Master batch production feeding machine

Abstract

A master batch production feeding machine comprises a weighing platform, a support, a hopper, a feeding pipe, a discharging pipe, a vertical plate, a first motor and a screw. A hose is connected between the top end of the feeding pipe and the bottom end of the hopper. The support comprises an annular top frame and four supporting rods. Clamping blocks are fixed to the front outer side wall and the rear outer side wall of the hopper. Sliding grooves are formed in the side walls of the supporting rods. An inner cavity is formed in the supporting rod. A lead screw is rotationally connected into the sliding groove through a bearing. A driving gear is fixed to the bottom end of the lead screw. And the screw rod is sleeved with a nut seat in a threaded connection manner. One end of the nut seat penetrates through the sliding groove and is fixedly provided with a sliding sleeve slidably arranged outside the supporting rod in a sleeving mode. A fixing rod is fixedly connected between the sliding sleeve and the feeding pipe. And a mounting plate is fixedly connected among the four supporting rods. And a driving structure for driving the four driving gears to rotate simultaneously is arranged on the mounting plate. According to the utility model, the height of the discharge pipe can be freely adjusted according to the use condition, and the discharge pipe is always kept in a vertical state.

Description

Technical Field

[0001] This utility model relates to the technical field of color masterbatch processing equipment, specifically a masterbatch production feeder. Background Technology

[0002] Color masterbatch requires automatic feeding using a loss-in-weight automatic feeder during processing. However, existing feeders have the feeding pipe and hopper directly fixed to the loss-in-weight scale, which limits the height of the discharge port at the other end of the feeding pipe. When dealing with processing equipment with different inlet heights, the entire feeder needs to be raised to adjust to the appropriate height, which is quite troublesome to use.

[0003] Chinese Patent CN217862206U discloses an automatic feeder for masterbatch production, including a weighing platform with a hopper at the top. Two support plates are fixed to one side of the upper surface of the weighing platform, and a vertical plate is rotatably connected between the two support plates. A gearbox and a first motor are fixed to one side of the vertical plate, and a feeding pipe is fixed to the other side of the vertical plate. The feeding pipe has a screw inside, and a discharge pipe is located on the side of the feeding pipe away from the vertical plate. This utility model includes a weighing platform, a hopper, a support frame, a vertical plate, a first motor, a gearbox, a feeding pipe, a discharge pipe, a hose, and an electric telescopic rod. The top of the feeding pipe near the first motor is connected to the bottom of the hopper via a hose. By controlling the extension or retraction of the electric telescopic rod, the first motor, the vertical plate, and the feeding pipe can be tilted, thereby adjusting the height of the discharge pipe. This allows the automatic feeder to adapt to production equipment with different feed inlet heights, improving its applicability.

[0004] However, adjusting the height of the discharge pipe causes it to tilt, resulting in a parabolic trajectory for the material as it exits the pipe, which in turn causes some material to spill.

[0005] Therefore, this utility model proposes a technical solution to solve the problem that the height of the discharge pipe is fixed and cannot be adjusted. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a masterbatch production feeder, which aims to achieve the technical effect that the height of the discharge pipe can be adjusted according to the usage conditions, and the discharge pipe always remains in a vertical state.

[0007] A masterbatch production feeder includes a weighing platform, a support frame, a hopper, a feeding pipe, a discharge pipe, a vertical plate, a first motor, and a screw. The support frame is installed at the top of the weighing platform, and the hopper is installed at the top of the support frame. A flexible hose connects the top of the feeding pipe to the bottom of the hopper. The vertical plate is fixed to the left side of the feeding pipe. The screw is located inside the feeding pipe and extends in the same direction as the feeding pipe, and is rotatably connected to the vertical plate via a bearing. The first motor is installed on the left side of the vertical plate to drive the screw to rotate. The discharge pipe is connected to the right side of the feeding pipe. The support frame includes an annular top frame and four support rods fixedly connected between the annular top frame and the weighing platform. The feeding pipe extends horizontally to the left and right between the front and rear support rods. The discharge pipe extends vertically to the right outside the support frame. The top of the hopper is located at the top of the annular top frame. Above the top frame, the bottom end of the hopper passes through the annular top frame. The front and rear outer walls of the hopper are fixed with locking blocks that are snapped onto the top of the annular top frame. The side walls of the support rod have vertically extending grooves. The support rod has an inner cavity located below the groove. A lead screw is rotatably connected to the groove via a bearing. The bottom end of the lead screw passes into the inner cavity and is fixed with a drive gear. A nut seat is threaded onto the outside of the lead screw. The nut seat moves up and down along the groove, and its outer wall fits against the groove wall. One end of the nut seat passes through the groove and is fixed with a sliding sleeve that is slidably fitted onto the outside of the support rod. A fixing rod is fixedly connected between the sliding sleeve and the feeding pipe. A mounting plate is fixedly connected between the four support rods. The mounting plate is equipped with a drive structure for driving the four drive gears to rotate simultaneously.

[0008] By adopting the above technical solution, when the height of the discharge pipe needs to be adjusted, the drive structure is activated, which drives four drive gears to rotate simultaneously. The drive gears drive the lead screw to rotate. The lead screw drives the nut seat to move up and down along the slide groove. The nut seat drives the sliding sleeve to move up and down along the support rod. The sliding sleeve drives the fixed rod to move up and down. The fixed rod drives the feeding pipe to move up and down. The feeding pipe drives the discharge pipe to move up and down. Thus, the height of the discharge pipe is adjusted. This utility model can freely adjust the height of the discharge pipe according to the usage situation, and the discharge pipe always remains in a vertical state.

[0009] Further features of this invention: The drive structure includes a second motor, a first mounting cavity, and two second mounting cavities. The first mounting cavity and the two second mounting cavities are all located inside the mounting plate. The first mounting cavity is located in the middle of the mounting plate, and the two second mounting cavities are located on the left and right sides of the first mounting cavity, respectively. A first rotating shaft is rotatably connected to the first mounting cavity via bearings. A first gear located inside the first mounting cavity is fixedly sleeved in the middle of the first rotating shaft. The left and right ends of the first rotating shaft respectively pass through the two second mounting cavities and are each fixedly fitted with a second gear. A second rotating shaft is rotatably connected to the second mounting cavity via bearings. A third gear located inside the second mounting cavity and meshing with the second gear is fixedly sleeved on the outside of the second rotating shaft. The front and rear ends of the second rotating shaft respectively pass through the interiors of two corresponding inner cavities and are each fixedly fitted with a fourth gear meshing with a drive gear. The second motor is mounted on the top of the mounting plate. The output shaft of the second motor vertically downwards passes through the first mounting cavity and is fixedly fitted with a drive gear meshing with the first gear.

[0010] By adopting the above technical solution, when the drive structure needs to be activated, the second motor is started, which drives the drive gear to rotate. The drive gear drives the first gear meshing with it to rotate. The first gear drives the first shaft to rotate. The first shaft drives the second gear to rotate. The second gear drives the third gear meshing with it to rotate. The third gear drives the second shaft to rotate. The second shaft drives the fourth gear to rotate. The fourth gear drives the drive gear meshing with it to rotate. Thus, all four drive gears rotate simultaneously.

[0011] A further feature of this invention is that the outer wall of the support rod is provided with scale lines for displaying the height of the feed tube.

[0012] By adopting the above technical solution, the height of the material tube can be quickly and easily determined by observing the index on the scale line corresponding to the bottom of the sliding sleeve.

[0013] Further features of this invention: A mounting block is fixed to the right side of the top of the annular top frame. A cavity is formed inside the mounting block. Slide rails are fixed to both the front and rear sides of the top of the annular top frame. A first fixing block and a second fixing block are fixed to the left and right sides of the slide rails, respectively. The bottom end of the locking block is slidably sleeved on the outside of the slide rail. A sliding rod is fixed to the left side of the locking block. The other end of the sliding rod passes through the first fixing block in a slidable connection and is fixed with a stop block. A spring sleeved on the outside of the sliding rod is fixedly connected between the first fixing block and the locking block. A push rod is fixed to the right side of the locking block. The other end of the push rod passes through the second fixing block in a slidable connection and enters the cavity. A push structure for driving the two push rods to slide back and forth simultaneously is provided in the cavity. The push structure includes a third motor, a cam, and a linkage rod. The linkage rod is located in the cavity and fixedly connected between the two push rods. The cam is rotatably connected in the cavity and fits against the linkage rod. The third motor is installed on the top of the mounting block to drive the cam to rotate.

[0014] By adopting the above technical solution, during the process of material entering the feeding pipe from the hopper through the hose, the third motor is activated. The third motor drives the cam to rotate. When the end of the cam furthest from its axis contacts the linkage rod, the cam pushes the linkage rod to the left. The linkage rod drives the two push rods to move to the left simultaneously. The push rods drive the locking block to slide to the left along the slide rail. The locking block drives the sliding rod to move to the left along the first fixed block. The spring is compressed, forming a rightward rebound force. When the end of the cam closest to its axis contacts the linkage rod, under the action of the spring's rebound force, the sliding rod, locking block, push rod, and linkage rod all move to the right to reset, and the linkage rod always remains in contact with the arc-shaped surface of the cam. Therefore, with the continuous rotation of the cam, the locking block can continuously move back and forth left and right, thereby causing the hopper to vibrate left and right, avoiding material blockage during the feeding process.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. A masterbatch production feeder, wherein the height of the discharge pipe can be freely adjusted according to the usage, and the discharge pipe always remains vertical.

[0017] 2. During the feeding process, the hopper can vibrate continuously from side to side to avoid material blockage. Attached Figure Description

[0018] Figure 1 This is a front view of a masterbatch production feeder according to this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of a masterbatch production feeder according to the present invention;

[0020] Figure 3This is a partial sectional view from the side of a masterbatch production feeder according to the present invention;

[0021] Figure 4 This is a front-view sectional view of the mounting plate of a masterbatch production feeder according to the present invention;

[0022] Figure 5 This is a top sectional view of the mounting plate of a masterbatch production feeder according to the present invention.

[0023] Figure 6 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 7 This is a top view of the annular top frame and hopper of a masterbatch production feeder according to this utility model.

[0025] Reference numerals: 1. Weighing platform; 2. Support frame; 3. Hopper; 4. Feeding pipe; 5. Discharge pipe; 6. Vertical plate; 7. First motor; 8. Screw; 9. Annular top frame; 10. Support rod; 11. Mounting block; 12. Cavity; 13. Slide rail; 14. Scale line; 15. First fixing block; 16. Second fixing block; 17. Locking block; 18. Sliding rod; 19. Stop block; 20. Spring; 21. Push rod; 22. Third motor; 23. Convex 24. Wheel; 25. Linkage rod; 26. Slide groove; 27. Inner cavity; 28. Lead screw; 29. ​​Drive gear; 30. Nut seat; 31. Sliding sleeve; 32. Mounting plate; 33. Second motor; 34. First mounting cavity; 35. Second mounting cavity; 36. First rotating shaft; 37. First gear; 38. Second rotating shaft; 39. Third gear; 40. Fourth gear; 41. Drive gear; 42. Fixed rod; 43. Flexible hose. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] A masterbatch production feeder, such as Figures 1-7 As shown, it includes a weighing platform 1, a support 2, a hopper 3, a feeding pipe 4, a discharge pipe 5, a vertical plate 6, a first motor 7, and a screw 8.

[0028] The bracket 2 is installed at the top of the weighing platform 1. The bracket 2 includes an annular top frame 9 and four support rods 10 fixedly connected between the annular top frame 9 and the weighing platform 1. A mounting block 11 is fixed to the right side of the top of the annular top frame 9. A cavity 12 is opened inside the mounting block 11. Slide rails 13 are fixed to both the front and rear sides of the top of the annular top frame 9. A first fixing block 15 and a second fixing block 16 are fixed to the left and right sides of the slide rail 13, respectively. A locking block 17 is slidably fitted at the top of the slide rail 13. A sliding rod 18 is fixed to the left side of the locking block 17. The other end of the sliding rod 18 passes through the first fixing block 15 in a slidable connection and is fixed with a stop block 19. The stop block 19 is set to prevent the sliding rod 18 from detaching from the first fixing block 15. A spring 20 is fixedly connected between the first fixing block 15 and the locking block 17 and sleeved on the outside of the sliding rod 18. A push rod 21 is fixed to the right side of the locking block 17. The other end of the push rod 21 passes through the second fixed block 16 and into the cavity 12 via a slidable connection. A pushing structure is provided within the cavity 12 to drive the two push rods 21 to slide back and forth simultaneously. The pushing structure includes a third motor 22, a cam 23, and a linkage rod 24. The linkage rod 24 is located within the cavity 12 and fixedly connected between the two push rods 21. The cam 23 is rotatably connected within the cavity 12 and engages with the linkage rod 24. The third motor 22 is mounted on the top of the mounting block 11 to drive the cam 23 to rotate.

[0029] The support rod 10 has a vertically extending groove 25 on its side wall. An inner cavity 26 is located below the groove 25 inside the support rod 10. A lead screw 27 is rotatably connected to the groove 25 via a bearing. The bottom end of the lead screw 27 passes through the inner cavity 26 and is fixed with a drive gear 28. A nut seat 29 is threaded onto the outside of the lead screw 27. The nut seat 29 moves up and down along the groove 25, and its outer wall fits against the groove wall of the groove 25. One end of the nut seat 29 passes through the groove 25 and is fixed with a sliding sleeve 30 that is slidably fitted onto the outside of the support rod 10.

[0030] A mounting plate 31 located below the slide groove 25 is fixedly connected between four support rods 10. The mounting plate 31 is equipped with a drive structure for simultaneously rotating four drive gears 28. The drive structure includes a second motor 32, a first mounting cavity 33, and two second mounting cavities 34. The first mounting cavity 33 and the two second mounting cavities 34 are all located inside the mounting plate 31. The first mounting cavity 33 is located in the middle of the mounting plate 31. The two second mounting cavities 34 are located on the left and right sides of the first mounting cavity 33, respectively. A first rotating shaft 35 is rotatably connected to the first mounting cavity 33 via bearings. A first gear 36 located within the first mounting cavity 33 is fixedly sleeved in the middle of the first rotating shaft 35. The left and right ends of the first rotating shaft 35 respectively pass into the two second mounting cavities 34 and are each fixedly fitted with a second gear 37. A second rotating shaft 38 is rotatably connected to the second mounting cavity 34 via bearings. A third gear 39 located within the second mounting cavity 34 and meshing with the second gear 37 is fixedly sleeved on the outside of the second rotating shaft 38. The front and rear ends of the second rotating shaft 38 are respectively inserted into the interiors of two corresponding inner cavities 26, and a fourth gear 40 that meshes with the drive gear 28 is fixed in each cavity. The second motor 32 is mounted on the top of the mounting plate 31. The output shaft of the second motor 32 is vertically inserted into the first mounting cavity 33 and a drive gear 41 that meshes with the first gear 36 is fixed in the shaft.

[0031] The top of the hopper 3 is located above the annular top frame 9, the bottom of the hopper 3 passes through the annular top frame 9, and the front and rear outer side walls of the hopper 3 are fixedly connected to two locking blocks 17 respectively.

[0032] The feeding pipe 4 is located between the front and rear support rods 10 and extends horizontally to the left and right. A fixing rod 42 is fixedly connected between the feeding pipe 4 and the sliding sleeve 30. The vertical plate 6 is fixed to the left side of the feeding pipe 4. The screw 8 is located inside the feeding pipe 4 and extends in the same direction as the feeding pipe 4, and is rotatably connected to the vertical plate 6 via a bearing. The first motor 7 is installed on the left side of the vertical plate 6 to drive the screw 8 to rotate. The discharge pipe 5 is connected to the right side of the feeding pipe 4 and extends vertically to the outside of the bracket 2. A flexible hose 43 is connected between the top end of the feeding pipe 4 and the bottom end of the hopper 3.

[0033] Additionally, the outer wall of the support rod 10 is provided with a scale line 14 to indicate the height of the feed tube 5. By observing the index on the scale line 14 corresponding to the bottom end of the sliding sleeve 30, the height of the feed tube 5 can be quickly and easily determined.

[0034] Working principle:

[0035] When the height of the discharge pipe 5 needs to be adjusted, the second motor 32 is started, which drives the drive gear 41 to rotate. The drive gear 41 drives the first gear 36, which meshes with it, to rotate. The first gear 36 drives the first rotating shaft 35 to rotate. The first rotating shaft 35 drives the second gear 37 to rotate. The second gear 37 drives the third gear 39, which meshes with it, to rotate. The third gear 39 drives the second rotating shaft 38 to rotate. The second rotating shaft 38 drives the fourth gear 40 to rotate. The fourth gear 40 drives the drive gear 28, which meshes with it, to rotate. This achieves simultaneous rotation of all four drive gears 28. The drive gear 28 drives the lead screw 27 to rotate. The lead screw 27 drives the nut seat 29 to move up and down along the slide groove 25. The nut seat 29 drives the sliding sleeve 30 to move up and down along the support rod 10. The sliding sleeve 30 drives the fixed rod 42 to move up and down. The fixed rod 42 drives the feed pipe 4 to move up and down. The feed pipe 4 drives the discharge pipe 5 to move up and down. This completes the adjustment of the height of the discharge pipe 5.

[0036] During material feeding, as the material enters the feeding pipe 4 from the hopper 3 via the hose 43, the third motor 22 is activated. The third motor 22 drives the cam 23 to rotate. When the end of the cam 23 furthest from its axis contacts the linkage rod 24, the cam 23 pushes the linkage rod 24 to the left. The linkage rod 24 drives the two push rods 21 to move to the left simultaneously. The push rods 21 drive the locking block 17 to slide to the left along the slide rail 13. The locking block 17 drives the sliding rod 18 to move to the left along the first fixed block 15. The spring 20 is compressed, generating a rightward rebound force. When the end of the cam 23 closest to its axis contacts the linkage rod 24, under the action of the spring 20's rebound force, the sliding rod 18, locking block 17, push rod 21, and linkage rod 24 all move to the right and reset, and the linkage rod 24 always remains in contact with the arc-shaped surface of the cam 23. Therefore, with the continuous rotation of cam 23, the clamping block 17 can move back and forth continuously, thereby causing the hopper 3 to vibrate left and right, avoiding material blockage during the feeding process. When the material enters the feeding pipe 4, the first motor 7 is started, and the first motor 7 drives the screw 8 to rotate, thereby pushing the material into the discharge pipe 5. The material falls vertically through the discharge pipe 5 into the external processing inlet.

[0037] This invention allows for free adjustment of the height of the discharge pipe 5 according to usage conditions, and the discharge pipe 5 always remains vertical. Furthermore, the hopper 3 continuously vibrates left and right during the feeding process to prevent material blockage.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A masterbatch production feeder, comprising a weighing platform (1), a support (2), a hopper (3), a feeding pipe (4), a discharge pipe (5), a vertical plate (6), a first motor (7), and a screw (8), wherein the support (2) is installed at the top of the weighing platform (1), the hopper (3) is installed at the top of the support (2), a flexible hose (43) is connected between the top of the feeding pipe (4) and the bottom of the hopper (3), the vertical plate (6) is fixed to the left side of the feeding pipe (4), the screw (8) is located inside the feeding pipe (4) and is aligned with the extension direction of the feeding pipe (4), and is rotatably connected to the vertical plate (6) via a bearing, the first motor (7) is installed on the left side of the vertical plate (6) for driving the screw (8) to rotate, and the discharge pipe (5) is connected to the right side of the feeding pipe (4), characterized in that: The support (2) includes an annular top frame (9) and four support rods (10) fixedly connected between the annular top frame (9) and the weighing platform (1). The feeding pipe (4) extends horizontally to the left and right between the support rods (10) on the front and rear sides. The discharge pipe (5) extends vertically to the top and bottom outside the support (2). The top of the hopper (3) is located above the annular top frame (9), and the bottom of the hopper (3) passes through the annular top frame (9). The front and rear outer walls of the hopper (3) are fixed with locking blocks (17) that are locked to the top of the annular top frame (9). The side walls of the support rods (10) are provided with vertically extending grooves (25). The inside of the support rods (10) is provided with an inner cavity (26) located below the grooves (25). 25) A lead screw (27) is rotatably connected to the inner cavity (26) via a bearing. The bottom end of the lead screw (27) passes into the inner cavity (26) and is fixed with a drive gear (28). A nut seat (29) is threadedly connected to the outside of the lead screw (27). The nut seat (29) moves up and down along the slide groove (25) and its outer side wall fits against the groove wall of the slide groove (25). One end of the nut seat (29) passes through the slide groove (25) and is fixed with a sliding sleeve (30) that is slidably sleeved on the outside of the support rod (10). A fixing rod (42) is fixedly connected between the sliding sleeve (30) and the feeding pipe (4). An mounting plate (31) is fixedly connected between the four support rods (10). A drive structure for driving the four drive gears (28) to rotate simultaneously is provided on the mounting plate (31).

2. The masterbatch production feeder according to claim 1, characterized in that: The drive structure includes a second motor (32), a first mounting cavity (33), and two second mounting cavities (34). The first mounting cavity (33) and the two second mounting cavities (34) are all located inside the mounting plate (31). The first mounting cavity (33) is located in the middle of the mounting plate (31), and the two second mounting cavities (34) are located on the left and right sides of the first mounting cavity (33), respectively. A first rotating shaft (35) is rotatably connected to the first mounting cavity (33) through a bearing. A first gear (36) located in the first mounting cavity (33) is fixedly sleeved in the middle of the first rotating shaft (35). The left and right ends of the first rotating shaft (35) respectively pass into the two second mounting cavities (34). The second mounting cavity (34) is fixed with a second gear (37). The second mounting cavity (34) is rotatably connected to a second shaft (38) through a bearing. The second shaft (38) is fixedly sleeved with a third gear (39) located in the second mounting cavity (34) and meshing with the second gear (37). The front and rear ends of the second shaft (38) are respectively inserted into the interior of two corresponding inner cavities (26) and are fixed with a fourth gear (40) meshing with the drive gear (28). The second motor (32) is installed on the top of the mounting plate (31). The output shaft of the second motor (32) is vertically inserted into the first mounting cavity (33) and is fixed with a drive gear (41) meshing with the first gear (36).

3. The masterbatch production feeder according to claim 2, characterized in that: The outer wall of the support rod (10) is provided with scale lines (14) for displaying the height of the feed tube (5).

4. The masterbatch production feeder according to claim 1, characterized in that: A mounting block (11) is fixed to the right side of the top of the annular top frame (9). A cavity (12) is provided inside the mounting block (11). Slide rails (13) are fixed to the front and rear sides of the top of the annular top frame (9). A first fixing block (15) and a second fixing block (16) are fixed to the left and right sides of the slide rails (13), respectively. The bottom end of the locking block (17) is slidably sleeved on the outside of the slide rails (13). A sliding rod (18) is fixed to the left side of the locking block (17). The other end of the sliding rod (18) passes through the first fixing block (15) in a sliding connection and is fixed with a stop block (19). A spring (2) sleeved on the outside of the sliding rod (18) is fixedly connected between the first fixing block (15) and the locking block (17). 0), a push rod (21) is fixed on the right side of the card block (17). The other end of the push rod (21) passes through the second fixed block (16) and enters the cavity (12) in a sliding connection manner. The cavity (12) is provided with a push structure for driving the two push rods (21) to slide back and forth simultaneously. The push structure includes a third motor (22), a cam (23) and a linkage rod (24). The linkage rod (24) is located in the cavity (12) and is fixedly connected between the two push rods (21). The cam (23) is rotatably connected in the cavity (12) and fits against the linkage rod (24). The third motor (22) is installed on the top of the mounting block (11) to drive the cam (23) to rotate.

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