End machining device for PE water supply pipe production

Abstract

The end machining device for PE water supply pipe production comprises a workbench, a fixing base with a notch formed in the top is fixed to the workbench, and abutting plates which can be close to each other are arranged on the two faces of the inner side of the fixing base; a lifting plate capable of ascending and descending is arranged at the top of the workbench, a cylinder capable of moving towards the fixing base is arranged on the lifting plate, a set of connecting plates distributed in an annular array mode are arranged in the cylinder, the set of connecting plates can evenly get close to or get away from the axis of the cylinder, and the ends, close to the fixing base, of the connecting plates are located outside the cylinder and detachably connected with scraping workpieces. The scraping workpiece comprises a first scraping knife with the top and the bottom provided with cutting edges. And a motor for driving the cylinder to rotate is arranged on the lifting plate. According to actual requirements, the outer skin or the inner wall of the PE water supply pipe can be scraped, so that when the PE water supply pipe is arranged on another pipeline in a sleeving mode, the connection firmness of the PE water supply pipe and the other pipeline is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of processing devices, and particularly to an end processing device for the production of PE water supply pipes. Background Art

[0002] Polyethylene (PE) water supply pipes have been widely used in water supply projects due to their excellent corrosion resistance, good flexibility, and long service life. However, despite their many advantages, PE pipes still face some challenges in practical applications, especially in terms of the sealing performance and connection strength at pipe joints. When laying PE water supply pipes, both ends usually need to be connected to other pipes or fittings. To ensure the sealing performance and connection strength at the joints, effective measures must be taken to improve the adhesion between the connection materials (such as glue, hot melt adhesive, etc.) and the pipe material. Traditional connection methods sometimes struggle to meet the high standards of engineering requirements, especially in harsh underground environments, where leaks or breaks are likely to occur at the joints, affecting the safety and stability of the entire pipe system.

[0003] For example, the invention patent with the Chinese patent application number: CN202411593053.9 discloses a batch processing device for the production of PE water supply pipes, including a first base. A guide plate is connected to the right side of the first base. A second base is provided on the right side of the first base. A guide groove for guiding the guide plate is provided at the bottom of the second base. Lifting supports for supporting the pipe are provided on both the first base and the second base. An electric slide rail is installed on the top of the first base. A push plate for pushing the pipe is connected to the slider of the electric slide rail. A mounting seat is connected to the upper right side of the second base, and a scraping mechanism is provided on the mounting seat. The lifting support can support the PE water supply pipe, the inner support clamp can support and clamp the PE water supply pipe, and through the cooperation of the motor and the gear, the hollow rotating shaft can be driven to drive the scraping knife to rotate along the PE water supply pipe, removing the outer skin of the end of the PE water supply pipe. It has a high degree of automation and stable processing quality, is suitable for large-scale scraping of the outer skin of PE pipes, and improves the processing efficiency.

[0004] Although the above device can scrape the outer skin of the water pipe, when the water pipe needs to be sleeved on another pipe, it cannot scrape the inner wall of the water pipe, and there are still certain limitations. Summary of the Invention

[0005] The present invention discloses an end processing device for the production of PE water supply pipes, which solves the problem that the inner wall of the water pipe cannot be scraped.

[0006] To solve the above technical problems, the present invention specifically adopts the following technical solutions:

[0007] An end processing device for the production of PE water supply pipes, comprising a workbench, on which a fixed seat with a notch at the top is fixed, and on both sides inside the fixed seat, there are abutting plates that can approach each other; on the top of the workbench, there is a liftable lifting plate, on the lifting plate, there is a cylinder that can move towards the fixed seat, inside the cylinder, there is a group of connecting plates distributed in an annular array, and the group of connecting plates can uniformly approach or move away from the axis of the cylinder. One end of the connecting plate close to the fixed seat is located outside the cylinder and is detachably connected with a scraping workpiece. The scraping workpiece includes a first scraping knife with blades at both the top and the bottom; on the lifting plate, there is a motor for driving the cylinder to rotate.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] After placing the PE water supply pipe in the notch of the fixed seat, make the two abutting plates approach each other to complete the fixation of the PE water supply pipe; when it is necessary to scrape the outer surface of the PE water supply pipe, according to the diameter of the PE water supply pipe, make the group of connecting plates approach or move away from the axis of the cylinder, adjust the position of the group of first scraping knives, and then make the cylinder move towards the PE water supply pipe. When the blade of the first scraping knife close to the axis of the cylinder contacts the end of the PE water supply pipe, as the cylinder continues to move, the first scraping knife can scrape a groove with an appropriate depth on the outer surface of the end of the PE water supply pipe; then the cylinder returns to its original position to separate the first scraping knife from the PE water supply pipe, the motor drives the cylinder to rotate, after changing the position of the group of first scraping knives, then make the first scraping knife move towards the PE water supply pipe, and it can continue to expand the range of the groove closely along the groove previously opened on the PE water supply pipe. After repeating the above operations several times, the scraping operation of the outer skin of the end of the PE water supply pipe can be completed; when it is necessary to scrape the inner wall of the PE water supply pipe, after making the group of connecting plates move towards the axis of the cylinder, make the blade of the group of first scraping knives away from the axis of the cylinder correspond to the inner wall of the PE water supply pipe, that is, the above operation of making the cylinder move repeatedly can be repeated to complete the scraping operation of the inner wall of the PE water supply pipe; when processing PE water supply pipes of different models, the lifting plate can be moved up or down so that the axis of the cylinder can correspond to the axis of the PE water supply pipe; the present invention can scrape the outer skin or the inner wall of the PE water supply pipe according to actual needs, so as to increase the firmness of the connection between the two when the PE water supply pipe is sleeved on another pipe. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of the front view of the present invention;

[0011] Figure 2 is Figure 1 the enlarged structural diagram at A of

[0012] Figure 3 It is a schematic cross-sectional view of the cylinder of the present invention;

[0013] Figure 4 This is a schematic structural diagram of the first scraping tool of the present invention viewed from below.

[0014] Figure 5 This is a schematic structural diagram of the second scraping tool of the present invention viewed from below.

[0015] Figure 6 This is a schematic structural diagram of the fixed seat of the present invention viewed from the side.

[0016] Figure 7 This is a schematic structural diagram of the connecting frame of the present invention viewed from the side.

[0017] In the figure: 1, workbench; 2, fixed seat; 21, abutting plate; 22, third automatic telescopic rod; 23, rubber pad; 3, lifting plate; 31, motor; 32, hydraulic rod; 33, vertical plate; 34, disc; 35, connecting rod; 36, second automatic telescopic rod; 37, rubber cone; 38, moving plate; 39, first automatic telescopic rod; 4, cylinder; 41, connecting plate; 42, spring; 43, fixed block; 44, connecting head; 45, moving ring; 46, first electric telescopic rod; 47, fixed rod; 48, first storage battery; 5, first scraping tool; 6, fixing plate; 61, connecting strip; 7, L-shaped plate; 71, moving block; 72, lead screw; 73, second electric telescopic rod; 74, cross plate; 75, connecting frame; 76, third electric telescopic rod; 77, pressing plate; 78, second storage battery; 8, second scraping tool; 9, PE water supply pipe. Specific embodiments

[0018] The following will specifically describe the content of the present invention in conjunction with the accompanying drawings and embodiments.

[0019] Such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As shown in the figure, the present invention provides an end processing device for the production of PE water supply pipes, including a workbench 1, on which a fixed seat 2 with a notch at the top is fixed. On both sides inside the fixed seat 2, there are abutting plates 21 that can approach each other; on the top of the workbench 1, there is a liftable lifting plate 3. On the lifting plate 3, there is a cylinder 4 that can move towards the fixed seat 2. Inside the cylinder 4, there is a group of connecting plates 41 distributed in a circular array. The group of connecting plates 41 can uniformly approach or move away from the axis of the cylinder 4. One end of the connecting plate 41 close to the fixed seat 2 is located outside the cylinder 4 and is detachably connected with a scraping workpiece. The scraping workpiece includes a first scraping knife 5 with blades at both the top and the bottom; on the lifting plate 3, there is a motor 31 for driving the cylinder 4 to rotate.The number of a set of connecting plates 41 is at least four, and the number of connecting plates 41 can be increased according to the actual situation to facilitate the scraping operation on the PE water supply pipe 9; the number of fixing seats 2 is at least two, and the two fixing seats 2 are symmetrically distributed left and right to more stably support the PE water supply pipe 9; after placing the PE water supply pipe 9 in the notch of the fixing seat 2, make the two abutting plates 21 approach each other. After clamping and fixing the PE water supply pipe 9, a set of connecting plates 41 can be made to approach or move away from the axis of the cylinder 4, adjust the position of the blade of the first scraping knife 5 close to the axis of the cylinder 4 so that the blade of the first scraping knife 5 close to the axis of the cylinder 4 corresponds to the outer surface of the end of the PE water supply pipe 9; then make the cylinder 4 move towards the fixing seat 2. When the blade of the first scraping knife 5 close to the axis of the cylinder 4 contacts the end of the PE water supply pipe 9, as the cylinder 4 continues to move, the first scraping knife 5 can cut a groove with a suitable depth on the outer surface of the PE water supply pipe 9; then the cylinder 4 is restored to separate the first scraping knife 5 from the PE water supply pipe 9, and then start the motor 31 to drive the cylinder 4 to rotate. After changing the position of the first scraping knife 5 and repeating the above operation to make the cylinder 4 move, the first scraping knife 5 can cut another groove connected to the previous groove on the outer surface of the PE water supply pipe 9 to expand the distance of the groove. Repeating the above operation repeatedly can complete the scraping operation on the outer surface of the PE water supply pipe 9; when the inner wall of the PE water supply pipe 9 needs to be scraped, make a set of connecting plates 41 approach or move away from the axis of the cylinder 4. After making the blade of the first scraping knife 5 far from the axis of the cylinder 4 correspond to the inner wall of the PE water supply pipe 9, make the cylinder 4 move towards the fixing seat 2. After the first scraping knife 5 enters the PE water supply pipe 9, the blade of the first scraping knife 5 close to the axis of the cylinder 4 can cut a groove on the inner wall of the PE water supply pipe 9. Subsequently, the same operation as when cutting the groove on the outer surface of the PE water supply pipe 9 is repeated, making the cylinder 4 approach or move away from the PE water supply pipe 9 repeatedly, and by changing the position of the first scraping knife 5, the grooving operation on the inner wall of the PE water supply pipe 9 is completed; by making a set of first scraping knives 5 approach or move away from the axis of the cylinder 4, and then through the lifting of the lifting plate 3, the axis of the cylinder 4 is always made to correspond to the axis of the PE water supply pipe 9 to facilitate the scraping operation on the inner wall or outer surface of different PE water supply pipes 9.

[0020] Such as Figure 1 , Figure 2 and Figure 3As shown, a spring 42 is fixed between the connecting plate 41 and the inner wall of the cylinder 4. A fixed block 43 with an inclined surface is fixed on the connecting plate 41. A moving ring 45 whose inner wall is in contact with the inclined surface of the fixed block 43 is slidably connected in the cylinder 4. A first electric telescopic rod 46 is fixed on the cylinder 4, and a fixed rod 47 connected to the moving ring 45 is fixed at the telescopic end of the first electric telescopic rod 46. After starting the first electric telescopic rod 46 to drive the moving ring 45 to move towards the PE water supply pipe 9 through the fixed rod 47, the moving ring 45 can squeeze the fixed block 43, causing the connecting plate 41 to stretch the spring 42, and causing a group of connecting plates 41 to drive the first scraping knife 5 to move towards the axis of the cylinder 4; when the moving ring 45 moves in the direction away from the PE water supply pipe 9, the spring 42 will recover and contract, causing a group of connecting plates 41 to drive the first scraping knife 5 away from the axis of the cylinder 4, expanding the distance between a group of first scraping knives 5, so as to facilitate scraping the outer skin or inner wall of PE water supply pipes 9 of different sizes.

[0021] As Figure 1 and Figure 7 shown, a fixed plate 6 is fixed on one side of the workbench 1. Two symmetrically arranged connecting strips 61 are fixed on the top of the fixed plate 6, and a group of arc-shaped grooves are formed on the top of the connecting strips 61; an L-shaped plate 7 is fixed on the top of the fixed plate 6. A moving block 71 is slidably connected to the top inside the L-shaped plate 7. A lead screw 72 threadedly connected to the moving block 71 is rotatably connected inside the L-shaped plate 7. A second electric telescopic rod 73 is fixed at the bottom of the moving block 71, and a cross plate 74 is fixed at the telescopic end of the second electric telescopic rod 73. A U-shaped connecting frame 75 is fixed at the bottom of the cross plate 74. Third electric telescopic rods 76 are fixed on both sides of the connecting frame 75, and extrusion plates 77 located inside the connecting frame 75 are fixed at the telescopic ends of the third electric telescopic rods 76. The lead screw 72 is driven by a motor (not shown) arranged on the back of the L-shaped plate 7 (taking Figure 1Driven by a servo motor (not shown in the figure) in the orientation shown, several PE water supply pipes 9 can be respectively placed in a group of arc-shaped grooves on the connecting bar 61. Start the second electric telescopic rod 73 to move the cross plate 74 downward. The number of connecting frames 75 is two, and the two connecting frames 75 are respectively located between the two connecting bars 61. When a PE water supply pipe 9 enters the inner sides of the two connecting frames 75, the two third electric telescopic rods 76 on the connecting frames 75 are started, and then the two pressing plates 77 can be made to approach each other to clamp and fix the PE water supply pipe 9. The telescopic end of the second electric telescopic rod 73 contracts to clamp the PE water supply pipe 9 upward; then the lead screw 72 operates, and the moving block 71 can drive the second electric telescopic rod 73 to move towards the workbench 1, so that the clamped PE water supply pipe 9 is located directly above the two fixed seats 2. The telescopic end of the second electric telescopic rod 73 extends to lower the PE water supply pipe 9 and then it enters the notches on the two fixed seats 2. After the two abutting plates 21 in the notches of the fixed seats 2 approach each other, they can cooperate with the connecting frames 75 and the pressing plates 77 to complete the all-round fixation of the PE water supply pipe 9, avoiding the displacement of the PE water supply pipe 9 during processing, and it is also convenient to directly clamp the processed PE water supply pipe 9 later and unload it from the front of the workbench 1 (in the orientation shown in Figure 1 the figure).

[0022] As Figure 1 shown in Figure 3 and

[0023] As Figure 1 , Figure 2 and Figure 3 shown, a second automatic telescopic rod 36 is fixed at the axis center of the disc 34, and a rubber cone 37 located inside the cylinder 4 is fixed at the telescopic end of the second automatic telescopic rod 36. The first storage battery 48 can supply power to the first electric telescopic rod 46 and the second automatic telescopic rod 36. The second automatic telescopic rod 36 adopts a three-section telescopic rod; when it is necessary to scrape the outer surface of the PE water supply pipe 9, the second automatic telescopic rod 36 can be started to make the rubber cone 37 first insert into the inner side of the PE water supply pipe 9. After the further fixation of the PE water supply pipe 9 is completed, the first scraping knife 5 can start the subsequent scraping operation on the outer surface of the PE water supply pipe 9; and every time the first scraping knife 5 completes the scraping operation on the outer surface of the PE water supply pipe 9, when the cylinder 4 moves away from the PE water supply pipe 9, the second automatic telescopic rod 36 also drives the rubber cone 37 to separate from the PE water supply pipe 9. Subsequently, with the rotation of the disc 34, it enters the PE water supply pipe 9 again, and then the first scraping knife 5 starts the scraping operation on the PE water supply pipe 9 again; when it is necessary to scrape the inner wall of the PE water supply pipe 9, the telescopic end of the second automatic telescopic rod 36 contracts, so that the rubber cone 37 moves to one end of the connecting plate 41 away from the PE water supply pipe 9 to avoid the rubber cone 37 affecting the normal movement of the connecting plate 41; the rubber cone 37 is fixed to the telescopic end of the second automatic telescopic rod 36 by screws, and the screws can be removed to separate the rubber cone 37 from the second automatic telescopic rod 36 to replace rubber cones 37 of different models.

[0024] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, one end of the connecting plate 41 located outside the cylinder 4 is fixed with a connector 44 by bolts. The first scraping knife 5 is fixed inside the connector 44. After the first scraping knife 5 moves horizontally, it is used to scrape the end of the PE water supply pipe 9. After the protruding part of the connector 44 is inserted into the socket on the connecting plate 41, the connector 44 and the connecting plate 41 can be fixed together with bolts; the cutting edge direction of the first scraping knife 5 is set from left to right (horizontally) so as to facilitate opening a single-character slot on the outer surface or inner wall of the PE water supply pipe 9 each time.

[0025] As Figure 5As shown, the scraping workpiece includes a second scraping tool 8. Blades are provided at both the top and bottom of the second scraping tool 8. After the second scraping tool 8 rotates around the axis of the PE water supply pipe 9, it is used to scrape the end of the PE water supply pipe 9. Both the second scraping tool 8 and the first scraping tool 5 are rectangular in the middle and triangular at both ends. When the second scraping tool 8 is fixed in the connector 44, the cylinder 4 can be moved towards the PE water supply pipe 9. After a set of second scraping tools 8 enclose the end of the PE water supply pipe 9, a set of connecting plates 41 are moved towards the axis of the cylinder 4, and the blade of the second scraping tool 8 close to the axis of the cylinder 4 cuts into the outer surface of the PE water supply pipe 9 to an appropriate depth. Then, the motor 31 can be started to drive the cylinder 4 to drive the second scraping tool 8 to rotate. When the second scraping tool 8 makes a circular groove on the PE water supply pipe 9, the first automatic telescopic rod 39 drives the cylinder 4 to move away from the fixed seat 2, thereby driving the second scraping tool 8 to move and completing the scraping operation on the outer skin of the end of the PE water supply pipe 9. When the inner wall of the PE water supply pipe 9 needs to be scraped, after a set of connecting plates 41 are moved towards the axis of the cylinder 4, a set of second scraping tools 8 enter the inside of the PE water supply pipe 9. Then, a set of connecting plates 41 are moved away from the axis of the cylinder 4. After the blade of the second scraping tool 8 away from the axis of the cylinder 4 cuts into the inner wall of the PE water supply pipe 9 to an appropriate depth, the above operation can be repeated to complete the scraping operation on the inner wall of the end of the PE water supply pipe 9.

[0026] As Figure 1 and Figure 6 shown, two third automatic telescopic rods 22 are fixed on the fixed seat 2. The telescopic ends of the two third automatic telescopic rods 22 are respectively connected to two pressing plates 21. A rubber pad 23 is fixed at the bottom in the notch of the fixed seat 2. A second battery 78 is fixed on the top of the cross plate 74. After starting the third automatic telescopic rod 22, the pressing plate 21 can be driven to move. After the two pressing plates 21 move closer to each other, the PE water supply pipe 9 is clamped and fixed. The rubber pad 23 can support the PE water supply pipe 9, increase the friction with the PE water supply pipe 9, and improve the stability of the PE water supply pipe 9. Rubber pads 23 can also be provided on the pressing plate 21, the extrusion plate 77, and the top inside the connecting frame 75.

[0027] As Figure 1 shown, the number of the lifting plates 3 is two, and the fixed seat 2 is located between the two lifting plates 3. Cylinders 4 are respectively arranged on the two lifting plates 3 to facilitate scraping operations on the outer skins or inner walls at both ends of the PE water supply pipe 9 simultaneously.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An end processing device for producing PE water supply pipes, comprising a workbench (1), characterized in that: A fixed seat (2) with a notch on the top is fixed on the workbench (1), and both inner surfaces of the fixed seat (2) are provided with mutually approachable abutment plates (21); a lifting plate (3) is provided on the top of the workbench (1), and a cylinder (4) that can move toward the fixed seat (2) is provided on the lifting plate (3); a group of connecting plates (41) distributed in a ring array is provided in the cylinder (4), and the group of connecting plates (41) can evenly move toward or away from the axis of the cylinder (4); one end of the connecting plate (41) close to the fixed seat (2) is located outside the cylinder (4) and is detachably connected to a scraping workpiece, and the scraping workpiece includes a No. 1 scraper (5) with blades on the top and bottom; a motor (31) for driving the cylinder (4) to rotate is provided on the lifting plate (3).

2. The end processing device for producing a PE water supply pipe according to claim 1, characterized in that: A spring (42) is fixed between the connecting plate (41) and the inner wall of the cylinder (4); a fixing block (43) having one surface arranged in an inclined manner is fixed on the connecting plate (41); a moving ring (45) whose inner wall contacts the inclined surface of the fixing block (43) is slidably connected in the cylinder (4); a No. 1 electric telescopic rod (46) is fixed on the cylinder (4); a fixing rod (47) connected to the moving ring (45) is fixed at the telescopic end of the No. 1 electric telescopic rod (46).

3. The end processing device for producing a PE water supply pipe according to claim 1, characterized in that: A fixed plate (6) is fixed on one side of the workbench (1), two left-right symmetrical connecting strips (61) are fixed on the top of the fixed plate (6), and a group of arc grooves are opened on the top of the connecting strip (61); an L-shaped plate (7) is fixed on the top of the fixed plate (6), a moving block (71) is slidably connected to the top of the L-shaped plate (7), a screw rod (72) threadedly connected to the moving block (71) is rotatably connected to the L-shaped plate (7), a No. 2 electric telescopic rod (73) is fixed on the bottom of the moving block (71), a cross plate (74) is fixed on the telescopic end of the No. 2 electric telescopic rod (73), a U-shaped connecting frame (75) is fixed on the bottom of the cross plate (74), a No. 3 electric telescopic rod (76) is fixed on both sides of the connecting frame (75), and a squeezing plate (77) located in the connecting frame (75) is fixed on the telescopic end of the No. 3 electric telescopic rod (76).

4. The end processing device for producing a PE water supply pipe according to claim 2, characterized in that: A hydraulic rod (32) is provided below the workbench (1) and has a telescopic end connected to the lifting plate (3); a vertical plate (33) located on the side of the cylinder (4) away from the fixed seat (2) is slidably connected to the top of the lifting plate (3); a disk (34) is rotatably connected to the side of the vertical plate (33) close to the cylinder (4); a connecting rod (35) connected to the cylinder (4) is fixed on the disk (34); a motor (31) is fixed on the vertical plate (33) and a rotating shaft is fixed to the disk (34); a moving plate (38) is slidably connected to the lifting plate (3); the cylinder (4) passes through the moving plate (38) and is rotatably connected to the moving plate (38); a No. 1 automatic telescopic rod (39) whose telescopic end is fixed to the moving plate (38) is fixed on the lifting plate (3); and a No. 1 storage battery (48) is fixed on the disk (34).

5. The end processing device for producing PE water supply pipe according to claim 4, characterized in that: A second automatic telescopic rod (36) is fixed at the axis of the disc (34), and a rubber cone (37) located in the cylinder (4) is fixed at the telescopic end of the second automatic telescopic rod (36).

6. The end processing device for producing a PE water supply pipe according to claim 1, characterized in that: The end of the connecting plate (41) located outside the cylinder (4) is fixed with a connecting head (44) by means of bolts, and a No. 1 scraper (5) is fixed on the inner side of the connecting head (44). The No. 1 scraper (5) is used to scrape the end of the PE water supply pipe (9) after being moved horizontally.

7. The end processing device for producing a PE water supply pipe according to claim 1, characterized in that: The scraping workpiece comprises a No. 2 scraper (8), the top and bottom of the No. 2 scraper (8) are both provided with blades, and the No. 2 scraper (8) is used to scrape the end of the PE water supply pipe (9) after rotating around the axis of the PE water supply pipe (9).

8. The end processing device for producing a PE water supply pipe according to claim 3, characterized in that: Two No. 3 automatic telescopic rods (22) are fixed on the fixing seat (2), and the telescopic ends of the two No. 3 automatic telescopic rods (22) are respectively connected to two abutment plates (21), and a rubber pad (23) is fixed at the bottom of the notch of the fixing seat (2); and a No. 2 storage battery (78) is fixed on the top of the horizontal plate (74).

9. The end processing device for producing a PE water supply pipe according to claim 1, characterized in that: There are two lifting plates (3), and the fixing seat (2) is located between the two lifting plates (3).

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