top platform, and the three installation grooves are distributed in a circular array, a power assembly is provided on the top platform, a lifting assembly is provided on the power assembly, a connecting assembly is provided on the outer surface of the top platform, an air guide platform is fixedly connected to the lower side of the top platform, and a fixed slide is fixedly connected to the upper side of the top platform.

[0007] By adopting the above technical solution, the bracket is arranged in a cross shape.

[0008] Furthermore, the dust shield assembly includes a dust shield net, an annular slide seat is fixedly connected to the upper side of the dust shield net, a rotating plate is provided on the dust shield net, an annular slide groove is opened on the lower side of the rotating plate, a scraper is fixedly connected to the inner wall of the rotating plate, an annular block is fixedly connected to one side of the scraper, a fixed column is fixedly connected to the middle part of the dust shield net, a connecting plate is fixedly connected to the inner wall of the dust shield net, a plug-in groove is opened on the connecting plate, and the connecting plate is plug-connected to the collecting assembly through the plug-in groove.

[0009] By adopting the above technical solution, the dust shielding assembly can prevent dust from entering the top platform, and the dust on the dust shielding net can be cleaned.

[0010] Furthermore, the dust screen is plug-connected with the top platform through the installation groove, the annular block is rotatably connected with the fixing column, and the annular slide seat is slidably connected with the annular slide groove.

[0011] By adopting the above technical solution, the scraper is in contact with the surface of the dust screen, the rotating plate is arranged in a ring shape, and the dust screen is fixedly connected to the top platform by bolts.

[0012] Furthermore, the collecting assembly includes a collecting seat, the side wall of the collecting seat is fixedly connected with four plug posts, the inner wall of the collecting seat is fixedly connected with a drainage seat, the inner wall of the collecting seat is fixedly connected with a lever, and the collecting seat is plug-connected to the connecting plate via the plug posts and the plug-in slot.

[0013] By adopting the above technical solution, dust can be collected through the collection component to facilitate centralized processing at a later stage.

[0014] Furthermore, the power assembly includes a support seat, a dual-axis motor is fixedly mounted on the upper wall of the support seat, a first gear is fixedly connected to the output end of the dual-axis motor, a rotating seat is fixedly connected to the upper side of the dual-axis motor, a second gear is fixedly connected to the outer surface of the rotating plate, and the support seat is fixedly connected to the upper side of the top platform.

[0015] By adopting the above technical solution, the support seat is concavely arranged, and the first gear is meshed and connected with the second gear to enable the rotating plate to rotate.

[0016] Furthermore, the lifting assembly includes a support, a movable groove is opened in the support, a rotating plate is slidably connected in the movable groove, a screw rod is fixedly connected to the inner wall of the rotating plate, a limiting block is fixedly connected to the upper side of the screw rod, an adjustment seat is threadedly connected to the outer surface of the screw rod, and two adjustment plates are fixedly connected to the side walls of the adjustment seat.

[0017] By adopting the above technical solution, the screw rod passes through the upper side of the support and is rotatably connected to the support, and the two adjustment plates are symmetrically arranged.

[0018] Furthermore, the screw rod includes a first electric push rod arranged on the upper side of the rotating seat, a connecting column is fixedly connected to the upper side of the first electric push rod, a ring plate is rotatably connected to the outer surface of the connecting column, a lifting plate is fixedly connected to the outer surface of the ring plate, a limiting column is fixedly connected to the upper wall of the lifting plate, an insert block is fixedly connected to the upper side of the connecting column, a slot is opened on the lower side of the screw rod, a plurality of limiting grooves are opened on the upper side of the rotating plate, and the limiting column is plug-connected to the limiting groove, a lifting groove is opened on the upper side of the support, and the lifting plate is slidably connected to the lifting groove.

[0019] By adopting the above technical solution, the plug block is plugged into the slot. When the plug block is plugged into the slot, the limit column is separated from the limit slot. When the plug block moves downward and is not plugged into the slot, the limit column is inserted into the limit slot, and the first electric push rod is fixedly connected to the upper side of the swivel seat.

[0020] Furthermore, the connecting assembly includes an upper fixed seat, a plurality of support plates are fixedly connected to the lower side of the upper fixed seat, and a lower fixed seat is commonly fixedly connected to the lower sides of the plurality of support plates, four U-shaped blocks are fixedly connected to the outer surface of the lower fixed seat, and a rotating seat is rotatably connected inside the four U-shaped blocks, and an arc-shaped yarn frame is fixedly connected to the four side walls of the rotating seat, four second electric push rods are fixedly connected to the upper side of the upper fixed seat, and the telescopic ends of the four second electric push rods are fixedly connected to a lifting seat, and the corresponding lifting seat is slidably connected to the corresponding two support plates, a connecting seat is commonly rotatably connected between the lifting seat and the rotating seat, two sliding seats are fixedly connected to the upper side of the upper fixed seat, and the sliding seat is slidably connected to the fixed slide seat, and the upper fixed seat is slidably connected to the top platform.

[0021] By adopting the above technical solution, four U-shaped blocks, four second electric push rods and multiple support plates are distributed in a circular array, and the inner wall of the arc-shaped yarn frame is provided with a yarn storage device and a yarn feeding nozzle. Through the connection component, the height of the yarn storage device and the yarn feeding nozzle can be lowered.

[0022] In summary, the utility model has the following beneficial effects:

[0023] 1. In the present application, by setting a lifting assembly, a sliding seat, a fixed sliding seat, a power assembly and a screw rod, when the plug block is plugged and connected with the slot, the support seat is started, and the rotating seat can drive the screw rod to rotate, so that the adjustment seat drives the adjustment plate and the connecting assembly to move up and down under the action of the sliding seat and the fixed sliding seat, so that the height of the entire yarn feeding mechanism can be adjusted according to the actual situation, which is convenient for use;

[0024] 2. In this application, a dust shield assembly is provided to prevent dust from entering the top platform, and in conjunction with a power assembly, dust accumulated on the dust shield net can be cleaned to avoid clogging of the dust shield mesh holes of the dust shield net, thereby improving the air outlet effect and thus improving the dust removal effect;

[0025] 3. In this application, a collection component is used to collect dust, thereby facilitating centralized processing at a later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of partial structural connection of an embodiment of the utility model;

[0028] Figure 3 It is a schematic diagram of the overall structure of the lifting assembly of an embodiment of the utility model;

[0029] Figure 4 It is a schematic diagram of the overall structure of the power assembly of an embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the overall structure of the screw rod in an embodiment of the utility model;

[0031] Figure 6 It is a schematic diagram of the overall structure of the connection assembly of an embodiment of the utility model;

[0032] Figure 7 This is a schematic diagram of the overall structure of the dust shield assembly of an embodiment of the utility model;

[0033] Figure 8 It is a schematic diagram of the overall structure of the collection component of an embodiment of the utility model;

[0034] In the figure: 1, frame; 2, round table; 3, top table; 4, dust shield assembly; 5, power assembly; 6, lifting assembly; 7, connecting assembly; 8, air guide platform; 9, bracket; 10, fan; 11, mounting slot; 12, fixed slide seat; 51, support seat; 52, double-axis motor; 53, first gear; 54, rotating seat; 55, second gear; 61, support seat; 62, movable slot; 63, rotating plate; 64, screw rod; 65, limit block; 66, adjustment seat; 67, adjustment plate; 641, first electric push rod; 642, connecting column; 643, annular plate; 644, plug block; 645, lifting plate; 64 6. Limiting column; 647. Limiting groove; 648. Lifting groove; 649. Slot; 70. Sliding seat; 71. Upper fixed seat; 72. Support plate; 73. Lower fixed seat; 74. Second electric push rod; 75. U-shaped block; 76. Rotating seat; 77. Lifting seat; 78. Connecting seat; 79. Arc yarn rack; 41. Dust screen; 42. Annular slide; 43. Fixed column; 44. Connecting plate; 45. Plug-in groove; 46. Collecting assembly; 47. Rotating plate; 48. Annular slide; 49. Scraper; 40. Annular block; 461. Collecting seat; 462. Insert column; 463. Push rod; 464. Drainage seat. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with 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, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0036] like Figure 1-8 As shown, the embodiment of the present application discloses a large circular knitting machine with an adjustable yarn supply mechanism, including a frame 1, a round table 2 is provided on the frame 1, a top platform 3 is provided on the round table 2, a dust shield assembly 4 is provided on the top platform 3, a bracket 9 is fixedly connected to the inner wall of the top platform 3, a fan 10 is fixedly installed on the bracket 9, three installation grooves 11 are opened on the top platform 3, and the three installation grooves 11 are distributed in a ring array, a power assembly 5 is provided on the top platform 3, a lifting assembly 6 is provided on the power assembly 5, a connecting assembly 7 is provided on the outer surface of the top platform 3, an air guide platform 8 is fixedly connected to the lower side of the top platform 3, and a fixed slide 12 is fixedly connected to the upper side of the top platform 3.

[0037] In this embodiment, the dust shield assembly 4 includes a dust shield net 41, an annular slide seat 42 is fixedly connected to the upper side of the dust shield net 41, a rotating plate 47 is provided on the dust shield net 41, an annular slide groove 48 is opened on the lower side of the rotating plate 47, a scraper 49 is fixedly connected to the inner wall of the rotating plate 47, and an annular block 40 is fixedly connected to one side of the scraper 49, a fixed column 43 is fixedly connected to the middle part of the dust shield net 41, a connecting plate 44 is fixedly connected to the inner wall of the dust shield net 41, a plug-in groove 45 is opened on the connecting plate 44, and the connecting plate 44 is plugged and connected to the collecting assembly 46 through the plug-in groove 45; the dust shield net 41 is connected to the top through the mounting groove 11 The table 3 is plug-in connected, the annular block 40 is rotatably connected to the fixed column 43, and the annular slide 42 is slidably connected to the annular slide groove 48; the collecting component 46 includes a collecting seat 461, and the side wall of the collecting seat 461 is fixedly connected with four plug-in columns 462, and the inner wall of the collecting seat 461 is fixedly connected with a drainage seat 464, and the inner wall of the collecting seat 461 is fixedly connected with a lever 463, and the collecting seat 461 is plug-in connected with the connecting plate 44 through the plug-in columns 462 and the plug-in groove 45; the power component 5 includes a supporting seat 51, and a dual-axis motor 52 is fixedly installed on the upper wall of the supporting seat 51, and the output end of the dual-axis motor 52 is fixedly connected with The first gear 53, the upper side of the double-axis motor 52 is fixedly connected with a rotating seat 54, the outer surface of the rotating plate 47 is fixedly connected with a second gear 55, and the support seat 51 is fixedly connected to the upper side of the top platform 3; the lifting component 6 includes a support 61, a movable groove 62 is opened in the support 61, a rotating plate 63 is slidably connected in the movable groove 62, a screw rod 64 is fixedly connected to the inner wall of the rotating plate 63, a limited block 65 is fixedly connected to the upper side of the screw rod 64, an adjustment seat 66 is threadedly connected to the outer surface of the screw rod 64, and two adjustment plates 67 are fixedly connected to the side wall of the adjustment seat 66; the screw rod 64 includes a first electric motor arranged on the upper side of the rotating seat 54 Push rod 641, a connecting column 642 is fixedly connected to the upper side of the first electric push rod 641, a ring plate 643 is rotatably connected to the outer surface of the connecting column 642, a lifting plate 645 is fixedly connected to the outer surface of the ring plate 643, a limiting column 646 is fixedly connected to the upper wall of the lifting plate 645, an insert block 644 is fixedly connected to the upper side of the connecting column 642, a slot 649 is opened at the lower side of the screw rod 64, a plurality of limiting grooves 647 are opened at the upper side of the rotating plate 63, and the limiting column 646 is plug-connected with the limiting groove 647, a lifting groove 648 is opened at the upper side of the support 61, and the lifting plate 645 is slidably connected with the lifting groove 648;The connecting assembly 7 includes an upper fixed seat 71, a plurality of support plates 72 are fixedly connected to the lower side of the upper fixed seat 71, a lower fixed seat 73 is fixedly connected to the lower side of the plurality of support plates 72, four U-shaped blocks 75 are fixedly connected to the outer surface of the lower fixed seat 73, a rotating seat 76 is rotatably connected inside the four U-shaped blocks 75, and an arc-shaped yarn frame 79 is fixedly connected to the side walls of the four rotating seats 76, four second electric push rods 74 are fixedly connected to the upper side of the upper fixed seat 71, and the telescopic ends of the four second electric push rods 74 are fixedly connected to the lifting seat 77, and the corresponding lifting seat 77 is slidably connected to the corresponding two support plates 72, and a connecting seat 78 is rotatably connected between the lifting seat 77 and the rotating seat 76, and two sliding seats 70 are fixedly connected to the upper side of the upper fixed seat 71, and the sliding seat 70 is slidably connected to the fixed slide 12, and the upper fixed seat 71 is slidably connected to the top platform 3;

[0038] The operating principle of a large circular knitting machine with an adjustable yarn feeding mechanism in the present embodiment is as follows: the dust screen 41 is first plugged and connected to the top platform 3 through the installation groove 11, and then the dust screen 41 is fixedly connected to the top platform 3 by bolts. At this time, the second gear 55 is meshed and connected with the first gear 53. When it is necessary to lower the height of the yarn storage device and the yarn feeding nozzle, it is only necessary to start the corresponding second electric push rod 74 to move the lifting seat 77 downward, and the corresponding arc-shaped yarn frame 79 is deflected under the action of the rotating seat 76 and the connecting seat 78, so that the height of the yarn storage device and the yarn feeding nozzle in the arc-shaped yarn frame 79 is lowered. When it is necessary to adjust the height of the entire yarn feeding mechanism, it is only necessary to start the first electric push rod 641 to make the connecting column When the connecting column 642 moves upward, the plug block 644 is plugged into the slot 649. When the connecting column 642 moves upward, the annular plate 643 and the lifting plate 645 are driven to move upward under the action of the lifting slot 648, so that the limiting column 646 is separated from the limiting slot 647. At this time, the double-axis motor 52 is started to drive the rotating seat 54 to rotate, so that the screw rod 64 drives the rotating plate 63 to rotate under the action of the movable slot 62, so that the adjusting seat 66 drives the adjusting plate 67 and the upper fixed seat 71 to move up and down under the action of the fixed slide 12 and the sliding seat 70, so that the connecting assembly 7 moves up and down to a suitable height, which is convenient for adjusting the height of the entire yarn feeding mechanism according to actual conditions and is convenient for use. When the dual-axis motor 52 is started, it will drive the first gear 53 to rotate, so that the rotating plate 47 rotates under the action of the second gear 55, the first gear 53, the annular slide groove 48 and the annular slide seat 42, so that the scraper 49 cleans the dust on the surface of the dust screen 41 into the collecting seat 461 for centralized processing later, avoiding the clogging of the dust screen holes of the dust screen 41, improving the air outlet effect, and then improving the dust removal effect. When the dust blocks in the collecting seat 461 are full, it is only necessary to move the lever 463 to disengage the plug post 462 from the plug-in slot 45 to disassemble the collecting assembly 46 for cleaning the collecting seat 461. At the same time, when only the scraper 49 is needed to clean the dust screen 41 When cleaning is performed without the need for the screw rod 64 to rotate, the first electric push rod 641 is started, so that the connecting column 642 drives the annular plate 643 and the plug block 644 to move downward. At this time, the lifting plate 645 moves downward under the action of the lifting slot 648, so that the limiting column 646 is gradually inserted into the corresponding limiting slot 647. When the plug block 644 is completely out of the slot 649, the limiting column 646 is completely inserted into the corresponding limiting slot 647 to facilitate the limiting and fixing of the rotating plate 63. Since the annular plate 643 is rotatably connected to the connecting column 642, the rotating seat 54 will not drive the annular plate 643 to rotate. At this time, the first gear 53 rotates, and the screw rod 64 does not rotate, thereby improving practicality.

[0039] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A circular knitting machine with an adjustable yarn supply mechanism, comprising a frame (1), characterized in that: The frame (1) is provided with a truncated table (2), the truncated table (2) is provided with a top table (3), the top table (3) is provided with a dust shield assembly (4), the inner wall of the top table (3) is fixedly connected with a bracket (9), the bracket (9) is fixedly installed with a fan (10), the top table (3) is provided with three installation grooves (11), and the three installation grooves (11) are distributed in a ring array, the top table (3) is provided with a power assembly (5), the power assembly (5) is provided with a lifting assembly (6), the outer surface of the top table (3) is provided with a connecting assembly (7), the lower side of the top table (3) is fixedly connected with an air guide table (8), and the upper side of the top table (3) is fixedly connected with a fixed slide seat (12).

2. The circular knitting machine with an adjustable yarn supply mechanism according to claim 1, characterized in that: The dust shield assembly (4) comprises a dust shield net (41), the upper side of which is fixedly connected to an annular slide seat (42), a rotating plate (47) is provided on the dust shield net (41), the lower side of which is provided with an annular slide groove (48), the inner side wall of the rotating plate (47) is fixedly connected to a scraper (49), one side of the scraper (49) is fixedly connected to an annular block (40), a fixed column (43) is fixedly connected to the middle part of the dust shield net (41), a connecting plate (44) is fixedly connected to the inner side wall of the dust shield net (41), a plug-in groove (45) is provided on the connecting plate (44), and the connecting plate (44) is plug-connected to a collecting assembly (46) via the plug-in groove (45).

3. The circular knitting machine with an adjustable yarn supply mechanism according to claim 2, characterized in that: The dust screen (41) is plug-connected with the top platform (3) via the mounting groove (11), the annular block (40) is rotationally connected with the fixing column (43), and the annular sliding seat (42) is slidingly connected with the annular sliding groove (48).

4. The circular knitting machine with an adjustable yarn supply mechanism according to claim 3, characterized in that: The collecting assembly (46) comprises a collecting seat (461), the side wall of the collecting seat (461) is fixedly connected with four plug posts (462), the inner wall of the collecting seat (461) is fixedly connected with a drainage seat (464), the inner wall of the collecting seat (461) is fixedly connected with a lever (463), and the collecting seat (461) is plug-connected with the connecting plate (44) via the plug posts (462) and the plug-in slot (45).

5. The circular knitting machine with an adjustable yarn supply mechanism according to claim 4, characterized in that: The power assembly (5) comprises a support seat (51), a dual-axis motor (52) is fixedly mounted on the upper wall of the support seat (51), a first gear (53) is fixedly connected to the output end of the dual-axis motor (52), a rotating seat (54) is fixedly connected to the upper side of the dual-axis motor (52), a second gear (55) is fixedly connected to the outer surface of the rotating plate (47), and the support seat (51) is fixedly connected to the upper side of the top platform (3).

6. The circular knitting machine with an adjustable yarn supply mechanism according to claim 5, characterized in that: The lifting assembly (6) comprises a support (61), a movable groove (62) is formed in the support (61), a rotating plate (63) is slidably connected in the movable groove (62), a screw rod (64) is fixedly connected to the inner side wall of the rotating plate (63), a limit block (65) is fixedly connected to the upper side of the screw rod (64), an adjustment seat (66) is threadedly connected to the outer surface of the screw rod (64), and two adjustment plates (67) are fixedly connected to the side wall of the adjustment seat (66).

7. The circular knitting machine with an adjustable yarn supply mechanism according to claim 6, characterized in that: The screw rod (64) comprises a first electric push rod (641) arranged on the upper side of the rotating seat (54); a connecting column (642) is fixedly connected to the upper side of the first electric push rod (641); an annular plate (643) is rotatably connected to the outer surface of the connecting column (642); a lifting plate (645) is fixedly connected to the outer surface of the annular plate (643); a limiting column (646) is fixedly connected to the upper wall of the lifting plate (645); an insert block (644) is fixedly connected to the upper side of the connecting column (642); a slot (649) is opened on the lower side of the screw rod (64); a plurality of limiting grooves (647) are opened on the upper side of the rotating plate (63); the limiting column (646) is plug-connected to the limiting groove (647); a lifting groove (648) is opened on the upper side of the support (61); and the lifting plate (645) is slidably connected to the lifting groove (648).

8. The circular knitting machine with an adjustable yarn supply mechanism according to claim 7, characterized in that: The connecting assembly (7) comprises an upper fixed seat (71), a plurality of support plates (72) are fixedly connected to the lower side of the upper fixed seat (71), a lower fixed seat (73) is fixedly connected to the lower side of the plurality of support plates (72), four U-shaped blocks (75) are fixedly connected to the outer surface of the lower fixed seat (73), a rotating seat (76) is rotatably connected to the inside of the four U-shaped blocks (75), the side walls of the four rotating seats (76) are fixedly connected to an arc-shaped yarn rack (79), and four The second electric push rod (74), the telescopic ends of the four second electric push rods (74) are all fixedly connected with a lifting seat (77), and the corresponding lifting seat (77) is slidably connected with the corresponding two support plates (72), a connecting seat (78) is rotatably connected between the lifting seat (77) and the rotating seat (76), two sliding seats (70) are fixedly connected to the upper side of the upper fixed seat (71), and the sliding seat (70) is slidably connected with the fixed sliding seat (12), and the upper fixed seat (71) is slidably connected with the top platform (3).

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