Excess material cutting device

Abstract

The utility model discloses an excess material cutting device, which is used for cutting excess materials on a front beam of an extruding machine, and comprises a rack, a cutting device and a driving device, the shearing mechanism comprises a shearing oil cylinder, a scissor rod and a pair of scissors and is used for cutting off excess materials on the front beam; and the unloading mechanism is installed on the side wall of the scissor rod and comprises a driving part, an unloading cutter and a movable connecting structure, the movable connecting structure is connected between the driving part and the unloading cutter so that the unloading cutter can move in a rotating mode under driving of the driving part, and the unloading cutter can unload excess materials cut off by the scissors. According to the excess material cutting device, the discharging mechanism is directly installed on the side wall of the scissor rod, a groove is prevented from being formed in the scissor rod, and therefore installation of the discharging mechanism is convenient, compared with the mode that a discharging rod is arranged to be in a special shape in the prior art, excess materials can be discharged only by arranging a discharging cutter and driving the discharging cutter to rotate, and the operation is simple and convenient. And the unloading action is convenient to implement.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a residual material cutting device. Background Art

[0002] The extruder is the main equipment for the production of light alloy (aluminum alloy, copper alloy and magnesium alloy) tubes, rods and profiles. It mainly uses the extrusion rod to extrude the hot-melt light alloy in the extrusion barrel to the forming die, and then extrude it through the forming port after being formed at the forming die. It is an important industrial process.

[0003] The die base of the forming die on the extruder is generally fastened to the beam of the extruder by bolts and other structures, and cannot be adjusted. There will be a gap between the extrusion barrel and the forming die, which can easily cause molten material to be retained during the forming process, affecting the next product forming. Therefore, a residual shear will be set on the extruder to shear the residual material at the outlet of the forming die after extrusion.

[0004] The conventional residual stock shearing structure includes a scissor bar, a pair of scissors mounted on the scissor bar, and a residual stock removal mechanism mounted on the scissor bar to remove the residual stock removed by the scissors. However, the residual stock removal mechanism is driven by a hydraulic cylinder in a linear motion, and a mounting slot for the residual stock removal mechanism is provided in the scissor bar, resulting in wasted material in the scissor bar and complicated processing. Utility Model Content

[0005] In order to solve at least one problem existing in the above-mentioned prior art, according to one aspect of the present invention, a residual material cutting device is provided for cutting residual material on the front beam of an extruder, comprising:

[0006] a frame mounted on the front beam;

[0007] a shearing mechanism comprising a shearing cylinder, a scissor lever, and scissors, wherein the shearing cylinder is mounted on the frame, and the scissor lever is connected between the output shaft of the shearing cylinder and the scissors, and is used to drive the scissors to move under the drive of the shearing cylinder to cut off the excess material on the front beam;

[0008] The unloading mechanism is installed on the side wall of the scissors rod, and includes a driving member, a unloading knife and a movable connection structure. The movable connection structure is connected between the driving member and the unloading knife, so that the unloading knife can move in a rotational manner under the drive of the driving member, so that the unloading knife can remove the remaining material cut off by the scissors.

[0009] In some embodiments, the movable connection structure is a slider, a guide groove is provided on the discharge knife, the slider is connected to the driving member, and is slidably arranged relative to the guide groove so that the discharge knife can be rotated under the telescopic drive of the driving member.

[0010] In some embodiments, the discharge mechanism further includes an elastic member connected between the scissor rod and the discharge knife so as to apply elastic force to the discharge knife.

[0011] In some embodiments, the unloading mechanism further includes a mounting seat and a rotating shaft, wherein the mounting seat is mounted on the scissor rod, the rotating shaft is connected to the mounting seat and is rotatably arranged with the unloading knife, and along the axial direction of the scissor rod, the elastic member is arranged between the driving member and the mounting seat.

[0012] In some embodiments, the guide groove is a waist-shaped hole opened on the discharge knife.

[0013] In some embodiments, the driving member is an electromagnet.

[0014] In some embodiments, the driving member is a cylinder and is rotatably arranged relative to the scissor lever;

[0015] The movable connection structure is a connecting rod structure, including a first connecting rod and a second connecting rod that are arranged to rotate with each other, the other end of the first connecting rod is arranged to rotate with the driving member, and the other end of the second connecting rod is arranged to rotate with the discharge knife.

[0016] In some embodiments, the frame includes a mounting frame and a bracket, the mounting frame is installed on the front beam of the extruder, a movable groove is opened in the bracket, the shearing mechanism passes through the movable groove along the axial direction of the shearing cylinder, and the scissor rod is arranged in the movable groove.

[0017] In some embodiments, a notch is provided at one end of the scissor lever where the scissors are mounted;

[0018] The unloading mechanism further comprises a mounting seat and a rotating shaft, wherein the mounting seat is mounted on the notch, and the rotating shaft is mounted on the mounting seat and is rotatably arranged together with the unloading knife.

[0019] In some embodiments, the excess material cutting device further includes a first guide member and a second guide member that are slidably arranged with respect to each other, wherein the first guide member is arranged on the outer wall of the bracket, and the second guide member is installed on the scissor rod.

[0020] In summary, the excess material removal device provided by the present invention has the following technical effects:

[0021] By directly installing the unloading mechanism on the side wall of the scissors rod, it is avoided to provide a groove on the scissors rod, thereby facilitating the installation of the unloading mechanism. At the same time, when the unloading mechanism unloads the residual material cut off by the scissors, the movable connection structure is connected between the driving member and the unloading knife, and the unloading knife is driven by the driving member to rotate in a rotational manner, so that the residual material cut off by the scissors is unloaded by the unloading knife. Compared with the prior art method of setting the unloading rod as a special shape, it is only necessary to set the unloading knife, and drive the unloading knife to rotate to unload the residual material, which is convenient for the implementation of the unloading action and avoids the deformation of the unloading rod after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a surplus material removal device according to a first embodiment of the prior art;

[0023] Figure 2 A schematic structural diagram of a second embodiment of a surplus material removal device in the prior art;

[0024] Figure 3 This is a schematic structural diagram of the unloading mechanism of the excess material removal device of the first embodiment of the utility model before unloading;

[0025] Figure 4 This is a schematic structural diagram of the unloading mechanism of the excess material removal device of the first embodiment of the utility model after unloading;

[0026] Figure 5 This is a schematic structural diagram of a surplus material removal device according to a second embodiment of the present invention;

[0027] Figure 6 for Figure 5 Right side view of the excess material removal device;

[0028] Figure 7 This is a schematic structural diagram of a surplus material removal device according to a third embodiment of the present invention.

[0029] Figures: 100-residue material cutting device, 10-frame, 11-mounting frame, 12-bracket, 121-movable groove, 20-shearing mechanism, 21-shearing cylinder, 22-scissor rod, 221-notch, 23-scissors, 30-unloading mechanism, 31-driving member, 32-unloading knife, 321-guide groove, 33-movable connection structure, 331-first connecting rod, 332-second connecting rod, 34-elastic member, 35-mounting seat, 36-rotating shaft, 40-first guide member, 50-second guide member, 200-residue material cutting device, 60-frame, 70-shearing mechanism, 71-cylinder, 72-scissor rod, 721-mounting groove, 722-penetrating groove, 73-scissors, 80-unloading mechanism, 81-unloading cylinder, 82-unloading rod, 300-front beam, 400-residue material. DETAILED DESCRIPTION

[0030] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 , is a structural schematic diagram of a residual material cutting device 200 in the prior art. The residual material cutting device 200 is installed on the front beam 300 and includes a frame 60, a shearing mechanism 70 and a unloading mechanism 80.

[0035] The frame 60 is mounted on the front beam 300, and the shearing mechanism 70 is mounted on the frame 60. The shearing mechanism 70 includes a cylinder 71, a scissor lever 72, and a scissor 73. The scissor lever 72 is connected between the output shaft of the shearing cylinder 71 and the scissor 73, and is used to drive the scissor 73 to move under the drive of the shearing cylinder 71. The discharge mechanism 80 is mounted on the scissor lever 72 and includes a discharge cylinder 81 and a discharge lever 82. The discharge lever 82 is directly connected to the discharge cylinder 81, so that the discharge cylinder 81 drives the discharge lever 82 to move in a linear manner to achieve discharge. When installing the unloading cylinder 81, an installation groove 721 for installing the unloading cylinder 81 is dug out in the scissor rod 72, and the unloading rod 82 is passed through the scissor rod 72. Therefore, a penetration groove 722 for the unloading rod 82 to pass through needs to be opened on the scissor rod 72, which results in a complex molding structure of the scissor rod 72 and troublesome processing; at the same time, the unloading cylinder 81 is installed in the installation groove 721, and it is difficult to disassemble and maintain it in the event of a fault or oil leakage in the later stage.

[0036] See also Figure 2If the unloading cylinder 81 is installed outside the scissor rod 72, in order to ensure the unloading effect, the unloading rod 82 needs to be made into a special shape, which makes the structural processing of the unloading rod 82 complicated. At the same time, the special shape is easy to deform after long-term use, and the service life is short.

[0037] Example 1

[0038] To solve the above technical problems, please refer to Figure 3 and Figure 4 , which is a residual material cutting device 100 provided in the first embodiment of the present utility model, is used to cut the residual material 400 on the front beam 300 of the extruder, and includes a frame 10, a shearing mechanism 20 and a discharge mechanism 30.

[0039] Among them, the frame 10 is used to be installed on the front beam 300; the shearing mechanism 20 includes a shearing cylinder 21, a scissor rod 22 and a scissors 23. The shearing cylinder 21 is installed on the frame 10. The scissor rod 22 is connected between the output shaft of the shearing cylinder 21 and the scissors 23, and is used to drive the scissors 23 to move under the drive of the shearing cylinder 21, so as to realize the cutting of the residual material 400 on the front beam 300; the unloading mechanism 30 is installed on the side wall of the scissor rod 22, and includes a driving member 31, a unloading knife 32 and a movable connection structure 33. The movable connection structure 33 is connected between the driving member 31 and the unloading knife 32, so that the unloading knife 32 can move in a rotational manner under the drive of the driving member 31, so that the unloading knife 32 can realize the unloading of the residual material 400 cut off by the scissors 23.

[0040] The above-mentioned residual material cutting device 100 avoids the need to provide a through groove on the scissor rod 22 by directly installing the unloading mechanism 30 on the side wall of the scissor rod 22, thereby facilitating the installation of the unloading mechanism 30. At the same time, when the unloading mechanism 30 unloads the residual material 400 cut off by the scissors 23, the movable connection structure 33 is connected between the driving member 31 and the unloading knife 32, and the unloading knife 32 is driven by the driving member 31 to rotate, so that the residual material 400 cut off by the scissors 23 can be removed by the unloading knife 32. Compared with the prior art method of setting the unloading rod 82 as a special shape, only the unloading knife 32 needs to be set, and the residual material 400 can be unloaded by driving the unloading knife 32 to rotate, which facilitates the implementation of the unloading action and avoids the deformation of the unloading rod 82 after long-term use.

[0041] Specifically, see Figure 3 and Figure 4 This is a structural diagram of a discharge mechanism 30 according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the remaining material 400 before unloading. Figure 4Figure 3 is a schematic diagram of the unloading process after the residual material 400 is removed. The movable connection structure 33 is a slider, and the unloading knife 32 is provided with a guide groove 321. The slider is connected to the driving member 31 and slides relative to the guide groove 321 to enable the unloading knife 32 to rotate under the telescopic drive of the driving member 31. In this way, under the drive of the driving member 31, the slider slides within the guide groove 321 to realize the rotation of the unloading knife 32, thereby rotating the unloading knife 32 from its original state of being close to the scissors 23 to a state of being away from the scissors 23, thereby unloading the residual material 400 on the scissors 23.

[0042] Specifically, the guide groove 321 of this embodiment is a waist-shaped hole opened on the discharge knife 32, so as to facilitate the formation of the guide groove 321. In other embodiments, a guide wall can also be set on the discharge knife 32, and a guide groove 321 for the slider to slide is formed between two opposite guide walls.

[0043] The driving member 31 of this embodiment is an electromagnet, thereby avoiding the risk of oil leakage compared to the method of driving an oil cylinder and facilitating the maintenance of the driving member 31 .

[0044] Understandably, see Figure 3 and Figure 4 When the unloading knife 32 rotates relative to the scissor rod 22, the unloading mechanism 30 also includes a mounting seat 35 and a rotating shaft 36. The mounting seat 35 is installed on the scissor rod 22, and the rotating shaft 36 is connected to the mounting seat 35 and is rotatably arranged with the unloading knife 32. The rotating shaft 36 is provided to support the rotation of the unloading knife 32, so that when the slider slides in the guide groove 321 under the drive of the electromagnet, the unloading knife 32 can be driven to rotate stably.

[0045] Further, see Figure 3 and Figure 4 In order to facilitate the rapid return of the discharge knife 32 after completing the cutting, the discharge mechanism 30 also includes an elastic member 34, which is connected between the scissors rod 22 and the discharge knife 32, so as to be able to apply an elastic force to the discharge knife 32. Therefore, through the setting of the elastic member 34, when the electromagnet drives the discharge knife 32 to rotate to discharge the residual material 400 on the scissors 23, the elastic member 34 is compressed so that the elastic member 34 generates an elastic force. After the residual material 400 is discharged, the discharge knife 32 is driven to return to its original position quickly under the action of the elastic force of the elastic member 34, thereby facilitating the next use of the discharge knife 32.

[0046] Furthermore, along the axial direction of the scissor rod 22, the elastic member 34 of this embodiment is arranged between the driving member 31 and the mounting seat 35, that is, close to the end of the discharge knife 32 connected to the electromagnet, so that after the electromagnetic rod drives the discharge knife 32 to rotate, the elastic member 34 can be quickly compressed to generate an elastic force by the elastic member 34; at the same time, relative to the method of arranging the elastic member 34 below the mounting seat 35, the arrangement of the elastic member 34 is avoided from interfering with the rotation of the discharge knife 32.

[0047] Among them, when the unloading mechanism 30 of this embodiment is installed, the frame 10 includes a mounting frame 11 and a bracket 12, the mounting frame 11 is installed on the front beam 300 of the extruder, and a movable groove 121 is opened in the bracket 12. The shearing mechanism 20 passes through the movable groove 121 of the bracket 12 along the axial direction of the shear cylinder 21, and the scissor rod 22 is arranged in the movable groove 121. In this way, the movable groove 121 is opened in the bracket 12, and a guide structure can be set on the inner wall or outer wall of the bracket 12 to facilitate the telescopic movement of the scissor rod 22.

[0048] The above-mentioned residual material 400 cutting mechanism avoids oil leakage caused by using a cylinder by setting the driving part 31 as an electromagnet. At the same time, the electromagnet can quickly drive the discharge knife 32 to rotate, directly applying driving force to the rotation of the discharge knife 32, and can remove the residual material 400 more quickly.

[0049] Example 2

[0050] See also Figures 5 to 7 , which is a structural schematic diagram of a surplus material cutting device 100 according to another embodiment of the present invention. In this embodiment, the driving member 31 is rotatably arranged relative to the scissors rod 22. Specifically, the driving member 31 is an oil cylinder; the movable connection structure 33 is a connecting rod structure, including a first connecting rod 331 and a second connecting rod 332 which are rotatably arranged. The other end of the first connecting rod 331 is rotatably arranged with the driving member 31; the other end of the second connecting rod 332 is rotatably arranged with the discharge knife 32. In this way, under the drive of the driving member 31, the driving member 31 itself rotates relative to the scissors rod 22. At the same time, the first connecting rod 331 and the second connecting rod 332 rotate with each other, and drive the discharge knife 32 to rotate. The discharge knife 32 is directly driven by the oil cylinder, and the force working condition is better, thereby realizing the removal of the surplus material 400 on the scissors 23.

[0051] Thus, compared with the prior art arrangement in which the unloading cylinder 81 is installed in the scissor lever 22 and the unloading lever 82 is rod-shaped, the unloading mechanism 30 of this embodiment has the following technical effects:

[0052] (1) Since the driving member 31 is installed outside the scissor lever 22, it can be easily removed for maintenance;

[0053] (2) Compared with the prior art where the discharge rod 82 is in a rod shape, the discharge rod 82 is long and easily deformed. The present application adopts a connecting rod to avoid deformation.

[0054] (3) Since the discharge knife 32 can be placed directly under the scissor rod 22, it can directly contact the residual material 400, shortening the length of the entire discharge mechanism 30, thereby reducing the occupied volume of the entire residual material cutting device 100, so that the residual material cutting device 100 can be miniaturized.

[0055] Specifically, see Figure 5 When installing the unloading mechanism 30 of this embodiment, a notch 221 is provided at the lower end of the scissor rod 22. The unloading mechanism 30 has a mounting seat 35 and a rotating shaft 36. The mounting seat 35 is installed in the notch 221. The rotating shaft 36 is installed on the mounting seat 35. The unloading knife 32 is rotatably set relative to the rotating shaft 36. Therefore, through the setting of the notch 221, it can match the setting of the connecting rod structure, and it is equivalent to embedding the mounting seat 35 in the notch 221, which can reduce the occupied space of the entire unloading mechanism 30.

[0056] Compared with the unloading mechanism 30 of the previous embodiment, the unloading mechanism 30 of this embodiment has the same structure as the frame 10, including a mounting frame 11 and a bracket 12. The mounting frame 11 is installed on the front beam 300 of the extruder, and a movable groove 121 is opened in the bracket 12. The shearing mechanism 20 passes through the bracket 12 along the axial direction of the shear cylinder 21, and the scissor rod 22 is arranged in the movable groove 121.

[0057] Furthermore, since the scissor rod 22 needs to perform telescopic movement in a linear direction and has a certain extension length, in order to ensure the movement stability of the scissor rod 22, the excess material cutting device 100 also includes a first guide member 40 and a second guide member 50 that are slidingly arranged. The first guide member 40 is arranged on the outer wall of the bracket 12, and the second guide member 50 is installed on the scissor rod 22, specifically, connected to the mounting seat 35, so that the movement of the scissor rod 22 in a linear direction can be limited by the arrangement of the first guide member 40 and the second guide member 50 that are slidingly arranged, thereby ensuring the stability of the movement.

[0058] In this embodiment, the first guide member 40 is a guide seat, and the second guide member 50 is a guide rod. In other embodiments, the first guide member 40 can also be configured as a guide rod, and the second guide member 50 can also be configured as a guide seat. It is understood that the configuration of the first guide member 40 and the second guide member 50 in the first embodiment is also applicable.

[0059] Further, see Figure 7A plurality of guide seats may be provided on the outer wall of the bracket 12 , and a plurality of guide rods may be provided on the mounting seat 35 , with one guide rod sliding relative to one guide seat, thereby further limiting the movement stability of the scissor lever 22 .

[0060] The above-mentioned residual material cutting device 100 is used in the following way: the shear cylinder 21 drives the scissor rod 22 to move downward, and the scissor rod 22 drives the scissors 23 to cut the residual material 400 on the front beam 300. At the same time, when the scissors 23 are moving to cut the residual material 400 on the front beam 300, the driving part 31 drives the unloading knife 32 to rotate, and the unloading knife 32, which was originally roughly in contact with the surface of the scissors 23, moves in a direction away from the scissors 23, thereby realizing the unloading of the residual material 400 cut off by the scissors 23.

[0061] The above-mentioned residual material cutting device 100 installs the driving cylinder on the wall surface of the scissor rod 22, and drives the unloading knife 32 to rotate through the connecting rod structure, so that the unloading knife 32 can be quickly subjected to force, thereby realizing the rapid unloading of the residual material 400. At the same time, since the driving cylinder is installed on the wall surface of the scissor rod 22, when maintenance is required, it can be quickly disassembled, the maintenance time is short, and the process is simple.

[0062] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A residual material removal device (100), used for removing residual material from the front beam of an extruder, characterized in that: include: A frame (10) is mounted on the front beam; A shearing mechanism (20) comprises a shearing cylinder (21), a scissor rod (22) and a pair of scissors (23); the shearing cylinder (21) is mounted on the frame (10); the scissor rod (22) is connected between the output shaft of the shearing cylinder (21) and the scissors (23), and is used to drive the scissors (23) to move under the drive of the shearing cylinder (21), so as to cut off the excess material on the front beam; A discharge mechanism (30) is mounted on the side wall of the scissor rod (22), and comprises a driving member (31), a discharge knife (32) and a movable connection structure (33). The movable connection structure (33) is connected between the driving member (31) and the discharge knife (32), so that the discharge knife (32) can be driven by the driving member (31) to move in a rotational manner, so that the discharge knife (32) can discharge the remaining material cut off by the scissors (23).

2. The excess material removal device (100) according to claim 1, characterized in that: The movable connection structure (33) is a slider, and a guide groove (321) is provided on the discharge knife (32). The slider is connected to the driving member (31) and is slidably arranged relative to the guide groove (321) so as to realize the rotation of the discharge knife (32) under the telescopic drive of the driving member (31).

3. The excess material removal device (100) according to claim 2, characterized in that: The discharge mechanism (30) further includes an elastic member (34), wherein the elastic member (34) is connected between the scissor rod (22) and the discharge knife (32) so as to apply an elastic force to the discharge knife (32).

4. The excess material removal device (100) according to claim 3, characterized in that: The discharge mechanism (30) further comprises a mounting seat (35) and a rotating shaft (36), wherein the mounting seat (35) is mounted on the scissor lever (22), the rotating shaft (36) is connected to the mounting seat (35) and is rotatably arranged with the discharge knife (32), and along the axial direction of the scissor lever (22), the elastic member (34) is arranged between the driving member (31) and the mounting seat (35).

5. The excess material removal device (100) according to any one of claims 2 to 4, characterized in that: The guide groove (321) is a waist-shaped hole formed on the discharge knife (32).

6. The excess material removal device (100) according to any one of claims 1 to 4, characterized in that: The driving member (31) is an electromagnet.

7. The excess material removal device (100) according to claim 1, characterized in that: The driving member (31) is an oil cylinder and is rotatably arranged relative to the scissor lever (22); The movable connection structure (33) is a connecting rod structure, comprising a first connecting rod (331) and a second connecting rod (332) that are arranged to rotate with each other, the other end of the first connecting rod (331) and the driving member (31) are arranged to rotate, and the other end of the second connecting rod (332) and the discharge knife (32) are arranged to rotate.

8. The excess material removal device (100) according to any one of claims 1 to 4 or 7, characterized in that: The frame (10) comprises a mounting frame (11) and a bracket (12); the mounting frame (11) is mounted on the front beam of the extruder; a movable groove (121) is provided in the bracket (12); the shearing mechanism (20) passes through the movable groove (121) along the axial direction of the shearing cylinder (21); and the scissor rod (22) is provided in the movable groove (121).

9. The excess material removal device (100) according to claim 8, characterized in that: One end of the scissor rod (22) on which the scissors (23) are mounted is provided with a notch (221); The discharge mechanism (30) further comprises a mounting seat (35) and a rotating shaft (36), wherein the mounting seat (35) is mounted on the notch (221), and the rotating shaft (36) is mounted on the mounting seat (35) and is rotatably arranged with the discharge knife (32).

10. The excess material removal device (100) according to claim 9, characterized in that: The excess material cutting device (100) further comprises a first guide member (40) and a second guide member (50) which are arranged to slide relative to each other, wherein the first guide member (40) is arranged on the outer wall of the bracket (12), and the second guide member (50) is installed on the scissor rod (22).

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