An automatic welding machine for truss pipe processing

Abstract

The present invention relates to the technical field of truss processing, and discloses an automatic welding machine for truss pipe processing, comprising a workbench, a side of the workbench is fixedly connected to a welding table, the top of the workbench is provided with a slide groove, the middle of the workbench slide groove is fixedly connected to a limiting block, the top of the welding table is fixedly connected to a welding device, the interior of the workbench is movably connected to a moving mechanism, and the two sides of the top of the workbench are movably connected to a replacement mechanism; the truss pipe is placed in the fixed block, and the servo motor drives the moving block to move through a threaded rod, thereby adjusting the position of the fixed block to ensure the position accuracy between the two truss pipes, and the rotating wheel rotates synchronously when the moving block moves, and when the rotating wheel rotates, the two supporting shafts drive the rubber sheet inward to move after transmission through the output gear, the connecting gear, and the first bevel gear, thereby clamping the truss pipe and ensuring the position accuracy during truss pipe welding.

Description

Technical Field

[0001] The present invention relates to the technical field of truss processing, and more particularly to an automatic welding machine for truss pipeline processing. Background Art

[0002] A truss is a structure made up of rods connected at both ends with hinges. A truss is a plane or spatial structure generally consisting of triangular units and is composed of straight rods. Truss rods mainly bear axial tension or compression, thereby fully utilizing the strength of the material. Compared with solid beams, it can save material, reduce deadweight and increase rigidity when the span is large. This can give full play to the role of the material, save material and reduce the weight of the structure. Straight rods can also be solid steel structures or hollow pipe structures. Trusses composed of pipes are called pipe trusses.

[0003] During the construction of the pipe truss, the positioning and layout are first carried out on site. After the layout, the truss is welded and assembled. After assembly, the support frame is manufactured and installed, and the support is installed. Then, the hanging points of the pipe truss are prepared, and the pipe truss is hoisted as a whole. It is placed in the preset position and fixed with the support below to complete the installation. The traditional pipe truss has the following problems when welding:

[0004] When welding a truss, two workers are required to hold the base tube respectively. After ensuring the position and direction of the base tube, the auxiliary tube is welded to the side of the base tube to weld the truss. However, the two most basic tubes of the truss are held by two workers, which wastes manpower. In addition, the distance between the two tubes is also fixed by workers after measurement, so the position accuracy of the base tube cannot be guaranteed, thereby reducing the ultimate support performance of the truss.

[0005] When welding the pipes or tubes of a truss, the pipes are under pressure, so the pipes themselves are prone to shaking or slight rotation, which will change the welding position and thus reduce the mechanical properties of the truss. In addition, existing fixing devices cannot accurately fix truss pipes of different sizes. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the implementation regulations of the present invention provide an automatic welding machine for truss pipe processing to solve the technical problems raised in the background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: an automatic welding machine for truss pipe processing, comprising a workbench, a welding table fixedly connected to the side of the workbench, a slide groove provided on the top of the workbench, a limit block fixedly connected to the middle of the workbench slide groove, a welding device fixedly connected to the top of the welding table, a moving mechanism movably connected to the interior of the workbench, a replacement mechanism movably connected to both sides of the top of the workbench, a truss pipe placed on the top of the replacement mechanism, a fixing mechanism movably connected to the bottom end of the replacement mechanism, and a connecting block fixedly connected to the bottom end of the replacement mechanism;

[0008] The replacement mechanism includes a connecting base plate fixedly connected to the connecting block, a side of the connecting base plate is provided with a avoidance groove, a fixed shaft is fixedly connected in the avoidance groove of the connecting base plate, a clamping rod is movably sleeved on the side of the fixed shaft, a nut is threadedly connected to the side of the clamping rod away from the fixed shaft, and a fixed block is placed on the side of the connecting base plate close to the clamping rod;

[0009] The moving mechanism includes a servo motor for outputting power, a threaded rod is fixedly connected to the side of the servo motor, both ends of the side of the threaded rod are threadedly connected to moving blocks, and the side of the moving block is fixedly connected to the side of the connecting block;

[0010] The side of the connecting block is movably connected to a support shaft, the side of the support shaft is fixedly connected to a rotating wheel, the side of the rotating wheel away from the connecting block is fixedly connected to an output gear, the side of the output gear is movably connected to a connecting gear, the side of the connecting gear is fixedly connected to a connecting shaft, the middle part of the side of the connecting shaft is fixedly connected to a first bevel tooth, the top of the first bevel tooth is movably connected to a second bevel tooth, the top of the second bevel tooth is fixedly connected to a lower connecting rod, and the top of the lower connecting rod is provided with a mounting groove adapted to the clamping block.

[0011] In a preferred embodiment, a mounting groove adapted to the truss pipe is provided at the top of the replacement mechanism, and a support block adapted to the interior of the truss pipe is fixedly connected to the mounting groove of the replacement mechanism.

[0012] In a preferred embodiment, the threads at both ends of the side surface of the moving block are in opposite directions, and the threads on the side surface of the threaded rod are in a mirror-symmetrical relationship with respect to the center position of the moving block.

[0013] In a preferred embodiment, the bottom end of the rotating wheel and the top end of the connecting block are in the same horizontal plane, and the bottom end of the connecting gear is located two millimeters above the bottom end of the supporting shaft.

[0014] In a preferred embodiment, the side of the connecting shaft away from the connecting gear is movably connected to the side of the moving block, the side of the lower connecting rod is movably sleeved with a connecting plate, and the side of the lower connecting rod away from the lower connecting rod is fixedly connected to the side of the connecting block.

[0015] In a preferred embodiment, the top of the block is fixedly connected to an upper connecting rod, the top of the side of the upper connecting rod is fixedly connected to a rotating gear, racks are movably engaged on both sides of the rotating gear, the side of the rack is fixedly connected to a lifting fastener, and the top of the lifting fastener is fixedly connected to the side of the rotating gear near the rotating gear. A rubber sheet is fixedly connected.

[0016] In a preferred embodiment, an arc-shaped groove is provided inside the rubber sheet, and the rubber sheet is made of rubber. A sliding groove adapted to the limit plate is provided on the side of the rack away from the rotating gear, and the side of the limit plate away from the rack is fixedly connected to the inner side of the fixed block.

[0017] In a preferred embodiment, the diameter of the mounting groove at the top of the fixing block can be set to four groups, each group of fixing blocks cooperates with truss pipes of different sizes, and the length of the lifting block decreases as the diameter of the mounting groove in the fixing block increases.

[0018] The technical effects and advantages of the present invention are as follows:

[0019] 1. The present invention is equipped with a servo motor, a threaded rod, and a moving block. Two truss pipes are placed in two fixed blocks respectively. After the servo motor is started, the threaded rod causes the two moving blocks to move inward simultaneously. After the moving blocks move, the connecting block drives the replacement mechanism, thereby causing the fixed block to drive the truss pipe to move, thereby determining the position accuracy between the two truss pipes.

[0020] 2. The present invention is provided with a support shaft, an output gear, a rotating gear, and a rack. When the moving block moves, it drives the support shaft and the rotating wheel to rotate, and the support shaft drives the output gear to rotate. When the output gear rotates, the lower connecting rod rotates through the connecting gear, the first bevel gear, and the second bevel gear. The lower connecting rod drives the upper clamping block to rotate. After the clamping block is driven by the upper connecting rod, the rotating gear, and the rack, the lifting fast drives the rubber sheet to squeeze toward the truss pipe, thereby fixing the position of the truss pipe. When the position of the truss pipe is fixed, the rotating wheel will not rotate and will slide and rub relative to the workbench. Therefore, it only fixes the position of the truss pipe without causing damage to the equipment.

[0021] 3. The present invention is provided with a connecting base plate, a clamping rod, a nut, and a fixed block. After the fixed block is docked with the connecting base plate, the two clamping rods are rotated into the limiting grooves on both sides of the fixed block, and the nuts are threadedly connected to the clamping rods. Therefore, the two clamping rods and the nuts can limit the position of the fixed block, so that different fixed blocks can be freely connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention.

[0024] Figure 3 Schematic diagram of the mobile mechanism of the present invention.

[0025] Figure 4 It is a schematic diagram of the combination of the replacement structure and the fixing mechanism of the present invention.

[0026] Figure 5 It is an exploded schematic diagram of the replacement mechanism of the present invention.

[0027] Figure 6 Schematic diagram of the fixing mechanism of the present invention.

[0028] Figure 7 It is a schematic diagram of the lower structure of the fixing mechanism of the present invention.

[0029] Figure 8 It is a schematic diagram of the upper structure of the fixing mechanism of the present invention.

[0030] Figure 9 This is a schematic diagram of the structure of multiple groups of fixed blocks of the present invention.

[0031] The accompanying drawings are marked as follows: 1. workbench; 2. welding table; 3. welding device; 4. limit block; 5. replacement mechanism; 501. connecting base plate; 502. fixed shaft; 503. clamping rod; 504. nut; 505. fixed block; 6. truss pipe; 7. moving mechanism; 701. servo motor; 702. threaded rod; 703. moving block; 8. fixing mechanism; 801. support shaft; 802. rotating wheel; 803. output gear; 804. connecting gear; 805. connecting shaft; 806. first bevel gear; 807. second bevel gear; 808. lower connecting rod; 809. connecting plate; 810. clamping block; 811. upper connecting rod; 812. rotating gear; 813. rack; 814. lifting fast; 815. rubber sheet; 816. limit plate; 9. connecting block. DETAILED DESCRIPTION

[0032] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The automatic welding machine for truss pipe processing involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work fall within the scope of protection of the present invention.

[0033] Reference Figure 1-5 The present invention provides an automatic welding machine for truss pipe processing, comprising a workbench 1, a welding table 2 is fixedly connected to the side of the workbench 1, a slide groove is provided at the top of the workbench 1, a limiting block 4 is fixedly connected to the middle of the slide groove of the workbench 1, a welding device 3 is fixedly connected to the top of the welding table 2, a moving mechanism 7 is movably connected inside the workbench 1, a changing mechanism 5 is movably connected to both sides of the top of the workbench 1, a mounting groove adapted to the truss pipe 6 is provided at the top of the changing mechanism 5, a supporting block adapted to the inside of the truss pipe 6 is fixedly connected in the mounting groove of the changing mechanism 5, a truss pipe 6 is placed on the top of the changing mechanism 5, a fixing mechanism 8 is movably connected to the bottom end of the changing mechanism 5, and a connecting block 9 is fixedly connected to the bottom end of the changing mechanism 5;

[0034] The replacement mechanism 5 includes a connecting base plate 501 fixedly connected to the connecting block 9, and a avoidance groove is provided on the side of the connecting base plate 501. A fixed shaft 502 is fixedly connected in the avoidance groove of the connecting base plate 501, and a clamping rod 503 is movably sleeved on the side of the fixed shaft 502. The side of the clamping rod 503 away from the fixed shaft 502 is threadedly connected with a nut 504, and a fixed block 505 is placed on the side of the connecting base plate 501 close to the clamping rod 503.

[0035] Through the above technical solution, when the present application is in use, the connecting substrate 501 is fixed to the entire device, and the fixing block 505 and the connecting substrate 501 are originally in a state of being separated from each other. When the connecting substrate 501 contacts the fixing block 505, the two clamping rods 503 are respectively turned into the installation grooves opened on both sides of the fixing block 505, and the nuts 504 are connected to the clamping rods 503. At this time, the nuts 504 and the fixing blocks 505 are in contact, thereby clamping the position of the fixing block 505, and both clamping rods 503 need to be inserted into the installation grooves of the fixing blocks 505 to ensure that the position of the fixing blocks 505 will not shift during installation. A support block is provided at the top of the replacement mechanism 5, so that the inner side of the truss pipe 6 is supported by the support block, and the replacement mechanism 5 and the support block can ensure that the truss pipe 6 will not tip over.

[0036] Reference Figure 3 The moving mechanism 7 includes a servo motor 701 for outputting power. The side of the servo motor 701 is fixedly connected to a threaded rod 702. The two ends of the side of the threaded rod 702 are threadedly connected to a moving block 703. The side of the moving block 703 is fixedly connected to the side of the connecting block 9. The threads at the two ends of the side of the moving block 703 are in opposite directions. The threads on the side of the threaded rod 702 are mirror-symmetrical about the center position of the moving block 703.

[0037] In the embodiment of the present application, after the servo motor 701 is started, it will drive the threaded rod 702 to rotate. When the threaded rod 702 rotates, it will drive the moving blocks 703 on both sides to move. Since the threads on the sides of the threaded rod 702 are in opposite directions, when the threaded rod 702 rotates, the two moving blocks 703 will move toward or in the opposite direction, so that the position between the two moving blocks 703 can be accurately controlled, and then the position accuracy between the truss pipes 6 can be controlled, thereby automatically adjusting the distance between the truss pipes 6. In addition, it should be noted that the bottom end of the moving block 703 will be provided with the following Figure 2 The bottom plate shown in FIG. 7A is thus limited in position to ensure that it can move when the threaded rod 702 is rotated.

[0038] Reference Figure 6 、 Figure 7 and Figure 8 The side of the connecting block 9 is movably connected with a support shaft 801, and the side of the support shaft 801 is fixedly connected with a rotating wheel 802. The rotating wheel 802 is fixedly connected to the side away from the connecting block 9 with an output gear 803. The bottom end of the rotating wheel 802 is in the same horizontal plane as the top of the connecting block 9. The bottom end of the connecting gear 804 is located two millimeters above the bottom end of the support shaft 801. The side of the output gear 803 is movably connected with a connecting gear 804. The side of the connecting gear 804 is fixedly connected with a connecting shaft 805. The middle part of the side of the connecting shaft 805 is fixedly connected with a first bevel gear 806. The top of the first bevel gear 806 is movably connected with a second bevel gear 807. The top of the second bevel gear 807 is fixedly connected with a lower connecting rod 808. The top of the lower connecting rod 808 is provided with a mounting groove adapted to the block 810. The connecting shaft 805 is away from the connecting gear 804. The side is movably connected to the side of the moving block 703, and the side of the lower connecting rod 808 is movably sleeved with a connecting plate. The side of the lower connecting rod 808 away from the lower connecting rod 808 is fixedly connected to the side of the connecting block 9, the top of the blocking block 810 is fixedly connected to the upper connecting rod 811, and the top of the side of the upper connecting rod 811 is fixedly connected to the rotating gear 812. The two sides of the rotating gear 812 are movably engaged with the rack 813, and the side of the rack 813 is fixedly connected to the lifting fastener 814. The top of the lifting fastener 814 is fixedly connected to the side of the rotating gear 812 near the rotating gear 812. The rubber sheet 815 has an arc groove inside, and the rubber sheet 815 is made of rubber. The side of the rack 813 away from the rotating gear 812 is provided with a sliding groove adapted to the limit plate 816, and the side of the limit plate 816 away from the rack 813 is fixedly connected to the inner side of the fixed block 505.

[0039] In the embodiment of the present application, when the moving block 703 moves, it will drive the support shaft 801 to move. When the support shaft 801 moves, the rotating wheel 802 will rotate. When the rotating wheel 802 rotates, it will drive the rotating wheel 802 to rotate and drive the output gear 803 on the side to rotate. When the output gear 803 rotates, it will drive the connecting shaft 805 to rotate through the connecting gear 804. When the connecting shaft 805 rotates, it will drive the lower connecting rod 808 to rotate through the second bevel gear 807. When the lower connecting rod 808 rotates, it will drive the internal block 810 to rotate. Since the block 810 and the connecting plate 809 cooperate with each other, the lower connecting rod 808 will only drive the block 810 to rotate. Therefore, when replacing The fixing block 505 four, the fixing block 505 only needs to be inserted into the block 810. When the block 810 rotates, it will drive the upper connecting rod 811 to rotate. When the upper connecting rod 811 rotates, it will drive the rack 813 to move by rotating the gear 812. When the rack 813 moves, it drives the rubber sheet 815 to move. The two rubber sheets 815 move inward at the same time, thereby fixing the position of the truss pipe 6. When the position of the truss pipe 6 is fixed, the rubber sheet 815 cannot move, and the rotating gear 812 will not rotate. At this time, the rotating gear 812 will not rotate either. The rotating gear 812 slides and rubs with the bottom plate, and the sliding friction provides pressure when the rubber sheet 815 is clamped.

[0040] Reference Figure 9 The diameter of the mounting groove at the top of the fixing block 505 can be set to four groups, and each group of fixing blocks 505 cooperates with truss pipes 6 of different sizes. The length of the lifting fast 814 decreases as the diameter of the mounting groove in the fixing block 505 increases.

[0041] In the embodiment of the present application, when the size of the truss pipe 6 is different, the fixing block 505 can be replaced. After the fixing block 505 is replaced, it can adapt to different truss pipes 6, so that different truss pipes 6 can be welded, and the lifting block 814 in the fixing block 505 is adjusted along with the installation groove at the top of the fixing block 505, so that the truss pipes 6 of different sizes can be clamped.

[0042] Working principle of the present invention:

[0043] The present invention mainly solves the problem of position accuracy and fixation during truss welding, and the problem that trusses of different sizes cannot be fixed using the same equipment;

[0044] To address the fixation issue during truss welding, when the truss is welded, first place the two basic truss pipes 6 into the fixed block 505. At this time, the servo motor 701 is started, which drives the threaded rod 702 to rotate. When the threaded rod 702 rotates, the moving blocks 703 on both sides move synchronously. When the moving blocks 703 move, they drive the replacement mechanism 5 to move as a whole through the connecting block 9, thereby controlling the position accuracy between the two truss pipes 6.

[0045] In order to solve the problem of fixing the truss pipe 6 during welding, the moving block 703 will drive the support shaft 801 to move when it moves, and the rotating wheel 802 on the side of the support shaft 801 will contact the ground and rotate. At this time, it will drive the output gear 803 to rotate. When the output gear 803 rotates, it will drive the connecting shaft 805 to rotate through the connecting gear 804. When the connecting shaft 805 rotates, it will cause the lower connecting rod 808 to rotate through the first bevel gear 806 and the second bevel gear 807. When the lower connecting rod 808 rotates, it will drive the upper connecting rod 811 and the rotating gear 812 to rotate through the clamping block 810 above it. When the rotating gear 812 rotates, it drives the racks 813 on both sides to move. The movement of the two racks 813 will drive the two lifting fasteners 814 to move. The lifting fasteners 814 drive the rubber sheet 815 to move, thereby squeezing the truss pipe 6 inward, fixing the position of the truss pipe 6, and ensuring that the truss pipe 6 does not shake or rotate during welding;

[0046] To address the problem that truss pipes 6 of different sizes cannot be adapted to the same device, the fixed block 505 of the present application can be separated from the workbench 1 or the fixing mechanism 8. At this time, fixed blocks 505 of different sizes can be replaced, and the clamping block 810 below the fixed block 505 is inserted into the lower connecting rod 808, and the side of the fixed block 505 is in contact with the connecting base plate 501. At this time, the two clamping rods 503 are rotated into the installation groove of the fixed block 505, and the nut 504 is connected to the clamping rod 503 to clamp the fixed block 505. Therefore, different fixed blocks 505 can be selected for truss pipes 6 of different sizes.

[0047] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0048] Secondly: The drawings of the embodiments disclosed in the present invention only involve structures related to the implementation regulations of the present disclosure. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention can be combined with each other;

[0049] Finally: The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic welding machine for truss pipe processing, comprising a workbench (1), characterized in that: The side of the workbench (1) is fixedly connected to a welding table (2), the top of the workbench (1) is provided with a slide groove, the middle of the slide groove of the workbench (1) is fixedly connected to a limit block (4), the top of the welding table (2) is fixedly connected to a welding device (3), the interior of the workbench (1) is movably connected to a moving mechanism (7), the two sides of the top of the workbench (1) are movably connected to a replacement mechanism (5), a truss pipe (6) is placed on the top of the replacement mechanism (5), the bottom of the replacement mechanism (5) is movably connected to a fixing mechanism (8), and the bottom of the replacement mechanism (5) is fixedly connected to a connecting block (9); The replacement mechanism (5) comprises a connection base plate (501) fixedly connected to the connection block (9); a side of the connection base plate (501) is provided with a position-avoiding groove; a fixed shaft (502) is fixedly connected in the position-avoiding groove of the connection base plate (501); a clamping rod (503) is movably sleeved on the side of the fixed shaft (502); a nut (504) is threadedly connected to the side of the clamping rod (503) away from the fixed shaft (502); and a fixing block (505) is placed on the side of the connection base plate (501) close to the clamping rod (503); The moving mechanism (7) comprises a servo motor (701) for outputting power, a threaded rod (702) being fixedly connected to a side surface of the servo motor (701), a moving block (703) being threadedly connected to both ends of a side surface of the threaded rod (702), and a side surface of the moving block (703) being fixedly connected to a side surface of a connecting block (9); The side of the connecting block (9) is movably connected to a support shaft (801), the side of the support shaft (801) is fixedly connected to a rotating wheel (802), the side of the rotating wheel (802) away from the connecting block (9) is fixedly connected to an output gear (803), the side of the output gear (803) is movably connected to a connecting gear (804), the side of the connecting gear (804) is fixedly connected to a connecting shaft (805), the middle part of the side of the connecting shaft (805) is fixedly connected to a first bevel gear (806), the top end of the first bevel gear (806) is movably connected to a second bevel gear (807), the top end of the second bevel gear (807) is fixedly connected to a lower connecting rod (808), and the top end of the lower connecting rod (808) is provided with a mounting groove adapted to the clamping block (810); The side of the connecting shaft (805) away from the connecting gear (804) is movably connected to the side of the moving block (703), the side of the lower connecting rod (808) is movably sleeved with a connecting plate (809), and the side of the lower connecting rod (808) away from the lower connecting rod (808) is fixedly connected to the side of the connecting block (9); The top of the clamping block (810) is fixedly connected to an upper connecting rod (811), the top of the side of the upper connecting rod (811) is fixedly connected to a rotating gear (812), both sides of the rotating gear (812) are movably engaged with racks (813), the side of the rack (813) is fixedly connected to a lifting block (814), and the top of the lifting block (814) is fixedly connected to the side of the rotating gear (812) near the rotating gear (812) with a rubber sheet (815).

2. The automatic welding machine for truss pipe processing according to claim 1, characterized in that: The top of the replacement mechanism (5) is provided with a mounting groove adapted to the truss pipe (6), and a support block adapted to the interior of the truss pipe (6) is fixedly connected to the mounting groove of the replacement mechanism (5).

3. The automatic welding machine for truss pipe processing according to claim 1, characterized in that: The threads at both ends of the side surface of the moving block (703) are in opposite directions, and the threads on the side surface of the threaded rod (702) are in a mirror-symmetrical relationship with respect to the center position of the moving block (703).

4. The automatic welding machine for truss pipe processing according to claim 1, characterized in that: The bottom end of the rotating wheel (802) is in the same horizontal plane as the top end of the connecting block (9), and the bottom end of the connecting gear (804) is located two millimeters above the bottom end of the supporting shaft (801).

5. The automatic welding machine for truss pipe processing according to claim 1, characterized in that: An arc-shaped groove is provided inside the rubber sheet (815), and the rubber sheet (815) is made of rubber. A sliding groove adapted to the limiting plate (816) is provided on the side of the rack (813) away from the rotating gear (812). The side of the limiting plate (816) away from the rack (813) is fixedly connected to the inner side of the fixed block (505).

6. The automatic welding machine for truss pipe processing according to claim 1, characterized in that: The diameter of the mounting groove at the top of the fixing block (505) can be set to four groups, and each group of fixing blocks (505) is respectively matched with truss pipes (6) of different sizes. The length of the lifting block (814) decreases as the diameter of the mounting groove in the fixing block (505) increases.

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