A coiling machine reel unloading mechanism

Abstract

The present invention relates to the field of coiling facilities, and in particular to a coiling machine reel unloading mechanism, comprising a mounting seat, a driving assembly is mounted on the upper rear portion of the mounting seat, a reel is installed through the driving assembly, a plurality of expansion blocks are elastically installed through a linear array on the outer surface of the reel, a square expansion rod is fitted inside the reel, the square expansion rod passes through the rear end of the reel, the end of the expansion block fits with the square expansion rod, a moving part is mounted on the upper front portion of the mounting seat, a V-shaped material support seat is connected to the upper end of the moving part, a push rack is rotatably mounted on the rear end of the square expansion rod, a shift rack is fitted on the lower end of the push rack, the shift rack passes through the bottom of the driving assembly, and the end of the shift rack is connected to the moving part. The present invention improves the convenience of unloading, and can adapt to the unloading of steel coils of different diameters, effectively meeting the use requirements.

Description

Technical Field

[0001] The invention relates to the field of coiling facilities, and in particular to a coiling drum unloading mechanism for a coiler. Background Art

[0002] Coilers are mainly used to coil long rolled products into coils or plates. In modern cold-rolled strip workshops, coilers are also widely used in shearing, pickling, polishing and heat treatment after grinding, tinning and galvanizing. When the coiler unloads the steel after coiling, workers are first required to control the movement of the rack to support the steel coil. Then the workers need to further operate to remove the reel fixed on the reel. Only then can the steel coil be removed through the rack to complete the unloading. The process requires workers to perform secondary operations, which makes the unloading process quite cumbersome and seriously affects the convenience of unloading. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the background technology and to propose a winding machine reel unloading mechanism.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a winder reel unloading mechanism, comprising a mounting seat, a driving assembly is installed at the upper rear end of the mounting seat, a reel is installed through the driving assembly, a linear array is installed through the outer surface of the reel with multiple groups of expansion blocks elastically installed, a square expansion rod is fitted inside the reel, the square expansion rod passes through the rear end of the reel, the end of the expansion block is fitted with the square expansion rod, a moving part is installed at the upper front end of the mounting seat, a V-shaped material supporting seat is connected to the upper end of the moving part, a push rack is rotatably installed on the rear end of the square expansion rod, a shift rack is fitted on the lower end of the push rack, the shift rack passes through the bottom of the driving assembly, and the end of the shift rack is connected to the moving part.

[0005] Preferably, there are multiple expansion blocks in each group, and the multiple expansion blocks are arranged in a circular array, a square guide seat is slidably installed through the middle of the rear end of the push frame, an L-shaped fixing frame is inlaid on the rear end of the square guide seat, and the end of the L-shaped fixing frame is fixed to the mounting seat, a rear shift block is extended at the rear edge of the side of the shift frame, the rear shift block is attached to the rear end surface of the push frame, and a front shift block is extended from the side of the shift frame, and the front shift block is located in front of the rear shift block.

[0006] Preferably, the outer surface of the reel is evenly distributed with a plurality of guide grooves, the expansion block fits inside the guide grooves, the front and rear end surfaces inside the guide grooves are provided with accommodating grooves, the front and rear end of the expansion block are extended with lugs, the lugs fit inside the accommodating grooves, the side surfaces of the lugs are fixedly installed with a compression spring, the end of the compression spring is fixed to the inner side surface of the accommodating groove, the outer surface of the square expansion rod is provided with a plurality of sinking grooves in a linear array, and the edges of the sinking grooves are inclined.

[0007] Preferably, the movable part includes a threaded rod installed at the front part of the upper end of the mounting seat, a threaded ring is screwed on the outer surface of the threaded rod, a propulsion seat is fixedly installed on the upper end of the threaded ring, two guide shells are symmetrically fixedly installed on the upper end of the propulsion seat, a guide block is fitted inside the guide shell, the guide block passes through the upper end of the guide shell, the end of the guide block is fixed to the lower end of the V-shaped support seat, and the front end of the shifting frame is fixed to the rear end of the propulsion seat.

[0008] Preferably, supports are rotatably installed at both ends of the threaded rod, the lower ends of the supports are fixed to the mounting seats, a slide is fixedly installed between the two supports, a concave slider extends from the lower end of the threaded ring, the concave slider fits the outer surface of the slide, a servo motor is fixedly installed at the rear end of the threaded rod, the servo motor is fixed on the mounting seat, and the servo motor is located below the drive assembly.

[0009] Preferably, lower brackets are provided on both sides of the propulsion seat, wheel frames are fixedly mounted on the sides of the guide blocks, top wheels are mounted on the ends of the wheel frames, the top wheels are attached to the upper ends of the lower brackets, and the lower brackets are connected to the mounting seat.

[0010] Preferably, a support plate is fixedly installed on the lower end of the lower bracket, and the lower end of the support plate is fixed to the mounting seat, a lower inclined frame is rotatably installed on the rear end of the lower bracket, an upper inclined frame is fitly installed on the outer side of the lower inclined frame, and an upper bracket is rotatably installed on the end of the upper inclined frame, a connecting seat is provided directly below the upper bracket, the connecting seat is fixed to the mounting seat, and two guide sleeves are symmetrically fixedly installed on the upper end of the connecting seat, a guide rod is fitly installed on the inside of the guide sleeve, the guide rod passes through the upper end of the guide sleeve, and the end of the guide rod is fixed to the upper bracket.

[0011] Preferably, a threaded column is fixedly installed in the middle of the upper end of the connecting seat, and the threaded column is located between the two guide sleeves. A threaded sleeve is screwed on the outer surface of the threaded column, and a connecting ring is rotatably installed on the upper end of the threaded sleeve. A plurality of connecting columns are fixedly installed in a circular array at the upper end of the connecting ring, and the ends of the connecting columns are fixed to the upper bracket. Slide grooves are penetrated on both sides of the upper inclined frame, and sliding ears are extended on both sides of the lower inclined frame, and the sliding ears fit into the inside of the slide grooves.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The rotating threaded rod can drive the threaded ring to move, and then drive the V-shaped support seat on the push seat to move. At this time, the concave slider slides on the slide seat to assist the movement of the V-shaped support seat. In this process, the top wheel will roll from the lower bracket through the lower inclined frame and the upper inclined frame to the upper bracket, so that the V-shaped support seat can gradually move up during the movement to fit the lower end of the steel coil. At this time, the front block on the shifting frame moves synchronously with the push seat and just fits on the push frame. Then the push seat continues to move backward, allowing the front block on the shifting frame to The push frame can be pushed so that the square expansion rod on the push frame can slide backward in the reel, and the expansion block can be pushed by the compression spring and retracted and fit into the sinking groove when the square expansion rod is lost. That is, the tightened reel can be loosened, so that the gravity of the steel coil wound on the reel can be transferred to the V-shaped supporting seat. Then the pushing seat moves in the opposite direction, which can drive the V-shaped supporting seat forward to remove the steel coil from the reel and complete the unloading. The process does not require workers to perform secondary operations, thereby effectively improving the convenience of unloading.

[0014] 2. By rotating the threaded sleeve, the threaded sleeve can be moved on the threaded column, thereby driving the upper bracket to move. At this time, the sliding ear on the lower inclined frame slides in the sliding groove on the upper inclined frame to change the total length of the upper inclined frame and the lower inclined frame to adapt to the movement of the upper bracket, thereby adjusting the height of the upper bracket, that is, adjusting the upward height of the V-shaped supporting seat after movement to adapt to the unloading of steel coils of different diameters, thereby meeting the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a coiling and unloading mechanism of a coiling machine of the present invention;

[0016] Figure 2 The present invention is a coiling machine reel unloading mechanism Figure 1 A magnified view of middle;

[0017] Figure 3 The present invention is a coiling machine reel unloading mechanism Figure 1 Enlarged view of middle B;

[0018] Figure 4 It is a connection view of an expansion block of a reel unloading mechanism of a reeling machine according to the present invention;

[0019] Figure 5 It is a schematic diagram of a square expansion rod of a reel material unloading mechanism of a reeling machine according to the present invention;

[0020] Figure 6 It is a schematic diagram of another viewing angle of a reel unloading mechanism of a reel-up machine of the present invention;

[0021] Figure 7 The present invention is a coiling machine reel unloading mechanism Figure 6 Enlarged view of C in the middle.

[0022] In the figure: 1, mounting seat; 2, connecting seat; 3, driving assembly; 4, reel; 5, expansion block; 6, shifting frame; 7, V-shaped support seat; 8, pushing seat; 9, support plate; 10, square expansion rod; 11, sinking groove; 12, guide sleeve; 13, guide rod; 14, connecting column; 15, threaded column; 16, connecting ring; 17, threaded sleeve; 18, lower bracket; 19, lower inclined frame; 20, slide groove; 21, sliding ear; 22, Upper inclined frame; 23, upper bracket; 24, top wheel; 25, wheel frame; 26, guide shell; 27, guide block; 28, servo motor; 29, front derailleur block; 30, support; 31, threaded rod; 32, threaded ring; 33, concave slider; 34, slide seat; 35, L-shaped fixing frame; 36, square guide seat; 37, rear derailleur block; 38, push frame; 39, receiving groove; 40, lug; 41, compression spring; 42, guide groove. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] like Figure 1-Figure 7 A winding machine reel unloading mechanism shown in the figure includes a mounting seat 1, and a driving assembly 3 is installed at the upper rear part of the mounting seat 1. The driving assembly 3 includes components such as a motor and a reduction gear set. The motor is mainly used to drive the reel 4 to rotate slowly through the reduction gear set to realize the winding operation. Since the above-mentioned driving method is a prior art and has been widely used, it is not elaborated in detail here. The reel 4 is installed through the driving assembly 3, and a plurality of expansion blocks 5 are elastically installed through a linear array on the outer surface of the reel 4. The expansion blocks 5 play the role of tightening and fixing the reel, and a square expansion rod 10 is fitted inside the reel 4. The square expansion rod 10 plays the role of pushing out the expansion block 5. The square expansion rod 10 passes through the rear end of the reel 4, and the end of the expansion block 5 fits with the square expansion rod 10. A moving part is installed at the front of the upper end of the mounting seat 1, and the upper end of the moving part is connected to a V-shaped support seat 7. The V-shaped support seat 7 plays the role of supporting the steel coil. The rear end of the square expansion rod 10 is rotatably installed with a push rack 38, and the lower end of the push rack 38 is fitted with a shift rack 6. The push rack 38 plays the role of pushing the square expansion rod 10. The shift rack 6 passes through the bottom of the driving assembly 3, and the end of the shift rack 6 is connected to the moving part, and the shift rack 6 plays the role of shifting the push rack 38.

[0025] There are multiple expansion blocks 5 in each group, and the multiple expansion blocks 5 are arranged in a circular array. A square guide seat 36 is slidably installed through the middle of the rear end of the push frame 38. The square guide seat 36 plays a role in guiding the push frame 38. The rear end of the square guide seat 36 is inlaid with an L-shaped fixing frame 35. The L-shaped fixing frame 35 plays a role in fixing the square guide seat 36. The end of the L-shaped fixing frame 35 is fixed to the mounting seat 1. A rear shift block 37 is extended at the rear edge of the side of the shift frame 6. The rear shift block 37 is attached to the rear end surface of the push frame 38. The rear shift block 37 can shift the push frame 38 forward, thereby driving the square expansion rod 10 to move forward and push out the expansion block 5. A front shift block 29 is extended from the side of the shift frame 6. The front shift block 29 is located in front of the rear shift block 37. The front shift block 29 can shift the push frame 38 backward, allowing the square expansion rod 10 to move backward, so that the expansion block 5 is received in the sinking groove 11.

[0026] The outer surface of the reel 4 is evenly distributed with a plurality of guide grooves 42, and the expansion block 5 fits inside the guide grooves 42. The guide grooves 42 serve to guide the expansion block 5. The front and rear end surfaces of the guide grooves 42 are both provided with accommodating grooves 39. The front and rear end of the expansion block 5 are both extended with lugs 40. The accommodating grooves 39 serve to accommodate a compression spring 41. The lug 40 fits inside the accommodating groove 39. A compression spring 41 is fixedly installed on the side of the lug 40. The compression spring 41 can push the lug 40 so that the expansion block 5 can enter the sinking groove 11. The end of the compression spring 41 is fixed to the inner side of the accommodating groove 39. The outer surface of the square expansion rod 10 is provided with a plurality of sinking grooves 11 in a linear array. The edges of the sinking grooves 11 are inclined to facilitate the passage of the expansion block 5.

[0027] The moving part includes a threaded rod 31 installed at the front part of the upper end of the mounting seat 1, and a threaded ring 32 is screwed on the outer surface of the threaded rod 31. The threaded rod 31 and the threaded ring 32 play the role of driving the propulsion seat 8 to move. The upper end of the threaded ring 32 is fixedly installed with the propulsion seat 8, and the upper end of the propulsion seat 8 is symmetrically fixedly installed with two guide shells 26. The inside of the guide shell 26 is fitted with a guide block 27, and the guide block 27 passes through the upper end of the guide shell 26. The guide shell 26 and the guide block 27 play the role of guiding the V-shaped supporting seat 7. The end of the guide block 27 is fixed to the lower end of the V-shaped supporting seat 7, and the front end of the shifting frame 6 is fixed to the rear end of the propulsion seat 8.

[0028] Supports 30 are rotatably installed at both ends of the threaded rod 31, and the lower ends of the supports 30 are fixed to the mounting seat 1. The supports 30 play a role in supporting the threaded rod 31. A slide 34 is fixedly installed between the two supports 30. A concave slider 33 extends from the lower end of the threaded ring 32. The concave slider 33 fits the outer surface of the slider 34. The slider 34 and the concave slider 33 play a role in guiding the threaded ring 32. A servo motor 28 is fixedly installed at the rear end of the threaded rod 31. The servo motor 28 is fixed on the mounting seat 1. The servo motor 28 plays a role in driving the threaded rod 31 to rotate. The servo motor 28 is located below the drive assembly 3.

[0029] A lower bracket 18 is provided on both sides of the propulsion seat 8, and a wheel frame 25 is fixedly installed on the side of the guide block 27. The wheel frame 25 plays the role of supporting the top wheel 24. The lower bracket 18 can support the downward-moving V-shaped supporting seat 7 during unloading to lower the height of the steel coil on the V-shaped supporting seat 7 to facilitate the subsequent lifting operation of the steel coil. A top wheel 24 is installed on the end of the wheel frame 25. The top wheel 24 is attached to the upper end of the lower bracket 18. The top wheel 24 plays the role of reducing friction. The lower bracket 18 is connected to the mounting seat 1.

[0030] The lower end of the lower bracket 18 is fixedly installed with a support plate 9, and the lower end of the support plate 9 is fixed to the mounting seat 1. The support plate 9 plays a role in fixing the lower bracket 18. The rear end of the lower bracket 18 is rotatably installed with a lower inclined frame 19, and the outer side of the lower inclined frame 19 is fitted with an upper inclined frame 22. The end of the upper inclined frame 22 is rotatably installed with an upper bracket 23. The lower inclined frame 19 and the upper inclined frame 22 play a role in allowing the V-shaped support seat 7 to move upward, and the upper bracket 23 can support the upwardly moved V-shaped support seat 7, so that the V-shaped support seat 7 can be with the winding The completed steel coils are supported by contacting each other, and a connecting seat 2 is arranged directly below the upper bracket 23. The connecting seat 2 is fixed to the mounting seat 1, and the connecting seat 2 plays the role of supporting the guide sleeve 12 and the threaded column 15. Two guide sleeves 12 are symmetrically fixedly installed on the upper end of the connecting seat 2, and a guide rod 13 is fitted inside the guide sleeve 12. The guide sleeve 12 and the guide rod 13 play the role of guiding the upper bracket 23. The guide rod 13 passes through the upper end of the guide sleeve 12, and the end of the guide rod 13 is fixed to the upper bracket 23.

[0031] A threaded column 15 is fixedly installed in the middle of the upper end of the connecting seat 2. The threaded column 15 is located between the two guide sleeves 12. A threaded sleeve 17 is screwed on the outer surface of the threaded column 15. The threaded column 15 and the threaded sleeve 17 play the role of adjusting the height of the upper bracket 23. A connecting ring 16 is rotatably installed on the upper end of the threaded sleeve 17. A plurality of connecting columns 14 are fixedly installed in a circular array on the upper end of the connecting ring 16. The connecting ring 16 and the connecting column 14 play the role of connecting the threaded sleeve 17 and the upper bracket 23. The end of the connecting column 14 is fixed to the upper bracket 23. Slide grooves 20 are provided on both sides of the upper inclined frame 22, and both sides of the lower inclined frame 19 Both are extended with sliding ears 21, and the slide groove 20 and the sliding ears 21 play the role of changing the total length between the lower inclined frame 19 and the upper inclined frame 22. The sliding ear 21 fits inside the slide groove 20, and the threaded sleeve 17 is rotated to allow the threaded sleeve 17 to move on the threaded column 15, thereby driving the upper bracket 23 to move. At this time, the sliding ear 21 on the lower inclined frame 19 slides in the slide groove 20 on the upper inclined frame 22 to change the total length of the upper inclined frame 22 and the lower inclined frame 19 to adapt to the movement of the upper bracket 23, thereby adjusting the height of the upper bracket 23, that is, adjusting the upward height of the V-shaped supporting seat 7 after movement, so as to adapt to the unloading of steel coils of different diameters.

[0032] When winding, the reel is put on the reel 4. At this time, the propulsion seat 8 moves forward, thereby driving the shifting frame 6 to move forward, allowing the rear shifting block 37 on the shifting frame 6 to push the push frame 38, so that the square expansion rod 10 can slide forward in the reel 4, allowing the expansion block 5 located in the sinking groove 11 to slide onto the square expansion rod 10, so that the expansion block 5 can move outward under the push of the square expansion rod 10, so as to extend from the surface of the reel 4 to tighten the reel on the reel 4, and then the driving component 3 works to drive the reel on the reel 4 to rotate to reel the steel. After the winding is completed, the servo motor 28 drives the threaded rod 31 to rotate, and the rotating threaded rod 31 can drive the threaded ring 32 to move, thereby driving the V-shaped support seat 7 on the propulsion seat 8 to move. At this time, the concave sliding block 33 slides on the sliding seat 34 to assist the V-shaped support seat 7 to move. The top wheel 24 will roll from the lower bracket 18 through the lower inclined frame 19 and the upper inclined frame 22 to the upper bracket 23, so that the V-shaped support seat 7 can gradually move up during the movement to fit the lower end of the steel coil. At this time, the front shift block 29 on the shift frame 6 moves synchronously with the propulsion seat 8 and just fits on the push frame 38. Then the propulsion seat 8 continues to move backward, allowing the front shift block 29 on the shift frame 6 to push the push frame 38, so that the square expansion rod 10 on the push frame 38 can slide backward in the reel 4, and the expansion block 5 is pushed by the compression spring 41 when the square expansion rod 10 is lost. The support is retracted and fits in the sinking groove 11, that is, the tightened reel is loosened, so that the gravity of the steel coil wound on the reel can be transferred to the V-shaped support seat 7, and then the propulsion seat 8 moves in the opposite direction, which can drive the V-shaped support seat 7 to move forward, so as to remove the steel coil from the reel 4 and complete the unloading.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A reel unloading mechanism for a reel, comprising a mounting seat (1), a driving assembly (3) being mounted on the rear upper end of the mounting seat (1), a reel (4) being mounted through the driving assembly (3), characterized in that: The outer surface of the reel (4) is elastically provided with a plurality of expansion blocks (5) in a linear array, the interior of the reel (4) is fitted with a square expansion rod (10), the square expansion rod (10) extends from the rear end of the reel (4), the end of the expansion block (5) is fitted with the square expansion rod (10), the front upper end of the mounting seat (1) is provided with a moving part, the upper end of the moving part is connected to a V-shaped support seat (7), the rear end of the square expansion rod (10) is rotatably provided with a push frame (38), the lower end of the push frame (38) is fitted with a shifting frame (6), the shifting frame (6) passes from below the driving assembly (3), and the end of the shifting frame (6) is connected to the moving part; The number of the expansion blocks (5) in each group is multiple, and the multiple expansion blocks (5) are arranged in a circular array. A square guide seat (36) is slidably installed through the middle of the rear end of the push frame (38), and the rear end of the square guide seat (36) is inlaid with an L-shaped fixing frame (35). The end of the L-shaped fixing frame (35) is fixed to the mounting seat (1). A rear shift block (37) extends from the rear edge of the side of the shift frame (6), and the rear shift block (37) is attached to the rear end surface of the push frame (38). A front shift block (29) extends from the side of the shift frame (6), and the front shift block (29) is located in front of the rear shift block (37); The movable member comprises a threaded rod (31) mounted on the front part of the upper end of the mounting seat (1), a threaded ring (32) being screwed on the outer surface of the threaded rod (31), a propulsion seat (8) being fixedly mounted on the upper end of the threaded ring (32), two guide shells (26) being symmetrically fixedly mounted on the upper end of the propulsion seat (8), a guide block (27) being fittedly mounted inside the guide shell (26), the guide block (27) passing through the upper end of the guide shell (26), the end of the guide block (27) being fixed to the lower end of the V-shaped support seat (7), and the front end of the shifting frame (6) being fixed to the rear end of the propulsion seat (8); Lower brackets (18) are provided on both sides of the propulsion seat (8), a wheel frame (25) is fixedly mounted on the side of the guide block (27), a top wheel (24) is mounted on the end of the wheel frame (25), the top wheel (24) is attached to the upper end of the lower bracket (18), and the lower bracket (18) is connected to the mounting seat (1); A support plate (9) is fixedly mounted on the lower end of the lower bracket (18), and the lower end of the support plate (9) is fixed to the mounting seat (1). A lower inclined frame (19) is rotatably mounted on the rear end of the lower bracket (18). An upper inclined frame (22) is fitted on the outer side of the lower inclined frame (19), and an upper bracket (23) is rotatably mounted on the end of the upper inclined frame (22). A connecting seat (2) is arranged directly below the upper bracket (23), and the connecting seat (2) is fixed to the mounting seat (1). Two guide sleeves (12) are symmetrically fixedly mounted on the upper end of the connecting seat (2), and a guide rod (13) is fitted inside the guide sleeve (12). The guide rod (13) passes through the upper end of the guide sleeve (12), and the end of the guide rod (13) is fixed to the upper bracket (23).

2. A coiling machine reel unloading mechanism according to claim 1, characterized in that: The outer surface of the reel (4) is evenly distributed with a plurality of guide grooves (42), the expansion block (5) is fitted inside the guide groove (42), the front and rear end surfaces inside the guide groove (42) are both provided with a receiving groove (39), the front and rear ends of the expansion block (5) are both extended with lugs (40), the lugs (40) are fitted inside the receiving groove (39), a compression spring (41) is fixedly installed on the side of the lug (40), the end of the compression spring (41) is fixed to the inner side of the receiving groove (39), and the outer surface of the square expansion rod (10) is linearly arrayed with a plurality of sinking grooves (11), the edges of the sinking grooves (11) are inclined.

3. A coiling machine reel unloading mechanism according to claim 1, characterized in that: Supports (30) are rotatably mounted on both ends of the threaded rod (31); the lower ends of the supports (30) are fixed to the mounting seat (1); a slide seat (34) is fixedly mounted between the two supports (30); a concave slide block (33) extends from the lower end of the threaded ring (32); the concave slide block (33) is fitted to the outer surface of the slide seat (34); a servo motor (28) is fixedly mounted on the rear end of the threaded rod (31); the servo motor (28) is fixed on the mounting seat (1); and the servo motor (28) is located below the drive assembly (3).

4. A reel-up unloading mechanism for a reel-up machine according to claim 1, characterized in that: A threaded column (15) is fixedly installed at the middle of the upper end of the connecting seat (2), and the threaded column (15) is located between the two guide sleeves (12). A threaded sleeve (17) is screwed on the outer surface of the threaded column (15), and a connecting ring (16) is rotatably installed on the upper end of the threaded sleeve (17). A plurality of connecting columns (14) are fixedly installed in a circular array at the upper end of the connecting ring (16), and the ends of the connecting columns (14) are fixed to the upper bracket (23). Slide grooves (20) are penetrated on both sides of the upper inclined frame (22), and sliding ears (21) are extended on both sides of the lower inclined frame (19), and the sliding ears (21) are fitted inside the slide grooves (20).

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