Automatic tail cutting machine for metal bar with length control

Abstract

The application provides a metal rod automatic tail cutting machine with length control, which is applied to the technical field of automatic tail cutting machines and has the technical scheme as follows: a rack, a cutting station, a tail pushing mechanism for pushing the tail of the metal rod on the cutting station to adjust the tail cutting length, a limiting mechanism for limiting the moving length of the metal rod on the cutting station, a fixing mechanism for fixing the metal rod on the cutting station, a cutting mechanism for cutting the tail of the metal rod fixed on the cutting station, and a monitoring mechanism for monitoring whether the tail length of the metal rod is within a preset length range; if the tail length of the metal rod exceeds the maximum value of the preset length, the tail pushing mechanism and the limiting mechanism jointly and continuously push the metal rod until the tail length of the metal rod is within the preset length range; and the application has the technical effect that the parameters of tail cutting can be dynamically adjusted according to the length of the metal rod, thereby improving the utilization rate of metal rod waste.

Description

Technical Field

[0001] This invention relates to the field of automatic tailing machine technology, and in particular to an automatic tailing machine for metal bars with length control. Background Technology

[0002] In industrial production, the processing and use of metal rods generates a large amount of waste of varying lengths. After proper treatment (such as cutting off the tail), this waste can still be reused as raw material in production, thereby reducing resource waste and improving material utilization. However, due to the significant differences in the length of the waste, it is necessary to cut the waste to different lengths according to actual production needs.

[0003] However, existing cutting equipment can only achieve fixed-length cuts during the cutting process and cannot dynamically adjust the cutting parameters according to the length of the metal bar. This results in long tails of the metal bar scrap, leading to material waste. Therefore, the tail cutting of metal bars currently relies mainly on manual operation. Workers need to manually adjust the cutting equipment based on experience or measurement results. The manual cutting process is time-consuming and cannot meet the efficiency requirements of large-scale industrial production, which seriously restricts the recycling of metal bar scrap. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic tail-cutting machine for metal bars with length control. Its advantage is that it can dynamically adjust the parameters of the cutting tail according to the length of the metal bar, thereby improving the utilization rate of metal bar waste.

[0005] To achieve the above and other related objectives, the present invention provides the following technical solution:

[0006] An automatic tail-cutting machine for metal bars with length control includes a frame and a cutting station set on the frame;

[0007] A tail-pushing mechanism is provided at one end of the cutting station and is used to push the tail of the metal bar on the cutting station to adjust the tail length.

[0008] A limiting mechanism is provided at the other end of the cutting station and is used to limit the movement length of the metal bar at the cutting station;

[0009] A fixing mechanism is provided on the frame near the limiting mechanism and is used to fix the metal rod at the cutting station;

[0010] A cutting mechanism, which is mounted on a frame and is used to cut the tail of a metal bar fixed at a cutting station;

[0011] The monitoring mechanism is used to monitor whether the tail length of the metal rod to be cut is within a preset length range. The monitoring mechanism is electrically connected to the tail-pushing mechanism and the limiting mechanism. If the tail length of the metal rod to be cut exceeds the maximum value of the preset length, the monitoring mechanism sends an electrical signal to make the tail-pushing mechanism and the limiting mechanism work together to continuously push the metal rod to move on the cutting station until the tail length of the metal rod to be cut is within the preset length range.

[0012] In one embodiment of the present invention, a feeding mechanism is further included, the feeding mechanism including a feeding trough disposed on the frame, a lifting drive component disposed on the frame, and a lifting plate disposed at the opening of the feeding trough and driven by the lifting drive component to move vertically reciprocating.

[0013] The bottom of the feeding trough is set as a first inclined surface that slopes towards the opening, and several metal bars are laid flat on the first inclined surface in sequence.

[0014] The upper end of the lifting plate is provided with a second inclined surface, and a guide plate is fixed on the cutting station. A third inclined surface is provided on the guide plate. The metal rod rolls onto the lifting plate due to gravity. The lifting plate rises and is guided onto the guide plate by the action of the second inclined surface. Under the action of the third inclined surface, the metal rod is guided to the cutting station.

[0015] In one embodiment of the present invention, a plurality of support members are provided on one side of the feeding trough, and the plurality of support members are distributed along a straight line to form a cutting station;

[0016] The support includes a fixed plate fixed to the frame, a support plate movably mounted on the fixed plate, a guide post fixed at one end to the fixed plate and slidably connected to the support plate, and a spring sleeved on the guide post and with its two ends abutting against the fixed plate and the support plate respectively.

[0017] The top of the support plate is provided with a fourth inclined surface distributed in a V shape, and ball bearings are rotatably arranged on the fourth inclined surface.

[0018] In one embodiment of the present invention, the tail-pushing mechanism includes a first slider slidably disposed on the frame, a push rod fixedly disposed on the first slider, and a first cylinder fixed on the frame and used to drive the first slider to slide horizontally back and forth.

[0019] The push rod is coaxially arranged with the metal rod on the cutting station.

[0020] In one embodiment of the present invention, the fixing mechanism includes a fixing frame fixed on a machine frame, a second cylinder fixed on the fixing frame, a rotating frame fixed on the piston rod of the second cylinder, and two pulleys with side walls in contact and rotatably mounted on the rotating frame, the two pulleys being located directly above the cutting station.

[0021] In one embodiment of the present invention, the limiting mechanism includes a limiting drive member disposed on the frame and a limiting baffle connected to the limiting drive member;

[0022] The limiting drive component includes a limiting frame, a servo motor fixed on the limiting frame, a lead screw rotatably mounted on the limiting frame, and a second slider threadedly connected to the lead screw and sliding horizontally on the limiting frame. The limiting baffle is mounted on the second slider.

[0023] In one embodiment of the present invention, a mounting frame is fixedly provided on the second slider, the limiting baffle is rotatably provided on the mounting frame, and a third cylinder is fixedly provided on the second slider, the piston rod of the third cylinder being hinged to one end of the limiting baffle.

[0024] In one embodiment of the present invention, the frame is provided with a toggle assembly for pushing the cut metal bar material out of the cutting station;

[0025] The toggle assembly includes a toggle drive fixed to the frame and a lever that is driven to slide by the toggle drive.

[0026] In one embodiment of the present invention, a feeding port is provided on the frame located below the cutting mechanism, the feeding port is connected to a material guide channel, and a receiving trough is placed below the material guide channel.

[0027] In one embodiment of the present invention, the monitoring mechanism includes a distance sensor fixed on a frame near the cutting mechanism and a sensing rod fixed on a first slider.

[0028] As described above, the automatic tail-cutting machine for metal bars with length control according to the present invention has the following beneficial effects:

[0029] 1. A metal rod is placed on the cutting station. A tail-pushing mechanism pushes the metal rod on the cutting station to adjust the tail length. A limiting mechanism restricts the movement of the metal rod on the cutting station. A monitoring mechanism monitors whether the tail length of the metal rod to be cut is within a preset length range. If the tail length exceeds the maximum preset length, the monitoring mechanism sends an electrical signal to cause the tail-pushing mechanism and the limiting mechanism to work together to continuously push the metal rod on the cutting station until the tail length is within the preset length range. Then, a fixing mechanism fixes the metal rod on the cutting station so that the cutting mechanism can cut the tail of the metal rod fixed on the cutting station. Under the combined action of the monitoring mechanism, tail-pushing mechanism, and limiting mechanism, the parameters of the tail cutting can be dynamically adjusted according to the length of the metal rod, thereby improving the utilization rate of metal rod waste.

[0030] 2. The feeding mechanism is used to automatically feed the metal bar to be cut to the cutting station; the actuating component is used to push the cut metal bar out of the cutting station; and the tail of the cut metal bar is directly guided to the receiving trough through the discharge port and the guide channel, thereby realizing automatic feeding, automatic cutting and automatic unloading, and improving the automation level of the equipment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0032] Figure 2 This is a side view of the overall structure of an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the cutting mechanism, tail-pushing mechanism, limiting mechanism, etc., according to an embodiment of the present invention;

[0034] Figure 4 This is a top view of the cutting mechanism, tail-pushing mechanism, limiting mechanism, etc., according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the tail-pushing mechanism, the limiting mechanism, etc., according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the limiting mechanism according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the support member according to an embodiment of the present invention.

[0038] Reference numerals: 1. Frame; 2. Cutting station; 21. Support component; 211. Fixing plate; 212. Support plate; 213. Guide column; 214. Spring; 22. Fourth inclined plane; 23. Ball bearing; 3. Tail-pushing mechanism; 31. First slider; 32. Push rod; 33. First cylinder; 4. Limiting mechanism; 41. Limiting drive component; 411. Limiting frame; 412. Servo motor; 413. Lead screw; 414. Second slider; 42. 43. Limiting baffle; 44. Mounting bracket; 55. Third cylinder; 6. Fixing mechanism; 76. Fixing bracket; 87. Second cylinder; 98. Rotating bracket; 10. Pulley; 11. Cutting mechanism; 22. Monitoring mechanism; 33. Distance sensor; 44. Sensing rod; 55. Feeding mechanism; 66. Discharge chute; 77. Lifting drive component; 88. Lifting plate; 99. Guide plate; 10. Actuating assembly; 11. Actuating drive component; 12. Actuating lever; 13. Discharge port. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0040] Please see Figures 1 to 7 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0041] Please see Figure 1 and Figure 2 The present invention provides an automatic tail cutting machine for metal bars with length control, including a frame 1, a cutting station 2, a tail pushing mechanism 3, a limiting mechanism 4, a fixing mechanism 5, a cutting mechanism 6, a monitoring mechanism 7, a feeding mechanism 8, and a toggle assembly 9.

[0042] Frame 1 is an integral support structure used to install various functional components;

[0043] Please see Figure 1 , Figure 2 and Figure 7 The cutting station 2 is set on the frame 1 and is used to support the metal rod to be cut. In this embodiment, the cutting station 2 is composed of several support members 21, which are distributed in a straight line to stably support the metal rod. The support member 21 includes a fixed plate 211 bolted to the frame 1, a support plate 212 movably set on the fixed plate 211, a guide post 213 fixed at one end to the fixed plate 211 and slidably connected to the support plate 212, and a spring 214 sleeved on the guide post 213 and abutting the fixed plate 211 and the support plate 212 at both ends respectively. In this embodiment, the top of the support plate 212 is provided with a fourth inclined surface 22 distributed in a V shape, and a ball bearing 23 is rotatably set on the fourth inclined surface 22 to reduce the frictional resistance when the metal rod moves.

[0044] Please see Figure 1 and Figure 2The feeding mechanism 8 is used to automatically transport metal bars to the cutting station 2. The feeding mechanism 8 includes a feeding trough 81 set on the frame 1, a lifting drive 82 fixed on the frame 1, and a lifting plate 83 set at the opening of the feeding trough 81 and driven vertically and reciprocating by the lifting drive 82. The bottom of the feeding trough 81 is set as a first inclined surface that slopes towards the opening. Several metal bars are laid flat on the first inclined surface in sequence, so that the metal bars can roll towards the opening side of the feeding trough 81 by gravity. The upper end of the lifting plate 83 is provided with a second inclined surface. A guide plate 84 is fixed on the support member 21. A third inclined surface is provided on the guide plate 84. The lifting drive 82 in this embodiment can be a driving cylinder. The metal bars roll onto the lifting plate 83 due to gravity. When the lifting plate 83 rises, the second inclined surface guides the metal bars to the guide plate 84, and under the action of the third inclined surface, they roll into the cutting station 2.

[0045] Please see Figure 3 , Figure 4 and Figure 5 The tail-pushing mechanism 3 is located at one end of the cutting station 2 and is used to push the tail of the metal bar to adjust the cutting length. The tail-pushing mechanism 3 includes a first slider 31 slidably mounted on the frame 1, a push rod 32 fixedly mounted on the first slider 31, and a first cylinder 33 fixed on the frame 1 and used to drive the first slider 31 to slide horizontally back and forth. The piston rod of the first cylinder 33 is bolted to the first slider 31. The push rod 32 is coaxially mounted with the metal bar on the cutting station 2, so that the retraction of the piston rod of the first cylinder 33 can drive the first slider 31 to move closer to the tail of the metal bar. The push rod 32 pushes the axial position of the metal bar to move to ensure accurate pushing direction.

[0046] Please see Figure 3 and Figure 6 The limiting mechanism 4 is located at the other end of the cutting station 2 to limit the moving length of the metal bar. The limiting mechanism 4 includes a limiting drive 41 and a limiting baffle 42. The limiting drive 41 includes an upper limit frame 411 bolted to the frame 1, a servo motor 412 bolted to the limiting frame 411, a lead screw 413 rotatably mounted on the limiting frame 411, and a second slider 414 threadedly connected to the lead screw 413 and sliding horizontally on the limiting frame 411. The lead screw 413 is arranged along the horizontal direction of the cutting station 2. Thus, the servo motor drives the lead screw 413 to rotate, which in turn drives the second slider 414 to slide the limiting baffle 42 horizontally, thereby adjusting and limiting the moving length of the metal bar on the cutting station 2.

[0047] A mounting bracket 43 is bolted to the second slider 414, and a limiting baffle 42 is rotatably mounted on the mounting bracket 43. A third cylinder 44 is fixedly mounted on the second slider 414, and the piston rod of the third cylinder 44 is hinged to one end of the limiting baffle 42 to realize the flipping action of the limiting baffle 42, thereby enabling the limiting baffle 42 to release the metal rod, thus preparing for the unloading.

[0048] Please see Figure 5 The frame 1 is equipped with a toggle assembly 9 for pushing the cut metal rods out of the cutting station 2. The toggle assembly 9 includes a toggle drive 91 bolted to the frame 1 and a lever 92 driven by the toggle drive 91 to slide. In this embodiment, the toggle drive 91 can be a cross-shaped linear module. After the cutting mechanism 6 cuts the tail of the metal rod, the toggle drive 91 drives the lever 92 to move toward one side of the metal rod (in the Y-axis direction in the figure) so that the lever 92 is located behind one end of the metal rod. The toggle drive 91 then drives the metal rod to move along the extension direction of the cutting station 2 (in the X-axis direction in the figure), and then pushes the cut metal rods out of the cutting station 2 through the lever 92, thereby realizing the automatic unloading of the cut metal rods.

[0049] Please see Figure 3 and Figure 5 The fixing mechanism 5 is installed on the frame 1 near the limiting mechanism 4 and is used to fix the metal bar on the cutting station 2. The fixing mechanism 5 includes a fixing frame 51 bolted to the frame 1, a second cylinder 52 bolted to the fixing frame 51, a rotating frame 53 bolted to the piston rod of the second cylinder 52, and two pulleys 54 with their side walls in contact and rotatably mounted on the rotating frame 53. The two pulleys 54 are located directly above the cutting station 2. When the piston rod driven by the second cylinder 52 is released, it drives the two pulleys 54 to press down, so that the two pulleys 54 cooperate with the support member 21 to clamp and fix the metal bar, thereby improving the stability of the metal bar during cutting.

[0050] The cutting mechanism 6 is mounted on the frame 1 and is used to cut the tail of the metal bar fixed on the cutting station 2. The cutting mechanism 6 can be a circular saw, a laser cutter or a plasma cutter, etc., depending on the material of the metal bar and the cutting requirements. In this embodiment, the circular saw cutting mechanism 6 is preferred.

[0051] Please see Figure 5The monitoring mechanism 7 is used to monitor whether the tail length of the metal bar to be cut is within the preset length range. The monitoring mechanism 7 includes a distance sensor 71 fixed on the frame 1 near the cutting mechanism 6 and a sensing rod 72 fixed on the first slider 31. The end of the detection end of the distance sensor 71 is flush with the cutting surface of the circular saw, and the end of the sensing end of the sensing rod 72 is flush with the end face of the push rod 32 near the tail of the metal bar.

[0052] This allows the distance sensor 71 to work in conjunction with the sensing rod 72. The distance between the distance sensor 71 and the sensing rod 72 is the real-time detected length of the tail of the metal rod to be cut. If the tail length is detected to exceed the preset range, an electrical signal is sent to make the tail-pushing mechanism 3 and the limiting mechanism 4 work together to continuously push the metal rod to move on the cutting station 2 so that the tail length of the metal rod to be cut is within the preset length range.

[0053] Please see Figure 3 , Figure 4 and Figure 5 In this embodiment, a feeding port 10 is provided on the frame 1 located below the circular saw. The feeding port 10 is connected to a material guide channel (not shown in the figure), and a receiving trough (not shown in the figure) is placed below the material guide channel. The tail of the cut metal rod falls into the feeding port 10 without support and is directly guided to the receiving trough through the material guide channel for feeding and collection.

[0054] Brief description of usage:

[0055] 1. Loading stage: The metal bar rolls from the unloading trough 81 to the lifting plate 83. The lifting drive component 82 drives the lifting plate 83 to rise, and guides the metal bar to the support component 21 of the cutting station 2 through the second and third inclined surfaces.

[0056] Length detection and adjustment: The distance sensor 71 works in conjunction with the sensing rod 72. The distance between the distance sensor 71 and the sensing rod 72 is the real-time detected length of the tail of the metal rod to be cut. If the tail length exceeds the preset range, the tail pushing mechanism 3 is controlled to push the metal rod. At the same time, the servo motor 412 of the limit mechanism 4 drives the lead screw 413 to adjust the position of the limit baffle 42 until the tail length meets the requirements.

[0057] Fixing and cutting: The fixing mechanism 5 presses down the pulley 54 to clamp the metal rod, and the cutting mechanism 6 starts to complete the tail cutting operation;

[0058] Material feeding stage: The actuating component 9 pushes out the cut good product, and the waste material falls into the receiving trough through the feeding port 10.

[0059] In summary, the automatic tail-cutting machine of the present invention achieves dynamic adjustment of the tail-cutting length of metal bars through the coordinated operation of the monitoring mechanism 7, the tail-pushing mechanism 3, and the limiting mechanism 4, which significantly improves the material utilization rate. At the same time, the automated feeding, cutting and unloading design greatly improves production efficiency and is suitable for industrial mass production.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An automatic tail-cutting machine for metal bars with length control, characterized in that: It includes a frame (1) and a cutting station (2) set on the frame (1); Tail-pushing mechanism (3), which is set at one end of the cutting station (2) and is used to push the tail of the metal rod on the cutting station (2) to adjust the tail length; A limiting mechanism (4) is provided at the other end of the cutting station (2) and is used to limit the length of movement of the metal rod on the cutting station (2); Fixing mechanism (5), which is set on the frame (1) near the limiting mechanism (4) and is used to fix the metal rod on the cutting station (2); A cutting mechanism (6) is mounted on a frame (1) and is used to cut the tail of a metal rod fixed on a cutting station (2); The monitoring mechanism (7) is used to monitor whether the tail length of the metal rod to be cut is within the preset length range. The monitoring mechanism (7) is electrically connected to the tail-pushing mechanism (3) and the limiting mechanism (4). If the tail length of the metal rod to be cut exceeds the maximum value of the preset length, the monitoring mechanism (7) sends an electrical signal to make the tail-pushing mechanism (3) and the limiting mechanism (4) work together to continuously push the metal rod to move on the cutting station (2) so that the tail length of the metal rod to be cut is within the preset length range.

2. The automatic tail-cutting machine for metal bars with length control according to claim 1, characterized in that: It also includes a feeding mechanism (8), which includes a feeding trough (81) on the frame (1), a lifting drive (82) on the frame (1), and a lifting plate (83) at the opening of the feeding trough (81) and driven vertically by the lifting drive (82). The bottom of the feeding trough (81) is set as a first inclined surface that slopes towards the opening, and several metal rods are laid flat on the first inclined surface in sequence; The upper end of the lifting plate (83) is provided with a second inclined surface, and a guide plate (84) is fixed on the cutting station (2). A third inclined surface is provided on the guide plate (84). The metal rod rolls onto the lifting plate (83) due to gravity. The lifting plate (83) rises and guides the metal rod onto the guide plate (84) under the action of the second inclined surface and then guides the metal rod onto the cutting station (2) under the action of the third inclined surface.

3. The automatic tail-cutting machine for metal bars with length control according to claim 2, characterized in that: A plurality of support members (21) are provided on one side of the feeding trough (81), and the plurality of support members (21) are distributed in a straight line to form a cutting station (2); The support member (21) includes a fixed plate (211) fixed on the frame (1), a support plate (212) movably disposed on the fixed plate (211), a guide post (213) fixed at one end to the fixed plate (211) and slidably connected to the support plate (212), and a spring (214) sleeved on the guide post (213) and abutting the fixed plate (211) and the support plate (212) at both ends respectively; The support plate (212) has a fourth inclined surface (22) arranged in a V-shape at the top, and a ball bearing (23) is rotatably arranged on the fourth inclined surface (22).

4. The automatic tail-cutting machine for metal bars with length control according to claim 1, characterized in that: The tail-pushing mechanism (3) includes a first slider (31) slidably disposed on the frame (1), a push rod (32) fixedly disposed on the first slider (31), and a first cylinder (33) fixed on the frame (1) and used to drive the first slider (31) to slide horizontally back and forth. The push rod (32) is coaxially arranged with the metal rod on the cutting station (2).

5. The automatic tail-cutting machine for metal bars with length control according to claim 1, characterized in that: The fixing mechanism (5) includes a fixing frame (51) fixed on the frame (1), a second cylinder (52) fixed on the fixing frame (51), a rotating frame (53) fixed on the piston rod of the second cylinder (52), and two pulleys (54) with their side walls in contact and rotatably mounted on the rotating frame (53). The two pulleys (54) are located directly above the cutting station (2).

6. The automatic tail-cutting machine for metal bars with length control according to claim 1, characterized in that: The limiting mechanism (4) includes a limiting drive (41) mounted on the frame (1) and a limiting baffle (42) connected to the limiting drive (41); The limiting drive component (41) includes a limiting frame (411), a servo motor (412) fixed on the limiting frame (411), a lead screw (413) rotatably mounted on the limiting frame (411), and a second slider (414) threadedly connected to the lead screw (413) and sliding horizontally on the limiting frame (411). The limiting baffle (42) is mounted on the second slider (414).

7. An automatic tail-cutting machine for metal bars with length control according to claim 6, characterized in that: A mounting bracket (43) is fixedly installed on the second slider (414), and the limiting baffle (42) is rotatably installed on the mounting bracket (43). A third cylinder (44) is fixedly installed on the second slider (414), and the piston rod of the third cylinder (44) is hinged to one end of the limiting baffle (42).

8. The automatic tail-cutting machine for metal bars with length control according to claim 7, characterized in that: The frame (1) is provided with a toggle assembly (9) for pushing the cut metal rods out of the cutting station (2); The toggle assembly (9) includes a toggle drive (91) fixed on the frame (1) and a lever (92) that is driven to slide by the toggle drive (91).

9. The automatic tail-cutting machine for metal bars with length control according to claim 1, characterized in that: A feeding port (10) is provided on the frame (1) located below the cutting mechanism (6). The feeding port (10) is connected to a material guide channel, and a receiving trough is placed below the material guide channel.

10. An automatic tail-cutting machine for metal bars with length control according to claim 5, characterized in that: The monitoring mechanism (7) includes a distance sensor (71) fixed on a frame (1) near the cutting mechanism (6) and a sensing rod (72) fixed on the first slider (31).

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