Material belt levelness and tension adjusting mechanism for die-cutting machine

Abstract

The utility model discloses a material belt levelness and tension adjusting mechanism for a die-cutting machine, and relates to the technical field of die-cutting machine machining. The die comprises a workbench, a lower die is fixedly installed at the top of the workbench, an installation frame is fixedly installed at the top of the lower die, an upper die is arranged between the lower die and the installation frame, and a hydraulic cylinder used for driving the upper die to move up and down is fixedly installed at the top of the installation frame. If the material belt deviates, the driving assembly can drive any one second transmission assembly or any one first transmission assembly to operate, the first transmission assembly in operation can drive the corresponding guide roller assembly to move front and back, and the second transmission assembly in operation can drive the corresponding tensioning roller assembly to move front and back. The tensioning roller assemblies and the guide roller assemblies move front and back so that the corresponding part of the material belt can move front and back to a certain extent, and the offset material belt can be reset through joint cooperation of the two tensioning roller assemblies and the two guide roller assemblies.

Description

TECHNICAL FIELD

[0001] The utility model relates to die cutting machine processing technical field, concretely relates to a die cutting machine with material belt level and tension adjusting mechanism. BACKGROUND

[0002] The die cutting machine with material belt level and tension adjusting mechanism mainly functions to ensure that the material belt maintains stable level and proper tension during the die cutting process. By precisely adjusting the horizontal position of the material belt, it is accurately aligned with the die cutting knife die, thereby improving the die cutting precision. At the same time, the tension adjusting mechanism can maintain stable tension of the material belt during transmission, preventing die cutting deviation or material belt breakage caused by uneven tension. This mechanism is crucial for improving the overall quality and efficiency of die cutting operation and is an indispensable key component of the die cutting machine.

[0003] However, the existing adjusting mechanism for adjusting the level and tension of the material belt on the die cutting machine cannot timely correct the deviation of the material belt during actual use. If the deviation of the material belt cannot be timely corrected, it is easy to cause die cutting misalignment and generate waste. Therefore, the die cutting machine with material belt level and tension adjusting mechanism is proposed. SUMMARY

[0004] The utility model discloses a die cutting machine with material belt level and tension adjusting mechanism to solve the problem that the existing adjusting mechanism for adjusting the level and tension of the material belt on the die cutting machine cannot timely correct the deviation of the material belt during actual use.

[0005] The utility model discloses a die cutting machine with material belt level and tension adjusting mechanism to solve the problem that the existing adjusting mechanism for adjusting the level and tension of the material belt on the die cutting machine cannot timely correct the deviation of the material belt during actual use.

[0006] A die cutting machine with material belt level and tension adjusting mechanism, comprising a workbench, a lower die fixedly installed on the top of the workbench, an installation frame fixedly installed on the top of the lower die, an upper die arranged between the lower die and the installation frame, a hydraulic cylinder fixedly installed on the top of the installation frame for driving the upper die to move up and down, a guide roller assembly arranged on the left and right sides of the top of the workbench, a transmission assembly one arranged on the left and right sides of the top of the workbench for driving the corresponding guide roller assembly to move forward and backward, a tensioning roller assembly arranged on the left and right sides of the workbench, a transmission assembly two arranged on the left and right sides of the workbench for driving the corresponding tensioning roller assembly to move forward and backward, a drive assembly arranged on the back of the workbench for driving the transmission assembly one and the transmission assembly two to operate, and a deviation correcting assembly arranged on the left and right sides of the top of the workbench for detecting the deviation of the material belt.

[0007] Further, the guide roller assembly comprises hydraulic rods one, two hydraulic rods one are arranged on the left and right sides of the top of the workbench respectively, and the output ends of the two hydraulic rods one on the same side are fixedly connected with the guide roller.

[0008] Further, the transmission assembly one comprises a strip-shaped groove, a strip-shaped groove is arranged on the left and right sides of the top of the workbench respectively, a screw rod is movably arranged in each strip-shaped groove, a moving block is threadedly connected to each screw rod, a connecting rod one is fixedly arranged on the top of each moving block, each connecting rod one is fixedly connected with adjacent two hydraulic rods one, an electric telescopic rod one is fixedly arranged on one end of each screw rod, and a hexagonal sleeve one is fixedly connected to the output end of each electric telescopic rod one.

[0009] Further, the transmission assembly two comprises L-shaped rods, an L-shaped rod is fixedly arranged on the left and right sides of the workbench respectively, a threaded rod is movably arranged in each L-shaped rod, a convex block is threadedly connected to each threaded rod, a strip-shaped hole is arranged on the bottom of each L-shaped rod, the convex part of each convex block is movably arranged in the strip-shaped hole, a connecting rod two is fixedly arranged on the top of each convex block, each connecting rod two is fixedly connected with adjacent two hydraulic rods two, an electric telescopic rod two is fixedly arranged on one end of each threaded rod, and a hexagonal sleeve two is fixedly connected to the output end of each electric telescopic rod two.

[0010] Further, the driving assembly comprises an L-shaped frame, an L-shaped frame is fixedly arranged on the back of the workbench, a screw rod is movably arranged in the L-shaped frame, a convex block is threadedly connected to the screw rod, a long hole is arranged on the side wall of the L-shaped frame, the convex part of the convex block is movably arranged in the long hole, a servo motor for driving the convex block to rotate is fixedly arranged on one end of the L-shaped frame, an execution motor is fixedly arranged on the top of the convex block, and a hexagonal block is fixedly connected to the output end of the execution motor.

[0011] Further, the deviation rectifying assembly comprises a sliding groove, a sliding groove is arranged on the left and right sides of the top of the workbench respectively, a sliding block is movably arranged in each sliding groove, a hydraulic rod three is fixedly arranged on the top of each sliding block, a deviation rectifier is fixedly arranged on the output end of each hydraulic rod three, a long rod is fixedly arranged on the left and right sides of the top of the workbench, a U-shaped frame is fixedly arranged on the top of each sliding block, and a screw is threadedly connected to each U-shaped frame.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The utility model discloses a first material band is passed from the below of two groups of guide roller subassembly, simultaneously make material band from the above of two groups of tension roller subassembly, when die cutting to material band, only need to make material band intermittent sustainedly pass the middle of lower mould and upper mould, can control hydraulic cylinder and drive upper mould to move down every time when material band stops conveying, utilize lower mould and upper mould mutual cooperation to material band complete die cutting work, in order to avoid the deviation of material band in conveying simultaneously, therefore utilize two groups of deviation rectifying subassembly to material band edge place when material band is conveying and is detected, thereby real -time monitoring whether material band appears deviation, according to the detection result of material band deviation situation control drive assembly, if material band appears deviation utilizes drive assembly and can drive any one group transmission assembly two or any one group transmission assembly one and runs, transmission assembly one in operation can drive corresponding one group guide roller subassembly and move back and forth, transmission assembly two in operation can drive corresponding one group tension roller subassembly and move back and forth, and tension roller subassembly and guide roller subassembly move back and forth can all make corresponding part material band and move back and forth a certain displacement, through two groups of tension roller subassembly and two groups of guide roller subassembly common cooperation can make deviation material band and get reset. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the front view schematic drawing of the utility model;

[0015] Figure 2 It is the back view schematic drawing of the utility model;

[0016] Figure 3 It is the utility model Figure 1 A place of enlargement of the utility model;

[0017] Figure 4 It is guide roller subassembly schematic drawing of the utility model;

[0018] Figure 5 It is tension roller subassembly schematic drawing of the utility model;

[0019] Figure 6 It is drive assembly schematic drawing of the utility model;

[0020] Reference: 1, workbench; 2, lower die; 3, mounting frame; 4, hydraulic cylinder; 5, upper die; 6, guide roller assembly; 601, hydraulic rod one; 602, guide roller; 7, transmission assembly one; 701, strip-shaped groove; 702, screw rod; 703, moving block; 704, connecting rod one; 705, electric telescopic rod one; 706, hexagonal sleeve one; 8, tensioning roller assembly; 801, hydraulic rod two; 802, tensioning roller; 9, transmission assembly two; 901, L-shaped rod; 902, threaded rod; 903, convex block; 904, strip-shaped hole; 905, connecting rod two; 906, electric telescopic rod two; 907, hexagonal sleeve two; 10, driving assembly; 1001, L-shaped frame; 1002, screw rod; 1003, convex block; 1004, long strip-shaped hole; 1005, servo motor; 1006, execution motor; 1007, hexagonal block; 11, deviation rectifying assembly; 1101, sliding groove; 1102, sliding block; 1103, hydraulic rod three; 1104, deviation rectifier; 1105, long rod; 1106, U-shaped frame; 1107, bolt. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0023] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1 to 6 As shown, a material strip leveling and tension adjustment mechanism for a die-cutting machine includes a worktable 1. A lower die 2 is fixedly mounted on the top of the worktable 1, and a mounting frame 3 is fixedly mounted on the top of the lower die 2. An upper die 5 is disposed between the lower die 2 and the mounting frame 3. A hydraulic cylinder 4 for driving the upper die 5 to move up and down is fixedly mounted on the top of the mounting frame 3. Guide roller assemblies 6 are respectively disposed on the left and right sides of the top of the worktable 1. Transmission assembly 7 for driving the corresponding guide roller assembly 6 to move back and forth is respectively disposed on the left and right sides of the top of the worktable 1. Tension roller assemblies 8 are respectively disposed on the left and right sides of the worktable 1. Transmission assembly 9 for driving the corresponding tension roller assembly 8 to move back and forth is respectively disposed on the left and right sides of the worktable 1. A drive assembly 10 for driving transmission assembly 7 and transmission assembly 9 is disposed on the back of the worktable 1. A correction assembly 11 for detecting material strip deviation is disposed on the left and right sides of the top of the worktable 1. It should be noted that the material strip is first passed under the two sets of guide roller assemblies 6, and simultaneously passed over the two sets of tension roller assemblies 8. When die-cutting the strip, the strip only needs to intermittently pass between the lower die 2 and the upper die 5. Each time the strip stops conveying, the hydraulic cylinder 4 can be controlled to drive the upper die 5 to move downward. The lower die 2 and the upper die 5 work together to complete the die-cutting of the strip. In order to avoid the strip from shifting during conveying, two sets of correction components 11 are used to detect the edge of the strip while the strip is being conveyed, so as to monitor whether the strip has shifted in real time. Based on the detection result of the strip shift, the drive component 10 is controlled. If the strip shifts, the drive component 10 can drive any one set of transmission component 2 9 or any one set of transmission component 1 7 to run. The running transmission component 1 7 can drive the corresponding set of guide roller components 6 to move back and forth. The running transmission component 2 9 can drive the corresponding set of tension roller components 8 to move back and forth. The back and forth movement of tension roller components 8 and guide roller components 6 can make the corresponding part of the strip move back and forth to a certain extent. The shifted strip can be reset by the cooperation of the two sets of tension roller components 8 and the two sets of guide roller components 6.

[0026] like Figures 1 to 5As shown, the guide roller assembly 6 includes a hydraulic rod one 601, and the top of the workbench 1 is provided with two hydraulic rod ones 601 on the left and right sides, respectively, and the output ends of the two hydraulic rod ones 601 on the same side are fixedly connected with a guide roller 602. The tensioning roller assembly 8 includes a hydraulic rod two 801, and the left and right sides of the workbench 1 are provided with two hydraulic rod twos 801, respectively, and the output ends of the two hydraulic rod twos 801 on the same side are fixedly connected with a tensioning roller 802. It should be noted that when the material belt is passed from below the two guide roller assemblies 6, the material belt is passed from below the two guide rollers 602. In order to ensure that the material belt can be balanced for die cutting, the two hydraulic rod ones 601 on the same side can be controlled to lift the corresponding guide roller 602, so that the two guide rollers 602 have the same lifting height, and the material belt passes from above the two tensioning roller assemblies 8, that is, the material belt is passed from above the two tensioning rollers 802. In order to ensure that the material belt tension is suitable for die cutting, the two hydraulic rod twos 801 on the same side can be controlled to lift the corresponding tensioning roller 802, so that the two tensioning rollers 802 lift to control the tension of the material belt.

[0027] As shown in Figure 2 , Figure 4 The transmission assembly one 7 includes a strip-shaped groove 701, and the top of the workbench 1 is provided with a strip-shaped groove 701 on the left and right sides, respectively. The inside of each strip-shaped groove 701 is movably connected with a lead screw 702, and the lead screw 702 is threadedly connected with a moving block 703. The top of each moving block 703 is fixedly connected with a connecting rod one 704, and each connecting rod one 704 is fixedly connected with adjacent two hydraulic rod ones 601. One end of each lead screw 702 is fixedly connected with an electric telescopic rod one 705, and the output end of each electric telescopic rod one 705 is fixedly connected with a hexagonal sleeve one 706. It should be noted that by reciprocating the lead screw 702, the corresponding moving block 703, connecting rod one 704 and corresponding guide roller assembly 6 can be moved forward and backward, and the guide roller assembly 6 moved forward and backward can drive the corresponding part of the material belt to move forward and backward.

[0028] As shown in Figure 2 , Figure 4As shown, the transmission assembly two 9 includes L-shaped rods 901, and the left and right sides of the workbench 1 are respectively fixedly provided with L-shaped rods 901, and the inside of each L-shaped rod 901 is movably provided with a threaded rod 902, and the threaded rod 902 is threadedly connected with a convex block 903, and the bottom of each L-shaped rod 901 is provided with a strip-shaped hole 904, and the convex block 903 is movably arranged in the strip-shaped hole 904, and the top of each convex block 903 is fixedly provided with a connecting rod two 905, and each connecting rod two 905 is fixedly connected with two adjacent hydraulic rods two 801, and one end of each threaded rod 902 is fixedly provided with an electric telescopic rod two 906, and the output end of each electric telescopic rod two 906 is fixedly connected with a hexagonal sleeve two 907, and it should be noted that the threaded rod 902 is reciprocatingly rotated, so that the corresponding convex block 903, the connecting rod two 905 and the corresponding tension roller assembly 8 move forward and backward, and the tension roller assembly 8 moves forward and backward, which drives the corresponding part of the material belt to move forward and backward.

[0029] As shown in Figure 1 , Figure 2 , Figure 6 As shown, the driving assembly 10 includes an L-shaped frame 1001, and the back of the workbench 1 is fixedly provided with an L-shaped frame 1001, and the inside of the L-shaped frame 1001 is movably provided with a screw rod 1002, and the screw rod 1002 is threadedly connected with a convex block 1003, and the side wall of the L-shaped frame 1001 is provided with a long hole 1004, and the convex block 1003 is movably arranged in the long hole 1004, and one end of the L-shaped frame 1001 is fixedly provided with a servo motor 1005 for driving the convex block 1003 to rotate, and the top of the convex block 1003 is fixedly provided with an execution motor 1006, and the output end of the execution motor 1006 is fixedly connected with a hexagonal block 1007, and it should be noted that the servo motor 1005 is started, so that the screw rod 1002 is reciprocatingly rotated, so that the convex block 1003, the execution motor 1006 and the hexagonal block 1007 are linearly reciprocated, if it is required to reciprocatingly rotate the corresponding screw rod 702, the hexagonal block 1007 is aligned with the corresponding hexagonal sleeve one 706, then the corresponding electric telescopic rod one 705 is controlled to make the hexagonal sleeve one 706 connected therewith is sleeved on the hexagonal block 1007, then the execution motor 1006 is started, if it is required to reciprocatingly rotate the corresponding threaded rod 902, the hexagonal block 1007 is aligned with the corresponding hexagonal sleeve two 907, then the corresponding electric telescopic rod two 906 is controlled to make the electric telescopic rod two 906 connected therewith is sleeved on the hexagonal block 1007, then the execution motor 1006 is started.

[0030] As shown in Figure 1 , Figure 3As shown, the deviation rectifying assembly 11 comprises a sliding groove 1101, the top of the workbench 1 is provided with a sliding groove 1101 on the left and right sides respectively, a sliding block 1102 is movably installed in each sliding groove 1101, a hydraulic rod three 1103 is fixedly installed on the top of each sliding block 1102, a deviation rectifier 1104 is fixedly installed at the output end of each hydraulic rod three 1103, a long rod 1105 is fixedly installed on the top of the workbench 1 on the left and right sides respectively, a U-shaped frame 1106 is fixedly installed on the top of each sliding block 1102, and a bolt 1107 is threadedly connected to each U-shaped frame 1106, and it should be noted that the two hydraulic rod threes 1103 are controlled to be extended to a certain degree first, so that the two deviation rectifiers 1104 are lifted to a suitable height, then the two sliding blocks 1102 are moved respectively, so that each sliding block 1102 is moved to a suitable position in the corresponding sliding groove 1101, and then the two bolts 1107 are rotated to fix the current positions of the two sliding blocks 1102, so that the material belt passes through the interiors of the two deviation rectifiers 1104, thereby the deviation rectifier 1104 is used for detecting the deviation position of the material belt.

[0031] In summary:

[0032] Firstly, the material belt passes through below the two groups of guide roller assemblies 6, and simultaneously passes through above the two groups of tensioning roller assemblies 8, and when the material belt is die-cut, the material belt only needs to continuously pass through the middle of the lower die 2 and the upper die 5 intermittently, and each time when the material belt stops conveying, the upper die 5 can be controlled to move downwards by the hydraulic cylinder 4, and the lower die 2 and the upper die 5 are used for cooperating to complete the die-cutting work of the material belt, in order to avoid the deviation of the material belt during conveying, the two groups of deviation rectifying assemblies 11 are used for detecting the edges of the material belt during conveying, so that whether the material belt deviates is monitored in real time, and the driving assembly 10 is controlled according to the detection result of the deviation of the material belt, if the material belt deviates, the driving assembly 10 can drive any one of the two groups of transmission assemblies two 9 or any one of the two groups of transmission assemblies one 7 to operate, the transmission assembly one 7 in operation can drive the corresponding one of the two groups of guide roller assemblies 6 to move forwards and backwards, and the transmission assembly two 9 in operation can drive the corresponding one of the two groups of tensioning roller assemblies 8 to move forwards and backwards, and the forwards and backwards movements of the tensioning roller assemblies 8 and the guide roller assemblies 6 can make the corresponding part of the material belt move forwards and backwards by a certain distance, and the two groups of tensioning roller assemblies 8 and the two groups of guide roller assemblies 6 can cooperate to reset the deviated material belt.

[0033] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A mechanism for adjusting the level and tension of a die-cutting machine's strip, characterized in that, The workbench (1) includes a lower mold (2) fixedly installed on the top of the workbench (1), a mounting frame (3) fixedly installed on the top of the lower mold (2), an upper mold (5) set between the lower mold (2) and the mounting frame (3), a hydraulic cylinder (4) fixedly installed on the top of the mounting frame (3) for driving the upper mold (5) to move up and down, guide roller assemblies (6) are respectively set on the left and right sides of the top of the workbench (1), transmission assembly one (7) is respectively set on the left and right sides of the top of the workbench (1) for driving the corresponding guide roller assembly (6) to move back and forth, tension roller assemblies (8) are respectively set on the left and right sides of the workbench (1), transmission assembly two (9) is respectively set on the left and right sides of the workbench (1) for driving the corresponding tension roller assembly (8) to move back and forth, a drive assembly (10) is set on the back of the workbench (1) for driving the transmission assembly one (7) and the transmission assembly two (9) to run, and a correction assembly (11) for detecting the deviation of the material belt is set on the left and right sides of the top of the workbench (1).

2. The adjustment mechanism for the level and tension of the material strip for a die-cutting machine according to claim 1, characterized in that, The guide roller assembly (6) includes a hydraulic rod (601). Two hydraulic rods (601) are respectively arranged on the left and right sides of the top of the worktable (1). The output ends of the two hydraulic rods (601) on the same side are fixedly installed with a guide roller (602). The tension roller assembly (8) includes a hydraulic rod (801). Two hydraulic rods (801) are respectively arranged on the left and right sides of the worktable (1). The output ends of the two hydraulic rods (801) on the same side are fixedly installed with a tension roller (802).

3. The adjustment mechanism for the level and tension of the material strip for a die-cutting machine according to claim 2, characterized in that, The transmission component 1 (7) includes a strip groove (701). The top left and right sides of the worktable (1) are respectively provided with strip grooves (701). A lead screw (702) is movably installed inside each strip groove (701). A moving block (703) is threadedly connected to each lead screw (702). A connecting rod 1 (704) is fixedly installed on the top of each moving block (703). Each connecting rod 1 (704) is fixedly connected to two adjacent hydraulic rods 1 (601). An electric telescopic rod 1 (705) is fixedly installed at one end of each lead screw (702). A hexagonal sleeve 1 (706) is fixedly connected to the output end of each electric telescopic rod 1 (705).

4. The adjustment mechanism for the level and tension of the material strip for a die-cutting machine according to claim 2, characterized in that, The transmission component 2 (9) includes an L-shaped rod (901). The L-shaped rod (901) is fixedly installed on the left and right sides of the worktable (1). A threaded rod (902) is movably installed inside each L-shaped rod (901). A convex block (903) is threadedly connected to each threaded rod (902). A strip hole (904) is opened at the bottom of each L-shaped rod (901). The protrusion of each convex block (903) is movably installed inside the strip hole (904). A connecting rod 2 (905) is fixedly installed on the top of each convex block (903). Each connecting rod 2 (905) is fixedly connected to two adjacent hydraulic rods 2 (801). An electric telescopic rod 2 (906) is fixedly installed at one end of each threaded rod (902). A hexagonal sleeve 2 (907) is fixedly connected to the output end of each electric telescopic rod 2 (906).

5. The adjustment mechanism for the level and tension of the material strip for a die-cutting machine according to claim 1, characterized in that, The drive assembly (10) includes an L-shaped frame (1001). The L-shaped frame (1001) is fixedly installed on the back of the worktable (1). A screw (1002) is movably installed inside the L-shaped frame (1001). A protrusion (1003) is threaded onto the screw (1002). An elongated hole (1004) is opened on the side wall of the L-shaped frame (1001). The protrusion of the protrusion (1003) is movably installed inside the elongated hole (1004). A servo motor (1005) for driving the protrusion (1003) to rotate is fixedly installed at one end of the L-shaped frame (1001). An actuator motor (1006) is fixedly installed on the top of the protrusion (1003). A hexagonal block (1007) is fixedly connected to the output end of the actuator motor (1006).

6. The adjustment mechanism for the level and tension of the material strip for a die-cutting machine according to claim 1, characterized in that, The correction component (11) includes a slide groove (1101). The top left and right sides of the workbench (1) are respectively provided with slide grooves (1101). A slider (1102) is movably installed inside each slide groove (1101). A hydraulic rod (1103) is fixedly installed on the top of each slider (1102). A correction device (1104) is fixedly installed at the output end of each hydraulic rod (1103). Long rods (1105) are fixedly installed on the top left and right sides of the workbench (1). A U-shaped frame (1106) is fixedly installed on the top of each slider (1102). A bolt (1107) is threadedly connected to each U-shaped frame (1106).

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