Copper pipe fin connecting structure

Abstract

The invention discloses a copper pipe fin connecting structure, which relates to the technical field of fin installation, and comprises a copper pipe body and a fin body, two hoops are arranged outside the copper pipe body, the sides, opposite to the supporting rings, of the positioning rings make contact with the outer surface of the fin body, sliding blocks are slidably connected to the inner walls of the sliding bases, lead screws are in threaded connection with the inner walls of the threaded bases, and pressing plates are rotationally connected to the outer surfaces of the lead screws. Through cooperation of hoops, a positioning ring, a supporting ring, a lead screw, a pressing plate, a sliding base, a sliding block and a rotating shaft, after original fins of the copper pipe body are damaged, only the fins at the damaged position need to be cut and dismantled, the two hoops wrap the copper pipe body, and then the fins at the damaged position can be replaced; the replacement efficiency of the fins at the damaged position is improved, the maintenance time is shortened, meanwhile, a small number of fins are replaced, the fins which can be continuously used are reserved, and the cost for replacing the fins is saved.

Description

Technical Field

[0001] The invention relates to the technical field of fin installation, in particular to a copper tube fin connection structure. Background Art

[0002] The main function of the fin is to improve the heat transfer efficiency of the copper tube and increase the heat exchange area. The fin can significantly increase the surface area of ​​the copper tube, greatly increase the contact area between the hot fluid and the cold fluid, thereby improving the efficiency of heat transfer. The fin can also be used in the waste heat recovery system to make full use of the originally wasted heat and transfer it to the air, water or other media that need to be preheated, etc., to improve the comprehensive utilization rate of energy. The structural design of the fin helps to achieve uniform heating and avoid local overheating of the copper tube. It is crucial to prevent deformation and rupture of equipment caused by local overheating. It ensures the stability of the copper tube, keeps the temperature of the copper tube uniform, and extends the service life of the copper tube. While playing a role in heat dissipation, the fin can also play a certain supporting and reinforcing role on the copper tube, ensuring that the copper tube operates stably in a complex environment and improving the overall strength of the copper tube. The fin can also increase the structural strength of the copper tube, so that it can better withstand external pressure and impact, effectively absorb pressure and impact, and reduce the damage to the copper tube caused by pressure and impact.

[0003] The existing fins are mostly connected to copper tubes in the following ways; direct welding: suitable for occasions with high requirements on connection tightness. By directly welding the fin tube and the copper tube, the energy loss caused by the gap at the connection can be effectively avoided, and the overall strength and stability can be improved, and the service life can be increased. Spot welding: suitable for some occasions where the welding strength requirements are not particularly high, such as some small fins and copper tubes. The fins and heat exchange tubes are connected together by spot welding, which is relatively simple to operate and low in cost. Threaded connection: It has the advantages of easy installation and low cost. It is suitable for occasions with low requirements on connection accuracy, such as the connection between fins and copper tubes in some low-pressure systems. However, when subjected to large pressure or temperature changes, looseness or leakage may occur, which requires regular inspection and maintenance. Winding: The winding methods are mainly divided into welding and extrusion. The fins are wrapped around the outside of the copper tube and connected to the copper tube by welding or mechanical extrusion.

[0004] When the fin is damaged, it is usually necessary to dismantle all the fins outside the copper tube and replace the fins. Because of the local fin damage, all the fins outside the copper tube need to be removed, which increases the workload of the maintenance personnel. While disassembling the fins, the fins may also be damaged. At the same time, the undamaged fins can continue to be used, resulting in a waste of fins. For this reason, we propose a copper tube fin connection structure. Summary of the invention

[0005] The object of the present invention is to provide a copper tube fin connection structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: A copper tube fin connection structure, comprising: a copper tube body and a fin body; two hoop fasteners are arranged outside the copper tube body, and the two hoop fasteners are symmetrical. Support rings are connected to the outer surfaces of the two hoop fasteners. Positioning rings are arranged outside the two hoop fasteners. The side of the positioning ring opposite to the support ring is in contact with the outer surface of the fin body. One end of one of the hoop fasteners is connected to a sliding seat. A slider is slidably connected to the inner wall of the sliding seat. A first spring is arranged inside the sliding seat. One end of the other hoop fastener is connected to a rotating shaft. The end of the rotating shaft is rotatably connected to the inner wall of the slider. One end of the other hoop fastener is rotatably connected to a support shaft. One end of the support shaft is connected to a threaded seat. A lead screw is threadedly connected to the inner wall of the threaded seat. The top of the lead screw is connected to a hexagonal head. The outer surface of the lead screw is rotatably connected to a pressing plate. A positioning mechanism is arranged above the pressing plate. A clamping groove is formed at the other end of the other hoop fastener, and the lead screw is located inside the clamping groove.

[0007] Preferably, a positioning groove is formed inside the other hoop fastener at one end of the clamping groove, and the pressing plate is located inside the positioning groove.

[0008] Preferably, a relay ring is connected to the outer surface of the lead screw, and one side of the relay ring is in contact with the upper surface of the pressing plate.

[0009] Preferably, the positioning mechanism is a first gear disc. One side of the first gear disc is connected to the lower surface of the hexagonal head, and the other side of the first gear disc is in contact with a second gear disc.

[0010] Preferably, four guide rods are slidably connected to the inner wall of the pressing plate, and the four guide rods are arranged in an equilateral quadrilateral array. One end of the guide rod is connected to the other side of the second gear disc, and the other end of the guide rod is connected to a limiting block.

[0011] Preferably, a second spring is sleeved outside the guide rod. One end of the second spring is connected to one side of the pressing plate, and the other end of the second spring is connected to the other side of the second gear disc.

[0012] Preferably, a plurality of receiving grooves are formed inside the fin body, and the plurality of receiving grooves are arranged in an arc array.

[0013] Preferably, a plurality of locking bolts equal in number to the receiving grooves are rotatably connected to the inner wall of the positioning ring. The plurality of locking bolts penetrate through the receiving grooves and are threadedly connected to the inner wall of the support ring.

[0014] Preferably, the number of the sliding seats is two, and the two sliding seats are symmetrical. Positioning sliding grooves are formed in the inner sides of the two sliding seats. A positioning sliding rail is connected to the outer surface of the slider, and the outer surface of the positioning sliding rail is slidably connected to the inner wall of the positioning sliding groove.

[0015] Preferably, support pins are connected to the inner top walls of the sliding seats and the upper surfaces of the sliders. The first springs are sleeved on the outer sides of the support pins. One end of each first spring is connected to the inner top wall of the corresponding sliding seat, and the other end of each first spring is connected to the upper surface of the corresponding slider.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Through the cooperation among the hoop, the positioning ring, the support ring, the screw rod, the pressing plate, the sliding seat, the slider and the rotating shaft, the copper tube body is clamped and fixed by the two hoops. The screw rod is supported by the threaded seat. After the screw rod rotates, the distance between the two hoops is reduced. After the two hoops are contracted, they tightly wrap around the outer part of the copper tube body. The two hoops provide support for the fin body. By tightening the locking bolt to reduce the distance between the positioning ring and the support ring, the fin body is tightly clamped inside to maintain the stability of the fin body. The sliding seat provides support for the slider, and the slider provides support for the rotating shaft to maintain the stability of the rotating shaft during rotation. The hoops are flipped through the rotating shaft, which is convenient for the hoops to be flipped and combined together. After the original fins on the copper tube body are damaged, only the damaged fins at the damaged position need to be cut and removed. By wrapping the two hoops around the outer part of the copper tube body, the damaged fins at the damaged position can be replaced without removing all the fins outside the copper tube body, improving the replacement efficiency of the damaged fins, reducing the maintenance time, and at the same time replacing a small number of fins and retaining the fins that can still be used, saving the cost of replacing the fins.

[0018] 2. Through the cooperation between the hoop and the fin body, the copper tube body is clamped and fixed by the hoop. The fin body increases the contact area with the copper tube body through the hoop, increases the heat release amount from the copper tube body to the fin body, and improves the heat dissipation efficiency of the finned copper tube body.

[0019] III. The copper tube fin connection structure of the present invention realizes the cooperation among the support ring, the positioning ring and the locking bolt. The rotation of the locking bolt provides power for the movement of the positioning ring, and the movement of the positioning ring realizes the fixation and contact fixation limitation of the fin. After the fin body is damaged, the fin can be taken out from the inside of the fixing ring and the support ring by rotating the locking bolt, and then a new fin body is inserted into the inside of the positioning ring and the support ring, and then the fin body is fixed. After a single fin body is damaged, it is not necessary to replace all components, but only the fin body needs to be replaced, which is convenient for later replacement and maintenance of the fin body, and at the same time reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the overall structure of the hoop of the present invention;

[0022] Figure 3 is a schematic diagram of the structures of the support ring and the positioning ring of the present invention;

[0023] Figure 4 is a schematic diagram of the internal structure of the hoop of the present invention;

[0024] Figure 5 is a schematic diagram of the internal structure of the sliding seat of the present invention in section;

[0025] Figure 6 is a schematic diagram of the overall three-dimensional structure of the positioning mechanism of the present invention;

[0026] Figure 7 is a schematic diagram of the overall three-dimensional structure of the fin body of the present invention.

[0027] In the figure: 1, copper tube body; 2, fin body; 3, hoop; 4, support ring; 5, positioning ring; 6, sliding seat; 7, slider; 8, first spring; 9, rotating shaft; 10, support shaft; 11, threaded seat; 12, lead screw; 13, hexagonal head; 14, pressing plate; 15, positioning mechanism; 1501, first toothed disc; 1502, second toothed disc; 1503, guide rod; 1504, limiting block; 1505, second spring; 16, card slot; 17, positioning slot; 18, relay ring; 19, receiving groove; 20, locking bolt; 21, positioning chute; 22, positioning slide rail; 23, support pin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1

[0030] Please refer to Figures 1 - 7 , a copper tube fin connection structure in the figure, including: a copper tube body 1 and a fin body 2; two hoop fasteners 3 are arranged outside the copper tube body 1, and the two hoop fasteners 3 are symmetrical. The appearance of the hoop fastener 3 is semi-circular arc-shaped, and the inside is a semi-circular arc groove. By combining the two hoop fasteners 3 together, the copper tube body 1 is clamped inside to provide a supporting force for the fin body 2 and maintain the stability of the fin body 2.

[0031] Another hoop fastener 3 is provided with a positioning groove 17 at one end inside the card slot 16. The pressing plate 14 is located inside the positioning groove 17. When the screw rod 12 rotates, to prevent the rotation of the screw rod 12 from driving the pressing plate 14 to rotate simultaneously, the pressing plate 14 is wrapped by the positioning groove 17, and the pressing plate 14 is tightly wrapped inside to limit the rotation of the pressing plate 14, thereby maintaining the stability of the pressing plate 14. By moving the position of the pressing plate 14, the distance between the two clamps is reduced, so that the two clamps tightly wrap around the outside of the copper tube body 1. A relay ring 18 is connected to the outer surface of the screw rod 12, and one side of the relay ring 18 is in contact with the upper surface of the pressing plate 14. The relay ring 18 provides a supporting force for the pressing plate 14. When the screw rod 12 rotates and moves downward, the screw rod 12 transmits the driving force to the pressing plate 14 through the relay ring 18, driving the pressing plate 14 to move downward simultaneously.

[0032] Support rings 4 are connected to the outer surfaces of the two hoop fasteners 3, and positioning rings 5 are arranged outside the two hoop fasteners 3. The side of the positioning ring 5 opposite to the support ring 4 is in contact with the outer surface of the fin body 2. The support ring 4 provides a supporting force for one side of the fin body 2. By reducing the distance between the positioning ring 5 and the support ring 4, the fin body 2 is clamped between the support ring 4 and the positioning ring 5 to maintain the stability of the fin body 2.

[0033] One end of one of the hoop clamps 3 is connected with a sliding seat 6. A slider 7 is slidably connected to the inner wall of the sliding seat 6. A first spring 8 is arranged inside the sliding seat 6. One end of the other hoop clamp 3 is connected with a rotating shaft 9. The end of the rotating shaft 9 is rotatably connected to the inner wall of the slider 7. The sliding seat 6 provides a supporting force and a guiding for the moving position of the slider 7 to maintain the stability of the slider 7 when it moves. The slider 7 provides support for the rotating shaft 9 to maintain the stability of the rotating shaft 9. The first spring 8 provides an elastic driving force for the slider 7. After the two hoop clamps 3 wrap the copper pipe body 1, the first spring 8 pushes the slider 7 to move downward, so that the two hoop clamps 3 tightly apply a clamping force to the copper pipe body 1 and maintain the stability of the two hoop clamps 3.

[0034] The other end of one of the hoop clamps 3 is rotatably connected with a support shaft 10. One end of the support shaft 10 is connected with a threaded seat 11. A lead screw 12 is threadedly connected to the inner wall of the threaded seat 11. The top end of the lead screw 12 is connected with a hexagonal head 13. A pressing plate 14 is rotatably connected to the outer surface of the lead screw 12. A clamping groove 16 is formed in the other end of the other hoop clamp 3, and the lead screw 12 is located inside the clamping groove 16. The support shaft 10 provides a supporting force for the threaded seat 11 to maintain the stability of the threaded seat 11. The hoop clamp 3 reserves space for the lead screw 12 through the clamping groove 16. The pressing plate 14 provides a supporting force for the lead screw 12. By rotating the lead screw 12, the pressing plate 14 is pushed to move. While the pressing plate 14 moves, the two hoop clamps 3 contract with each other. By contacting the hexagonal head 13 with a hexagonal wrench, it is convenient to rotate the lead screw 12. The inside of the hexagonal head 13 is an internal hexagonal groove.

[0035] Above the pressing plate 14, a positioning mechanism 15 is provided. When the copper tube body 1 conveys the medium, the copper tube body 1 itself may vibrate, and the vibration may cause the lead screw 12 to rotate on its own. After the lead screw 12 rotates on its own, the positioning restriction on the pressing plate 14 will be lost, and finally the two clamps will become loose. The positioning mechanism 15 maintains the stability of the lead screw 12 and prevents the lead screw 12 from rotating on its own. The positioning mechanism 15 includes a first gear disk 1501. One side of the first gear disk 1501 is connected to the lower surface of the hexagonal head 13, and the other side of the first gear disk 1501 is in contact with a second gear disk 1502. The outer parts of the first gear disk 1501 and the second gear disk 1502 both have helical teeth. Through the misaligned contact of the helical teeth on the first gear disk 1501 and the second gear disk 1502, resistance is provided to each other. Four guide rods 1503 are slidably connected to the inner wall of the pressing plate 14, and the four guide rods 1503 are arranged in an equilateral quadrilateral array. One end of the guide rod 1503 is connected to the other side of the second gear disk 1502, and the other end of the guide rod 1503 is connected with a limiting block 1504. The guide rod 1503 provides a supporting force for the second gear disk 1502 to maintain the stability of the second gear disk 1502, so that the second gear disk 1502 can more stably provide a supporting force for the first gear disk 1501 and prevent the second gear disk 1502 from shaking. The maximum moving distance of the guide rod 1503 is limited by the limiting block 1504 to prevent the guide rod 1503 from disengaging from contact with the pressing plate 14. A second spring 1505 is sleeved on the outside of the guide rod 1503. One end of the second spring 1505 is connected to one side of the pressing plate 14, and the other end of the second spring 1505 is connected to the other side of the second gear disk 1502. The second spring 1505 plays a supporting role inside through the guide rod 1503 to prevent the second spring 1505 from deforming when elastically contracting and disengaging from contact with the pressing plate 14 and the second gear disk 1502. The stability of the second spring 1505 is maintained inside through the guide rod 1503. The second spring 1505 provides an elastic driving force for the second gear disk 1502 to push the second gear disk 1502 to tightly maintain contact with the first gear disk 1501, so that the second gear disk 1502 can more stably provide resistance for the first gear disk 1501.

[0036] A plurality of receiving grooves 19 are formed on the inner side of the fin body 2, and the plurality of receiving grooves 19 are arranged in an arc array. The fin body 2 reserves space for the locking bolts 20 to pass through through the receiving grooves 19, which is convenient for the locking bolts 20 to pass through the fin body 2. A plurality of locking bolts 20 with the same number as the receiving grooves 19 are rotatably connected to the inner wall of the positioning ring 5. The plurality of locking bolts 20 penetrate through the receiving grooves 19 and are threadedly connected to the inner wall of the support ring 4. By rotating and contracting the locking bolts 20, the distance between the positioning ring 5 and the support ring 4 is reduced. After the positioning ring 5 and the support ring 4 are contracted, the fin body 2 is tightly clamped inside to maintain the stability of the fin body 2.

[0037] There are two sliding seats 6, and the two sliding seats 6 are symmetrical. Positioning sliding grooves 21 are provided on the inner sides of the two sliding seats 6. A positioning sliding rail 22 is connected to the outer surface of the slider 7, and the outer surface of the positioning sliding rail 22 is slidably connected to the inner wall of the positioning sliding groove 21. The positioning sliding groove 21 provides force and moving position guidance for the positioning guide rail to maintain the stability of the positioning guide rail when moving. The slider 7 receives the supporting force of the positioning sliding groove 21 through the positioning guide rail to maintain the stability of the slider 7 when moving up and down. Support pins 23 are connected to the inner top wall of the sliding seat 6 and the upper surface of the slider 7. The first spring 8 is sleeved outside the support pin 23. One end of the first spring 8 is connected to the inner top wall of the sliding seat 6, and the other end of the first spring 8 is connected to the upper surface of the slider 7. The first spring 8 provides an elastic supporting force for the slider 7 to push the slider 7 to move downward. When the first spring 8 elastically contracts, deformation may occur. The two support pins 23 play a supporting role inside both ends of the first spring 8 to prevent the first spring 8 from deforming too much and detaching from contact with the slider 7. The stability of the first spring 8 is maintained through the support of the two positioning pins.

[0038] In this solution: A copper tube fin connection structure includes the following steps: First, place the fin body 2 in the middle position between the support ring 4 and the positioning ring 5. Then rotate the locking bolt 20. After the locking bolt 20 rotates, it drives the positioning ring 5 to move towards the support ring 4. Then the positioning ring 5 pushes the fin body 2 to keep in close contact with the support ring 4. Then wrap the hoop 3 around the outside of the copper tube body 1. Then flip the lead screw 12. While the lead screw 12 flips, it drives the threaded seat 11 and the pressing plate 14 to flip simultaneously. Then rotate the lead screw 12 through the hexagon head 13. After the lead screw 12 rotates, it pushes the pressing plate 14 to move downward through the relay ring 18. Then the pressing plate 14 enters the positioning groove 17. Continue to rotate the lead screw 12 until the two hoops 3 tightly clamp the outside of the copper tube body 1. While the hexagon head 13 drives the lead screw 12 to rotate, the hexagon head 13 drives the first tooth disc 1501 to rotate simultaneously. When the highest point of the first tooth disc 1501 contacts the highest point of the second tooth disc 1502 during rotation, the first tooth disc 1501 pushes the second tooth disc 1502 to move downward. While the second tooth disc 1502 moves downward, it compresses the second spring 1505. When the first tooth disc 1501 rotates to the lowest point and contacts the lowest point of the second tooth disc 1502, the second spring 1505 pushes the second tooth disc 1502 to move upward. After the hexagon head 13 stops rotating, the second spring 1505 pushes the second tooth disc 1502 to tightly contact the first tooth disc 1501. While the two hoops 3 contract with each other, the first spring 8 provides an elastic driving force for the slider 7 to push the slider 7 to move downward. While the slider 7 moves downward, it drives the other ends of the two hoops 3 to contract together, further improving the clamping force of the two hoops 3 on the copper tube body 1 and further improving the stability of the fin body 2.

[0039] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A copper tube fin connection structure, comprising: A copper tube body (1) and a fin body (2); characterized in that two hoops (3) are arranged outside the copper tube body (1), and the two hoops (3) are symmetrical, the outer surfaces of the two hoops (3) are connected to support rings (4), the outer surfaces of the two hoops (3) are arranged to have positioning rings (5), the side of the positioning ring (5) opposite to the support ring (4) is in contact with the outer surface of the fin body (2), one end of one of the hoops (3) is connected to a sliding seat (6), the inner wall of the sliding seat (6) is slidably connected to a slider (7), the interior of the sliding seat (6) is provided with a first spring (8), one end of the other hoops (3) is connected to a A rotating shaft (9) is provided, the end of which is rotatably connected to the inner wall of the slider (7); the other end of one of the clamps (3) is rotatably connected to a support shaft (10); one end of the support shaft (10) is connected to a threaded seat (11); the inner wall of the threaded seat (11) is threadedly connected to a screw rod (12); the top of the screw rod (12) is connected to a hexagonal head (13); the outer surface of the screw rod (12) is rotatably connected to a pressure plate (14); a positioning mechanism (15) is provided above the pressure plate (14); a slot (16) is provided at the other end of the other clamp (3), and the screw rod (12) is located inside the slot (16).

2. A copper tube fin connection structure according to claim 1, characterized in that: A positioning groove (17) is provided on the inner side of one end of the other clamping hoop (3) located in the clamping groove (16), and the pressing plate (14) is located inside the positioning groove (17).

3. A copper tube fin connection structure according to claim 2, characterized in that: The outer surface of the screw rod (12) is connected to a relay ring (18), and one side of the relay ring (18) is in contact with the upper surface of the pressing plate (14).

4. A copper tube fin connection structure according to claim 1, characterized in that: The positioning mechanism (15) comprises a first toothed disc (1501), one side of which is connected to the lower surface of the hexagonal head (13), and the other side of which is in contact with a second toothed disc (1502).

5. A copper tube fin connection structure according to claim 4, characterized in that: The inner wall of the pressure plate (14) is slidably connected to four guide rods (1503), and the four guide rods (1503) are arranged in an equilateral quadrilateral array, one end of the guide rod (1503) is connected to the other side of the second toothed disc (1502), and the other end of the guide rod (1503) is connected to a limiting block (1504).

6. A copper tube fin connection structure according to claim 5, characterized in that: The guide rod (1503) is externally sleeved with a second spring (1505), one end of the second spring (1505) is connected to one side of the pressure plate (14), and the other end of the second spring (1505) is connected to the other side of the second toothed disc (1502).

7. A copper tube fin connection structure according to claim 1, characterized in that: A plurality of accommodating grooves (19) are provided on the inner side of the fin body (2), and the plurality of accommodating grooves (19) are arranged in an arc-shaped array.

8. A copper tube fin connection structure according to claim 7, characterized in that: The inner wall of the positioning ring (5) is rotatably connected with a plurality of locking bolts (20) having the same number as the receiving grooves (19); the plurality of locking bolts (20) penetrate the receiving grooves (19) and are threadedly connected to the inner wall of the support ring (4).

9. The copper tube fin connection structure according to claim 1, characterized in that: There are two slide seats (6), and the two slide seats (6) are symmetrical. The inner sides of the two slide seats (6) are each provided with a positioning slide groove (21). The outer surface of the slider (7) is connected with a positioning slide rail (22), and the outer surface of the positioning slide rail (22) is slidably connected to the inner wall of the positioning slide groove (21).

10. A copper tube fin connection structure according to claim 7, characterized in that: The inner top wall of the slide seat (6) and the upper surface of the slider (7) are both connected with a support pin (23); the first spring (8) is sleeved on the outside of the support pin (23); one end of the first spring (8) is connected to the inner top wall of the slide seat (6); and the other end of the first spring (8) is connected to the upper surface of the slider (7).

Images