Bag feeder for valve bag bagging

Abstract

The present invention relates to a bag supply device, in particular to a bag supply machine for bagging valve bags, comprising a bag warehouse, a bag suction device and a bag support device, the bag warehouse comprising a box body and a storage position, a cross wheel is arranged inside the box body, and the cross wheel is connected to the box body through a rotating shaft, and the storage position is arranged on the arm of the cross wheel, and the storage position is connected to the rotating shaft; the bag suction device comprises a fixed frame, a lifting cylinder, a suction cup and a propulsion cylinder, a propulsion slide rail is arranged on the fixed frame, the lifting cylinder is connected to the propulsion slide rail through a slide plate, and the lifting cylinder is connected to the suction cup through a connecting rod; the propulsion cylinder is arranged in parallel with the propulsion slide rail, one end of the propulsion cylinder is connected to the fixed frame, and the other end is connected to the slide plate through a propulsion rod; the bag support device comprises a bag support head and a transverse slide rail, and the bag support head is connected to the transverse slide rail through a fixed seat. Under the premise of ensuring normal operation, the present invention can directly perform bag replenishment operation without stopping the machine, thereby improving the continuity of mechanical operation and improving work efficiency.

Description

Technical Field

[0001] The invention relates to a bag supplying device, in particular to a bag supplying machine used for bagging valve bags. Background Art

[0002] Valve bags are currently widely used as filling and packaging bags, and are widely used for packaging powdered or granular solid materials and flexible items such as edible powder, chemical powder, fertilizer, synthetic materials, explosives, grain, salt, minerals, etc. Valve bags are fed from the top or bottom, and become square after filling, which is convenient for transportation and high filling efficiency.

[0003] Traditional valve bag supply is mainly done by manual cooperation with machinery or manual work alone, which is labor-intensive. In addition, manual bagging is easily restricted by the working environment and has low work efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a bag supply machine for valve bag bagging with high automation and high bag supply efficiency.

[0005] The present invention adopts the following technical solution:

[0006] A bag supply machine for valve bag bagging, comprising a bag storehouse, a bag suction device and a bag support device, wherein the bag suction device and the bag support device are connected to the bag storehouse through a supporting plate;

[0007] The bag storage includes a box body and storage positions. A cross wheel is arranged inside the box body, and the cross wheel is connected to the box body through a rotating shaft. The storage positions are arranged on the supporting arm of the cross wheel, and the storage positions are connected to the rotating shaft. One end of the rotating shaft is connected to the driving mechanism, and the other end is provided with a braking mechanism.

[0008] The bag suction device includes a fixed frame, a lifting cylinder, a suction cup and a propulsion cylinder. The fixed frame is provided with a propulsion slide rail. The lifting cylinder is connected to the propulsion slide rail through a slide plate, and the lifting cylinder is connected to the suction cup through a connecting rod. The propulsion cylinder is arranged in parallel with the propulsion slide rail. One end of the propulsion cylinder is connected to the fixed frame, and the other end is connected to the slide plate through a propulsion rod.

[0009] The bag holding device comprises a bag holding head and a transverse sliding rail, and the bag holding head is connected with the transverse sliding rail through a fixing seat.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The invention has a high degree of automation, greatly reduces the labor cost and improves work efficiency.

[0012] Further, the preferred embodiment adopted by the present invention is:

[0013] The cross wheels are symmetrically arranged at both ends of the rotating shaft, a storage position is installed between the support arms at relative positions of the two cross wheels, the side wall of the storage position is connected to the support arm through a fixed shaft, and a synchronous pulley is arranged at a position extending toward the outer side of the fixed shaft support arm, and the synchronous pulley is connected to the driving wheel arranged on the box body.

[0014] Limiting plates are respectively arranged at both ends of the bottom of the storage position, ribs are arranged between the limiting plates, and arc-shaped supporting plates are arranged on the ribs; and bag pressing rollers are arranged on the storage position.

[0015] A belt pressing wheel is arranged between the outer side of the wheel disc and the inner wall of the box body.

[0016] The driving mechanism includes an air motor, and one end of the rotating shaft is connected to the air motor; the braking mechanism includes a brake disc and a limit disc, and the other end of the rotating shaft is equipped with the brake disc and the limit disc, and a brake corresponding to the brake disc is arranged on the box body; a limit plate is arranged on the outer circle of the limit disc corresponding to the support arm of the cross wheel, and a travel switch corresponding to the limit plate is arranged on the box body.

[0017] Guide rods are respectively arranged on both sides of the lifting cylinder, the lower ends of the guide rods are connected through fixed blocks, the fixed blocks are connected to the vertical rods of the connecting rods, and a plurality of suction cups are arranged at intervals on the horizontal rods of the connecting rods.

[0018] The head of the bag supporting head is a duckbill structure, the tail of the bag supporting head is provided with a screw rod, and the tail of the bag supporting head is connected with a supporting frame on the fixing seat through a nut.

[0019] A notch is arranged at the edge of the arc-shaped support plate, an arc-shaped clamping ring is arranged in the notch, and the arc-shaped support plate is connected to the ribs through the arc-shaped clamping ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 A top view of

[0022] Figure 3 for Figure 1 Rear view of

[0023] Figure 4 This is the working principle diagram of the back-end storage location of the bag warehouse;

[0024] Figure 5 This is the working principle diagram of the front-end storage location of the bag warehouse;

[0025] Figure 6 It is a schematic diagram of the structure of the storage location;

[0026] Figure 7 for Figure 6 Bottom view of

[0027] Figure 8 is a structural schematic diagram of an arc-shaped support plate;

[0028] Fig. 9 for Figure 8 CC view;

[0029] Fig.10 It is a schematic diagram of the structure when the bag pressing roller is not lowered;

[0030] Fig.11 It is a schematic diagram of the structure of the bag suction device and the bag support device;

[0031] Fig.12 for Fig.11 Side view of

[0032] Fig.13 for Fig.11 A top view of

[0033] Fig.14 A schematic diagram of the structure of the robot used for bagging;

[0034] In the figure: box 1; pneumatic motor 2; support plate 3; cross tray 4; front cross wheel 4-1; front support arm 1 4-1-1; front support arm 2 4-1-2; front support arm 3 4-1-3; front support arm 4 4-1-4; rear cross wheel 4-2; rear support arm 1 4-2-1; rear support arm 2 4-2-2; rear support arm 3 4-2-3; rear support arm 4 4-2-4; storage location 5; storage location 1 5-1; storage location 2 5-2; storage location 3 5-3; storage location 4 5-4; fixed frame 6; push rail 7; guide rod 8; lifting slide 9; connecting rod 10; vertical rod 10-1; horizontal rod 10-2; suction cup 11; suction pipe 11-1; compression spring 11-2; transverse slide rail 12; bag support head 13; fixed seat 14; support frame 14- 1; bag pressing roller 15; bag pressing roller bracket 16; arc-shaped protrusion 16-1; synchronous belt 17; belt pressing wheel 18; propulsion cylinder 19; fixed plate 20; lifting cylinder 21; propulsion slider 22; pneumatic brake 23; brake disc 24; limit plate 25; limit plate 25-1; travel switch 26; driving wheel 27; front driving wheel 27-1; rear driving wheel 27-2; limit plate 28; rib 29; arc-shaped support plate 30; snap ring 31; height sensor 32; photoelectric sensor 33; light receiver 33-1; fixed block 34; slide plate 35; connecting plate 36; propulsion rod 37; rotating shaft 38; synchronous pulley 39; fixed shaft 40; bag pressing roller 41; reinforcement rod 42; diagonal support 43; programmer 44; reducer 45. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] A bag supply machine for valve bag bagging mainly consists of a bag warehouse, a bag suction device and a bag support device. The bag suction device and the bag support device are connected to a box body 1 through a U-shaped support plate 3. In order to make the connection between the support plate 3 and the box body 1 more firmly, a diagonal support 43 is added between the support plate 3 and the box body 1 for support.

[0037] The bag storage is mainly composed of a box body 1 and storage positions 5. A rotating shaft 38 penetrating the box body 1 is arranged between the front and rear side panels of the box body 1. A driving wheel 27 is respectively mounted on both ends of the rotating shaft 38 (the driving wheel at the front end of the box body 1 is the front driving wheel 27-1, and the driving wheel at the rear end of the box body 1 is the rear driving wheel 27-2). The two driving wheels 27 are respectively placed inside the box body 1 and are respectively fixedly connected to the inner wall of the box body 1 where they sit. A cross tray 4 is symmetrically mounted on both ends of the rotating shaft 38, that is, the front cross wheel disc 4-1 is placed at the front end of the box body 1, and the rear cross wheel disc 4-2 is placed at the rear end of the box body 1, and the two cross wheel discs 4 are symmetrically placed between the two driving wheels 27.

[0038] Each cross wheel 4 is provided with four arms (the arms of the front cross wheel 4-1 are respectively front arm 1 4-1-1, front arm 2 4-1-2, front arm 3 4-1-3 and front arm 4 4-1-4, and the arms of the rear cross wheel 4-2 are respectively rear arm 1 4-2-1, rear arm 2 4-2-2, rear arm 3 4-2-3 and rear arm 4 4-2-4). Storage positions 5 are respectively installed between the arms at symmetrical positions (i.e., storage position 1 5-1 is installed between the front arm 1 4-1-1 and the rear arm 1 4-2-1, storage position 2 5-2 is installed between the front arm 2 4-1-2 and the rear arm 2 4-2-2, storage position 3 5-3 is installed between the front arm 3 4-1-3 and the rear arm 3 4-2-3, and storage position 4 5-4 is installed between the front arm 4-1-4 and the rear arm 4 4-2-4).

[0039] The front and rear side plates of each storage position 5 are respectively provided with a fixed shaft 40, which is connected to the support arm on the corresponding side through a bearing, and the support arm is hinged to the storage position connected thereto. The fixed shaft 40 at the rear end of the storage position 1 5-1 and the storage position 2 5-2 extends to the outside of the support arm on the corresponding side, and a synchronous pulley 39 is installed at the extension end. Figure 4 As shown, the inner toothed side of the synchronous belt 17 passes through the synchronous pulley 39 on the outer side of the rear support arm 1 4-2-1, the rear drive wheel 27-2 and the synchronous pulley 39 on the outer side of the rear support arm 2 4-2-2 in sequence, and the outer non-toothed side of the synchronous belt 17 is pressed by the pressure wheel 18 provided on the rear cross wheel 4-2. Figure 5As shown, the fixed shafts 40 at the front ends of storage position three 5-3 and storage position four 5-4 extend to the outer sides of the support arms on their respective sides, and a synchronous pulley 39 is installed at the extended end of each fixed shaft 40. The toothed side of the inner periphery of the synchronous belt 17 passes through the synchronous pulley 39 on the outer side of the front support arm three 4-1-3, the front drive wheel 27-1 and the synchronous pulley 39 on the outer side of the front support arm four 4-1-4 in sequence, and the non-toothed side of the outer periphery of the synchronous belt 17 is tightened by the pressure pulley 18 arranged on the front cross pulley 4-1.

[0040] The storage position 5 is a shell structure with upper and lower openings. The two ends of the bottom of the storage position 5 are respectively provided with strip-shaped limit plates 28. A rib 29 is arranged between the two limit plates 28. An arc-shaped support plate 30 is arranged on the rib 29. A bag pressing roller bracket 16 is symmetrically arranged on the left and right sides of each storage position 5. The bag pressing roller brackets 16 are respectively hinged to the corresponding side walls of the storage position 5 by pins. A bag pressing roller 41 is arranged between the two bag pressing roller brackets 16. The bag pressing roller 15 is mounted on the bag pressing roller 41. The two ends of the bag pressing roller 41 are respectively bolted to the corresponding bag pressing roller brackets 16.

[0041] In order to make the two bag pressing roller brackets 16 more stable, a reinforcing rod 42 is installed between the bag pressing roller brackets 16 , and both ends of the reinforcing rod 42 are respectively welded to the corresponding bag pressing roller brackets 16 .

[0042] An arc-shaped protrusion 16-1 is provided on the bag pressing roller bracket 16. When the worker forgets to put down the bag pressing roller 15, the cross wheel 4 rotates, and the support arm falls along the tangent direction of the arc-shaped protrusion while squeezing the bag pressing roller bracket 16 close to the rotating shaft 38, causing the bag pressing roller bracket 16 to fall, so as to prevent damage to the production equipment due to the failure to put down the bag pressing roller 15 in time.

[0043] The arc surface of the arc support plate 30 protrudes upward, and a plurality of notches are arranged at intervals on the front and rear sides of the arc support plate 30 . An arc clamping ring 31 is correspondingly arranged in each notch, and the arc support plate 30 is connected to the rib 29 through the clamping ring 31 .

[0044] like Figure 1 , 3As shown, the rear end of the rotating shaft 38 is connected to the pneumatic motor 2 outside the box body 1 through the reducer 45; the front end of the rotating shaft 38 extends out of the box body 1, and the front end of the rotating shaft 38 is provided with a braking mechanism, which is composed of a brake disc 24 and a limit disc 25, etc. The brake disc 24 is fixedly connected to the rotating shaft 38, and the box body 1 is provided with a pneumatic brake 23 connected to the brake disc 24; the outer side of the brake disc 24 is provided with a limit disc 25, the limit disc 25 is sleeved on the rotating shaft 38 and the limit disc 25 is fixedly connected to the brake disc 24, and the outer circle of the limit disc 25 corresponds to the cross tray The support arm 4 is provided with a limit piece 25-1, and the limit piece 25-1 corresponds to the support arm one by one. A travel switch 26 is provided on the box body. When the limit piece 25-1 contacts the travel switch 26, the rotating shaft 38 stops rotating. In this embodiment, four limit pieces 25-1 are provided, and each limit piece 25-1 corresponds to a support arm. When the rotating shaft 38 rotates a quarter of a circle, the limit piece 25-1 contacts the travel switch 26, and the pneumatic brake 23 brakes. The pneumatic brake 23 stops rotating the rotating shaft 38 by controlling the brake disc 24, and the pneumatic motor 2 stops rotating at the same time.

[0045] The bag suction device is composed of a fixed frame 6, a lifting cylinder 21, a suction cup 11 and a propulsion cylinder 19. The bottom of the fixed frame 6 is fixed to the support plate 3 by bolts. A fixed plate 20 is arranged on the upper part of the fixed frame 6 along the axial direction parallel to the rotating shaft 38. A photoelectric sensor 33 is arranged at the end of the fixed plate 20 away from the fixed frame 6. A propulsion cylinder 19 is arranged on the right side of the fixed plate 20. The cylinder body of the propulsion cylinder 19 is fixed to the fixed frame 6. A propulsion rod 37 is fixedly installed on the piston rod of the propulsion cylinder 19. The middle part of the fixed plate 20 is set to a hollow structure. A propulsion slide rail 7 is installed on the left side of the fixed plate 20. The propulsion slide rail 7 is installed through the propulsion The slider 22 is connected to the slide plate 35, and the push rod 37 passes through the hollow structure of the fixed plate 20 and is fixedly connected to the right side of the slide plate 35; the cylinder body of the lifting cylinder 21 is fixedly installed on the left side of the slide plate 35, and the end of the piston rod of the lifting cylinder 21 is provided with a fixed block 34, and the guide rods 8 are symmetrically provided on both sides of the lifting cylinder 21. The bottom of the guide rod 8 is connected to the piston rod of the lifting cylinder 21 through the fixed block 34 to form a whole, and the middle part of the guide rod 8 is connected to the slide plate 35 through the lifting slider 9 respectively. The top of the two guide rods 8 forms a whole through the U-shaped connecting plate 36, and the guide rod 8 moves up and down with the piston rod of the lifting cylinder 21.

[0046] A connecting rod 10 is arranged below the fixed block 34, the vertical rod 10-1 of the connecting rod 10 is bolted to the fixed block 34, the cross bar 10-2 of the connecting rod 10 is bolted to the vertical rod 10-1, three suction cups 11 are arranged at intervals on the cross bar 10-2, the suction cup 11 is fixedly connected to the cross bar 10-2 through a suction pipe 11-1, the suction pipe 11-1 is connected to the suction cup cylinder, and a compression spring 11-2 is mounted on the suction pipe 11-1, and a height sensor 32 is installed at the right end of the cross bar 10-2, and the distance between the suction cup and the valve bag in the bag warehouse is collected by the height sensor 32 to determine the descent height.

[0047] The bag supporting device is composed of a bag supporting head 13 and a transverse slide rail 12. The transverse slide rail 12 is placed at the front end of the box body 1, and the transverse slide rail 12 is fixed to the support plate 3 by bolts. The transverse slide rail 12 is connected to the fixed seat 14 through a transverse slider fixedly installed on its surface. A support frame 14-1 is provided on the fixed seat 14, and a bag supporting head 13 is provided on the support frame 14-1. The right end of the bag supporting head 13 is a duckbill structure, and a screw is fixedly provided on the left end of the bag supporting head 13. The bag supporting head 13 is fixed to the support frame 14-1 by a nut.

[0048] When the device is used, a magnetic switch is provided on the propulsion cylinder 19. When the propulsion cylinder 19 pushes the slide plate 35 to the rear end of the propulsion slide rail 7, a signal is sent to the programmer 44. The programmer 44 sends a descending command, and the lifting cylinder 21 starts to descend. At the same time, the height sensor 32 collects height information (the height sensor 32 detects the distance from the upper surface of the uppermost valve pocket in the storage position 5) to determine the descending height of the lifting cylinder 21. When the piston rod of the lifting cylinder 21 descends to the specified position (that is, the suction cup contacts the uppermost valve pocket in the storage position 5), the suction cup 32 is moved to the uppermost valve pocket of the storage position 5. The upper surface of the bag), the lifting cylinder 21 stops descending, and the programmer 44 issues a bag suction command to control the suction cup 11 to suck the valve bag. At the same time, the lifting cylinder 21 rises, and the valve bag opens. The programmer 44 issues a lateral movement command to make the bag-holding head 13 slide to the right and insert it into the opening of the valve bag. The suction cup 11 returns to its initial position along the pushing slide rail 7, and then the robot clamps the bag, the bag-holding head 13 returns to its initial position, and the robot clamps the bag and moves upward to carry out the bagging work. At the same time, the bag suction device and the bag taking device continue to work in a cycle according to the above steps.

[0049] When the light receiving device 33-1 (such as Figure 6 , 7As shown, the light receiver 33-1 is installed on the limit plate 28 close to the side of the brake disc 24). When the receiving sensor of the photoelectric sensor 33 receives the light signal, there is no valve bag in the storage position 1 5-1. The programmer 44 controls the pneumatic motor 2 to rotate the rotating shaft 38. When the limit plate 25-1 on the outer circle of the limit disc 25 contacts the travel switch 26, the pneumatic brake 23 is started. Under the action of the pneumatic brake 23 and the brake disc 24, the rotating shaft 38 stops rotating, and the pneumatic motor stops working at the same time. At this time, the storage position 2 5-2 filled with valve bags just rotates to the bottom of the suction cup 11, and the storage position 2 5-2 starts to supply bags to the bag suction device. At the same time, the valve bags in the storage position 1 can be manually filled, and so on.

[0050] In this embodiment, the programmer 44 is connected to the air source processor, and the pneumatic motor 2, pneumatic brake 23, lifting cylinder 21, thrust cylinder 19 and suction cup cylinder are respectively connected to the air source processor. In order to make the gas in the air source processor more stable, a gas tank for stabilizing the air pressure is added between the air source processor and the electrical components.

[0051] In this embodiment, the electrical components are commercially available products. The pneumatic motor is a piston pneumatic motor of Oxu Machinery, model QMH050A-F200; the reducer is a turbine reducer, model RV90, brand Jiqiaoxing; the pneumatic brake model is DBF-L10-50; the air source processor model is RHE AF4000-04, brand Shanruis; the traverse slide model is LGB8-L-4, brand Qili Automation; the suction cup has a stroke of 155mm and a rod thickness of φ12 mm, suction cup contact surface φ32mm, brand is SMC; push rail model is LGB8-S-4, brand is Qili Automation; lifting cylinder model is MGCLB32-500R, brand is SMC; push cylinder model is MAL32x200-S-Ca, brand is SMC; photoelectric sensor model is E3F-R2NK, brand is Zhejiang Hugong; height sensor model is E3FA-DN13-NPN, brand is Zhongmlong; magnetic switch model is CS1-F, brand is AirTac.

[0052] Under the premise of ensuring normal operation, the present invention can directly fill bags to empty storage locations without stopping the machine, thereby improving the continuity of operations, reducing the labor intensity of workers, and improving work efficiency. In addition, the opening of the valve bag can be better opened with the help of the bag pressing roller 15.

[0053] The above are only specific implementations of the present invention, but the protection of the present invention is not limited to this. All equivalent changes or substitutions to the technical features of the technical solution that can be thought of by technicians in this technical field are included in the protection scope of the present invention.

Claims

1. A bag supply machine for valve bag bagging, comprising a bag store, a bag suction device and a bag support device, characterized in that: The bag suction device and the bag support device are connected to the bag warehouse through the support plate; The bag storage includes a box body and storage positions. A cross wheel is arranged inside the box body, and the cross wheel is connected to the box body through a rotating shaft. The storage positions are arranged on the supporting arm of the cross wheel, and the storage positions are connected to the rotating shaft. One end of the rotating shaft is connected to the driving mechanism, and the other end is provided with a braking mechanism. The bag suction device includes a fixed frame, a lifting cylinder, a suction cup and a propulsion cylinder. The fixed frame is provided with a propulsion slide rail. The lifting cylinder is connected to the propulsion slide rail through a slide plate, and the lifting cylinder is connected to the suction cup through a connecting rod. The propulsion cylinder is arranged in parallel with the propulsion slide rail. One end of the propulsion cylinder is connected to the fixed frame, and the other end is connected to the slide plate through a propulsion rod. The bag holding device comprises a bag holding head and a transverse sliding rail, and the bag holding head is connected to the transverse sliding rail through a fixed seat; The storage position is a shell structure with upper and lower openings. Limit plates are respectively arranged at both ends of the bottom of the storage position, ribs are arranged between the limit plates, and arc-shaped support plates are arranged on the ribs; a bag pressing roller bracket is symmetrically arranged on the left and right sides of each storage position, a bag pressing roller shaft is arranged between the two bag pressing roller brackets, and a bag pressing roller is mounted on the bag pressing roller shaft; an arc-shaped protrusion is arranged on the bag pressing roller bracket, and when the worker forgets to put down the bag pressing roller, the cross wheel rotates, and the support arm falls along the tangent direction of the arc-shaped protrusion while squeezing the bag pressing roller bracket close to the rotating shaft, so that the bag pressing roller bracket falls, so as to prevent the production equipment from being damaged due to the failure to put down the bag pressing roller in time; Guide rods are respectively arranged on both sides of the lifting cylinder, the lower ends of the guide rods are connected through fixed blocks, the fixed blocks are connected to the vertical rods of the connecting rods, and a plurality of suction cups are arranged at intervals on the horizontal rods of the connecting rods; The arc surface of the arc support plate protrudes upward, a notch is arranged at the edge of the arc support plate, an arc clamping ring is arranged in the notch, and the arc support plate is connected to the rib through the arc clamping ring.

2. The bag supply machine for valve bag bagging according to claim 1, characterized in that: The cross wheels are symmetrically arranged at both ends of the rotating shaft, a storage position is installed between the support arms at relative positions of the two cross wheels, the side wall of the storage position is connected to the support arm through a fixed shaft, and a synchronous pulley is arranged at a position extending toward the outer side of the fixed shaft support arm, and the synchronous pulley is connected to the driving wheel arranged on the box body.

3. The bag supply machine for valve bag bagging according to claim 1, characterized in that: A belt pressing wheel is arranged between the outer side of the wheel disc and the inner wall of the box body.

4. The bag supply machine for valve bag bagging according to claim 1, characterized in that: The driving mechanism includes an air motor, and one end of the rotating shaft is connected to the air motor; the braking mechanism includes a brake disc and a limit disc, and the other end of the rotating shaft is equipped with the brake disc and the limit disc, and a brake corresponding to the brake disc is arranged on the box body; a limit plate is arranged on the outer circle of the limit disc corresponding to the support arm of the cross wheel, and a travel switch corresponding to the limit plate is arranged on the box body.

5. The bag supply machine for valve bag bagging according to claim 1, characterized in that: The head of the bag supporting head is a duckbill structure, the tail of the bag supporting head is provided with a screw rod, and the tail of the bag supporting head is connected with a supporting frame on the fixing seat through a nut.

Images