A punching device for producing mounting rails for electrical distribution boxes

Abstract

This application discloses a punching device for producing electrical distribution box mounting rails, relating to the field of stamping die technology. It includes a frame, with a stamping mechanism on the top surface of the frame for driving the stamping process. An upper die for downward pressing is fixedly connected to the output end of the stamping mechanism. Inside the frame is a separation mechanism for separating steel sheets. The separation mechanism includes a striking column for striking the upper die. This application utilizes the automatic triggering of the striking column to strike the lower platen during the rising phase of the lower platen, converting it into an instantaneous impact force to achieve non-destructive separation of the punch and the steel sheet. A piston plate is driven by a gear to reciprocate within an L-shaped cylinder, precisely delivering compressed gas to the nozzle to cool the punch, preventing overheating due to continuous stamping. It also removes debris from the surface of the punch and the steel sheet, keeping the processing area clean. This eliminates the leakage risk of the liquid cooling system in the prior art and simultaneously achieves cooling and debris removal, improving production efficiency and product quality.

Description

Technical Field

[0001] This application relates to the field of stamping die technology, and in particular to a punching device for producing electrical distribution box mounting rails. Background Technology

[0002] The punching device for distribution box mounting rails is a piece of equipment used to punch holes in distribution box mounting rails. Distribution box mounting rails are an important part of electrical installation equipment, and the holes on them are used to fix and connect various electrical components. This device can quickly and accurately punch the required holes in the mounting rails through an automated punching process to meet the needs of electrical installation.

[0003] After the mounting rail is stamped, the punch and the steel plate are prone to adsorption due to material deformation. Existing technologies mostly use independent cylinders for demolding, but cylinder demolding requires an additional power source, which increases the complexity of the equipment. In addition, in existing technologies, the punch temperature rises due to continuous stamping. Traditional cooling methods rely on external liquid cooling systems, which pose a risk of leakage. Furthermore, metal debris is prone to accumulate on the mold surface, requiring frequent shutdowns for cleaning. Utility Model Content

[0004] To address the issues of requiring an additional power source for cylinder demolding and the easy accumulation of metal debris on the mold surface, this application provides a punching device for producing electrical distribution box mounting rails.

[0005] The punching device for producing electrical distribution box mounting rails provided in this application adopts the following technical solution:

[0006] A punching device for producing mounting rails for electrical distribution boxes includes a frame, a punching mechanism for driving punching is provided on the top surface of the frame, an upper die for pressing down is fixedly connected to the output end of the punching mechanism, and a separation mechanism for separating steel sheets is provided inside the frame, the separation mechanism including a striking column for striking the upper die.

[0007] By adopting the above technical solution, the frame serves as the rigid foundation for supporting the entire device, ensuring stamping stability. The stamping mechanism provides the main driving force (such as a servo motor / hydraulic cylinder) to drive the upper die to complete the punching action. The upper die integrates the punch, which directly performs the punching of the steel plate. The separation mechanism is the core module used to solve the problem of the punch sticking to the steel plate. The striking column achieves zero-damage demolding through mechanical striking.

[0008] Preferably, the separation mechanism further includes a reset block fixedly connected inside the frame, a displacement block fixedly connected inside the frame, a rack fixedly connected inside the frame, and an auxiliary block fixedly connected to one side of the upper mold.

[0009] By adopting the above technical solution, the reset block and the displacement block constitute a mechanical logic switch to control the meshing timing of gear one. The rack is fixed to the frame and serves as the power track for gear drive. The auxiliary block is used to connect the upper mold and the transmission mechanism to transmit motion.

[0010] Preferably, the auxiliary block is rotatably connected to a rotating column, one side of the rotating column is fixedly connected to a limit plate, and the outer surface of the rotating column is slidably connected to a gear that meshes with the rack.

[0011] By adopting the above technical solution, the rotating column is the rotation axis of the gear, the limiting plate is used to constrain the axial displacement of the gear to prevent derailment, and the gear rotates when meshing with the rack, converting linear motion into rotation.

[0012] Preferably, a cylinder is fixedly connected to the side of the gear away from the auxiliary block and slidably connected to the outer surface of the rotating column, and an H-shaped connecting block is fixedly connected to the side of the cylinder away from the gear and slidably connected to the rotating column.

[0013] By adopting the above technical solution, the cylinder one and the H-shaped connecting block are used to transmit the rotational motion of the gear one to the sliding column one and the sliding column two, and realize bidirectional force transmission through the H-shaped structure.

[0014] Preferably, one side of the H-shaped connecting block is fixedly connected to a sliding post one that slides in cooperation with the displacement block, the side of the H-shaped connecting block away from the sliding post one is fixedly connected to a sliding post two that slides in cooperation with the reset block, and one side of the auxiliary block is fixedly connected to an auxiliary plate.

[0015] By adopting the above technical solution, the sliding column one slides along the displacement block to control the gear to disengage from the rack, the sliding column two slides along the reset block to release the gear engagement, and the auxiliary plate is used to support the subsequent striking trigger mechanism.

[0016] Preferably, a second cylinder is rotatably connected to the side of the auxiliary plate away from the auxiliary block, a rotating plate is rotatably connected to the inside of the auxiliary block, a cylinder is rotatably connected to the side of the rotating plate near the second cylinder and is slidably connected to the second cylinder, and a return spring sleeved on the outer surface of the second cylinder and the cylinder is fixedly connected between the auxiliary plate and the rotating plate.

[0017] By adopting the above technical solution, the second cylinder and the cylindrical column form a sliding connection to transmit the swing of the rotating plate. The return spring is an energy storage mechanism used to drive the rotating plate to return to its original position. The rotating plate is a lever-type energy amplification mechanism with the fulcrum being the axis of the auxiliary block.

[0018] Preferably, a wedge block is fixedly connected to the side of the rotating plate away from the cylinder, a push block that abuts against the wedge block is fixedly connected to the side of the rotating column away from the limiting plate, a striking column that abuts against the upper mold is fixedly connected to one side of the rotating plate, and an auxiliary mechanism is provided inside the auxiliary block.

[0019] By adopting the above technical solution, the push block rotates with the rotating column and impacts the inclined surface of the wedge block, converting the rotational energy into the instantaneous angular momentum of the rotating plate. The striking column is driven by the rotating plate and impacts the bottom of the upper mold vertically. The auxiliary mechanism is used to simultaneously blow air for cleaning during the impact.

[0020] Preferably, the auxiliary mechanism includes a rotating column 2 that is rotatably connected inside the auxiliary block. A gear 2 that meshes with the rack is fixedly connected to one side of the rotating column 2. A reciprocating screw is fixedly connected to the side of the rotating column 2 away from the gear 2. A nut is threaded onto the outer surface of the reciprocating screw. A connecting rod is symmetrically fixedly connected to one side of the nut.

[0021] By adopting the above technical solution, the rotating column two is a gear connecting to the reciprocating lead screw, the gear two is a mechanism drive device, and it rotates continuously when the upper mold is raised and lowered. The reciprocating lead screw and nut are used to convert the rotation of the gear two into the linear reciprocating motion of the nut.

[0022] Preferably, an L-shaped cylinder is fixedly connected to one side of the upper mold, a piston plate that slides with the L-shaped cylinder is fixedly connected to the side of the connecting rod away from the nut, an auxiliary cylinder that is fixedly connected and communicates with the L-shaped cylinder is fixedly connected through the inside of the auxiliary block, a plurality of nozzles are linearly arrayed on the arc surface of the auxiliary cylinder, and a connecting plate that is fixedly connected through the nozzles is fixedly connected to the bottom surface of the auxiliary block.

[0023] By adopting the above technical solution, the L-shaped cylinder is used to support the piston plate, the linear motion of the piston plate compresses the gas inside the L-shaped cylinder, and the gas is directionally sprayed to the root of the punch through the nozzle.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By utilizing the meshing design of the lower pressure plate and gear one, the action of the striking column striking the lower pressure plate is automatically triggered during the rising stage of the lower pressure plate. This design utilizes the kinetic energy in the stamping process and converts it into instantaneous impact force to achieve non-destructive separation of the punch and the steel plate. Compared with cylinder demolding, it avoids the problem of adding an additional power source.

[0026] 2. The piston plate driven by the gear two reciprocates inside the L-shaped cylinder, precisely delivering compressed gas to the nozzle. The ejected gas not only cools the punch to prevent it from overheating due to continuous punching, but also removes debris from the surface of the punch and steel plate, keeping the processing area clean. This eliminates the leakage risk of the liquid cooling system in the prior art and simultaneously achieves cooling and debris removal, improving production efficiency and product quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this application;

[0028] Figure 2 This is a schematic diagram of the connection relationship structure of the H-type connecting block in this application;

[0029] Figure 3 This is a schematic diagram of the connection structure of the rotating plates in this application;

[0030] Figure 4 This is a schematic diagram of the reciprocating lead screw connection structure of this application;

[0031] Figure 5 This is a schematic diagram of the internal structure of the L-shaped cylinder of this application.

[0032] Reference numerals: 1. Frame; 2. Stamping mechanism; 3. Upper die; 4. Lower die;

[0033] 51. Displacement block; 52. Reset block; 53. Rack; 54. Auxiliary block; 55. Rotating column one; 56. Limiting plate; 57. Gear one; 58. Cylinder one;

[0034] 59. Sliding column one; 510. Sliding column two; 511. H-shaped connecting block; 512. Push block; 513. Auxiliary plate; 514. Cylinder two; 515. Cylinder; 516. Return spring; 517. Rotating plate; 518. Wedge block; 519. Striking column;

[0035] 61. Gear II; 62. Rotating column II; 63. Reciprocating lead screw; 64. Nut; 65. Connecting rod; 66. L-shaped cylinder; 67. Auxiliary cylinder; 68. Connecting plate; 69. Nozzle; 610. Piston plate. Detailed Implementation

[0036] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0037] This application discloses a punching device for producing electrical distribution box mounting rails.

[0038] Reference Figure 1A punching device for producing mounting rails for electrical distribution boxes includes a frame 1. A punching mechanism 2 for driving punching is provided on the top surface of the frame 1. The output end of the punching mechanism 2 is fixedly connected to an upper mold 3. A punch is fixedly provided on the bottom surface of the upper mold 3. A lower mold 4 is fixedly connected to the bottom surface of the inner wall of the frame 1.

[0039] In use, the mounting rail to be punched is placed on the top surface of the lower die 4. Then, the upper die 3 is driven down by the stamping mechanism 2, so that the punch forms a hole on the surface of the mounting rail.

[0040] Reference Figure 2 The frame 1 is equipped with a separation mechanism, which includes a displacement block 51 fixedly connected to the top surface of the inner wall of the frame 1, and a reset block 52 fixedly connected to the bottom surface of the inner wall of the frame 1. The displacement block 51 has a sliding groove, and a slope is formed on the side of the sliding groove near the rack 53. The reset block 52 has a sliding groove, and a slope is formed on the side of the sliding groove away from the rack 53. The slopes are opposite in direction to each other. The top surface of the inner wall of the frame 1 is fixedly connected to the rack 53. The rack 53 has serrations on both sides. One side of the upper mold 3 is fixedly connected to an auxiliary block 54. The inner wall of the auxiliary block 54 is rotatably connected to a rotating column 55. The rotating column 55 is fixedly connected to a limiting plate 56 on the side near the rack 53. The outer surface of the rotating column 55 is slidably connected to a gear 57. Gear 57 meshes with rack 53. One side of gear 57 is fixedly connected to cylinder 58. Cylinder 58 is located on the side away from auxiliary block 54 and is slidably connected to the outer surface of rotating column 55. One side of cylinder 58 is fixedly connected to H-shaped connecting block 511. H-shaped connecting block 511 is located on the side away from gear 57 and is slidably connected to the outer surface of rotating column 55. The top of H-shaped connecting block 511 is fixedly connected to sliding column 59. Sliding column 59 is slidably engaged with the groove 1 opened in displacement block 51. The bottom of H-shaped connecting block 511 is fixedly connected to sliding column 510. Sliding column 510 is located on the side away from sliding column 59 and is slidably engaged with the groove 2 opened in reset block 52.

[0041] In use, when the upper mold 3 moves upward until the sliding column 59 contacts the inclined surface of the displacement block 51, the sliding column 59 slides into the groove as the upper mold 3 moves. This causes the sliding column 59 to drive the H-shaped connecting block 511, the cylinder 58, and the gear 57 to move towards the limiting plate 56. At this time, the gear 57 separates from the rack 53. When the upper mold 3 moves downward until the sliding column 510 contacts the inclined surface of the reset block 52, the sliding column 510 slides to the reset block. In the second slide groove opened by 52, when the second sliding column 510 enters the interior of the second slide groove, it will drive the H-shaped connecting block 511 to move towards the auxiliary block 54. The movement of the H-shaped connecting block 511 will drive the first cylinder 58, which is rotatably connected to the H-shaped connecting block 511, to move. The movement of the first cylinder 58 will drive the first gear 57, which is fixedly connected to the first cylinder 58, to move, so that the first gear 57 meshes with the rack 53. Therefore, when the upper mold 3 moves down, the first gear 57 will not rotate, and when the upper mold 3 moves up, the first gear 57 will rotate.

[0042] Reference Figure 3 The top surface of the auxiliary block 54 is fixedly connected to the auxiliary plate 513. One side of the auxiliary plate 513 is rotatably connected to the second cylinder 514, which is located away from the auxiliary block 54. The side of the auxiliary block 54 away from the rack 53 is rotatably connected to the rotating plate 517. One side of the rotating plate 517 is rotatably connected to the cylinder 515, which is located near the second cylinder 514 and is slidably connected inside the second cylinder 514. An annular groove can be provided on the inner wall of the second cylinder 514. A limit ring can be embedded at the end of the cylinder 515. When the cylinder 515 slides to its maximum stroke, the limit ring engages with the annular groove to limit its movement. A return spring is fixedly connected to the side of the auxiliary plate 513 near the second cylinder 514. 516, and the end of the return spring 516 away from the auxiliary plate 513 is fixedly connected to the side of the rotating plate 517 near the cylinder 515. The return spring 516 is sleeved on the outer surface of the cylinder 514 and the cylinder 515. One side of the rotating plate 517 is fixedly connected to the wedge block 518. The wedge block 518 is located on the side away from the cylinder 515. One side of the rotating column 55 is fixedly connected to the push block 512. The push block 512 is located on the side away from the limit plate 56, and the push block 512 abuts against the wedge block 518. The bottom end of the rotating plate 517 is fixedly connected to the striking column 519. The striking column 519 abuts against the upper mold 3. The striking column 519 is made of nylon material to provide flexible striking and prevent high-frequency fatigue damage to the stamping mechanism 2.

[0043] In use, as described above, when the upper mold 3 rises until the punch is completely withdrawn from the steel plate hole, the sliding column 510 disengages from the constraint of the reset block 52, and the gear 57 meshes with the rack 53. That is, when the upper mold 3 moves upward, it drives the gear 57 to rotate. The rotation of the gear 57 drives the rotating column 55, which is fixedly connected to the gear 57, to rotate. The rotation of the rotating column 55 drives the push block 512, which is fixedly connected to the rotating column 55, to rotate. When the push block 512 rotates, it pushes the wedge block 518 to move away from the auxiliary block 54. The rotating plate 517, which is fixedly connected to it, moves. The movement of the rotating plate 517 causes the cylinder 515, which is rotatably connected to it, to slide inside the cylinder 514 and squeeze the return spring 516. When the push block 512 does not push the wedge block 518, when the push block 512 rotates past the apex of the wedge block 518, the return spring 516 releases energy, thereby causing the rotating plate 517 to return to its original state, which in turn causes the striking column 519 to strike the upper mold 3. The kinetic energy in the stamping process is converted into an instantaneous impact force to achieve the non-destructive separation of the punch and the steel plate.

[0044] Reference Figures 4-5 The auxiliary block 54 is internally equipped with an auxiliary mechanism, which includes a rotating column 62 that is rotatably connected to the interior of the auxiliary block 54. The side of the rotating column 62 near the rack 53 is fixedly connected to a gear 61, and the gear 61 meshes with the rack 53. One side of the rotating column 62 is fixedly connected to a reciprocating screw 63, which is located away from the gear 61. The outer surface of the reciprocating screw 63 is threadedly connected to a nut 64, which contains balls and a reversing mechanism. One eccentric part of the nut 64 is fixedly connected to two connecting rods 65, which are located away from the auxiliary block 54. The side of the stamping mechanism 2 near the auxiliary block 54 is fixedly connected to an L-shaped cylinder 66. One side of the connecting rods 65 is fixedly connected to a piston plate 610. Located on the side away from nut 64, piston plate 610 is slidably connected inside L-shaped cylinder 66. A polytetrafluoroethylene sealing ring is added to the contact surface between piston plate 610 and L-shaped cylinder 66 to prevent gas leakage. The inner wall of auxiliary block 54 is fixedly connected to auxiliary cylinder 67. Auxiliary cylinder 67 is located below rotating column 62, and the arc surface of auxiliary cylinder 67 is fixedly connected to and communicates with the bottom end of L-shaped cylinder 66. Several nozzles 69 are linearly arrayed on the arc surface of the bottom end of auxiliary cylinder 67. The bottom surface of auxiliary block 54 is fixedly connected to connecting plate 68. Connecting plate 68 is located below auxiliary cylinder 67, and nozzles 69 are fixedly connected inside connecting plate 68. The nozzle axis of nozzle 69 is at a 15° elevation angle to the root of punch, and the array spacing of nozzles 69 is 1.2 times the diameter of punch.

[0045] In use, the up-and-down movement of the upper mold 3 drives the second gear 61 to move. Since the second gear 61 meshes with the rack 53, the second gear 61 rotates when it moves up and down. The rotation of the second gear 61 drives the rotation column 62, which is fixedly connected to the second gear 61, to rotate. The rotation of the rotation column 62 drives the reciprocating screw 63, which is fixedly connected to the rotation column 62, to rotate. The rotation of the reciprocating screw 63 drives the nut 64, which is threadedly connected to the reciprocating screw 63, to reciprocate on the outer surface of the reciprocating screw 63. The reciprocating movement of the nut 64 drives the nut 64, which is fixedly connected to the nut 64... The connecting rod 65 moves back and forth together, and the reciprocating movement of the connecting rod 65 drives the piston plate 610, which is fixedly connected to the connecting rod 65, to move back and forth inside the L-shaped cylinder 66. This pushes the air inside the L-shaped cylinder 66 into the auxiliary cylinder 67. The air source is self-generated compressed air, which is generated by the reciprocating motion of the piston plate 610 inside the L-shaped cylinder 66. There is no external air source or compressor. The air is discharged through the nozzle 69 to cool the punch and prevent it from overheating due to continuous punching. It can also remove debris from the surface of the punch and the steel plate and keep the processing area clean.

[0046] The implementation principle of the punching device for producing a distribution box mounting rail according to an embodiment of this application is as follows:

[0047] In use, the mounting rail to be punched is placed on the top surface of the lower die 4. Then, the upper die 3 is driven down by the stamping mechanism 2, so that the punch forms a hole on the surface of the mounting rail. When the upper die 3 moves upward until the sliding column 59 contacts the inclined surface of the displacement block 51, the sliding column 59 slides into the groove and causes the H-shaped connecting block 511, the cylinder 58 and the gear 57 to move together towards the limit plate 56. At this time, the gear 57 separates from the rack 53. Conversely, when the upper die 3 moves downward until the inclined surface of the sliding column 510 and the reset block 52 is formed... When in contact, the sliding column 510 slides into the groove 2 opened in the reset block 52. At this time, the gear 57 meshes with the rack 53. When the upper mold 3 moves upward, the gear 57 rotates. The rotation of the gear 57 drives the rotating column 55 and the push block 512 to rotate, thereby pushing the wedge block 518 to move away from the auxiliary block 54 and squeezing the reset spring 516. When the push block 512 does not push the wedge block 518, the reset spring 516 is not squeezed and is released, thereby driving the rotating plate 517 to return to its original state, thereby causing the striking column 519 to strike the upper mold 3, realizing the non-destructive separation of the punch and the steel plate.

[0048] As the upper mold 3 moves up and down, it drives the second gear 61 to rotate. The rotation of the second gear 61 drives the second rotating column 62 and the reciprocating screw 63 to rotate, causing the nut 64 to move back and forth on the outer surface of the reciprocating screw 63. This, in turn, drives the connecting rod 65 and the piston plate 610 to move back and forth inside the L-shaped cylinder 66, pushing the air inside the L-shaped cylinder 66 into the auxiliary cylinder 67 and discharging it through the nozzle 69. This cools the punch, preventing it from overheating due to continuous punching, and also removes debris from the surface of the punch and the steel plate, keeping the processing area clean.

[0049] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A punching device for producing mounting rails for electrical distribution boxes, characterized in that: The machine includes a frame (1), and a stamping mechanism (2) for driving the stamping is provided on the top surface of the frame (1). The output end of the stamping mechanism (2) is fixedly connected to an upper die (3) for pressing down. The machine is equipped with a separation mechanism for separating steel sheets inside the frame (1). The separation mechanism includes a striking column (519) for striking the upper die (3).

2. The punching device for producing mounting rails for distribution boxes according to claim 1, characterized in that: The separation mechanism also includes a reset block (52) fixedly connected inside the frame (1), a displacement block (51) fixedly connected inside the frame (1), a rack (53) fixedly connected inside the frame (1), and an auxiliary block (54) fixedly connected to one side of the upper mold (3).

3. The punching device for producing mounting rails for distribution boxes according to claim 2, characterized in that: The auxiliary block (54) is rotatably connected to a rotating column (55), and a limiting plate (56) is fixedly connected to one side of the rotating column (55). A gear (57) that meshes with the rack (53) is slidably connected to the outer surface of the rotating column (55).

4. The punching device for producing mounting rails for distribution boxes according to claim 3, characterized in that: The gear (57) is fixedly connected to a cylinder (58) that is slidably connected to the outer surface of the rotating column (55) on the side away from the auxiliary block (54). The cylinder (58) is fixedly connected to an H-shaped connecting block (511) that is slidably connected to the rotating column (55) on the side away from the gear (57).

5. The punching device for producing mounting rails for distribution boxes according to claim 4, characterized in that: One side of the H-shaped connecting block (511) is fixedly connected to a sliding post one (59) that slides in cooperation with the displacement block (51), and the side of the H-shaped connecting block (511) away from the sliding post one (59) is fixedly connected to a sliding post two (510) that slides in cooperation with the reset block (52). One side of the auxiliary block (54) is fixedly connected to an auxiliary plate (513).

6. The punching device for producing mounting rails for distribution boxes according to claim 5, characterized in that: The auxiliary plate (513) is rotatably connected to a second cylinder (514) on the side away from the auxiliary block (54). The auxiliary block (54) is rotatably connected to a rotating plate (517). The rotating plate (517) is rotatably connected to a cylinder (515) that is slidably connected to the second cylinder (514) on the side close to the second cylinder (514). A return spring (516) is fixedly connected between the auxiliary plate (513) and the rotating plate (517) and sleeved on the outer surface of the second cylinder (514) and the cylinder (515).

7. A punching device for producing mounting rails for distribution boxes according to claim 6, characterized in that: A wedge block (518) is fixedly connected to the side of the rotating plate (517) away from the cylinder (515). A push block (512) that abuts against the wedge block (518) is fixedly connected to the side of the rotating column (55) away from the limiting plate (56). A striking column (519) that abuts against the upper mold (3) is fixedly connected to one side of the rotating plate (517). An auxiliary mechanism is provided inside the auxiliary block (54).

8. The punching device for producing mounting rails for distribution boxes according to claim 7, characterized in that: The auxiliary mechanism includes a rotating column 2 (62) that is rotatably connected inside the auxiliary block (54). A gear 2 (61) that meshes with the rack (53) is fixedly connected to one side of the rotating column 2 (62). A reciprocating screw (63) is fixedly connected to the side of the rotating column 2 (62) away from the gear 2 (61). A nut (64) is threaded onto the outer surface of the reciprocating screw (63). A connecting rod (65) is symmetrically fixedly connected to one side of the nut (64).

9. A punching device for producing mounting rails for distribution boxes according to claim 8, characterized in that: An L-shaped cylinder (66) is fixedly connected to one side of the upper mold (3). A piston plate (610) that slides with the L-shaped cylinder (66) is fixedly connected to the side of the connecting rod (65) away from the nut (64). An auxiliary cylinder (67) that is fixedly connected to and communicates with the L-shaped cylinder (66) is fixedly connected through the inside of the auxiliary block (54). Several nozzles (69) are linearly arrayed on the arc surface of the auxiliary cylinder (67). A connecting plate (68) that is fixedly connected through the nozzles (69) is fixedly connected to the bottom surface of the auxiliary block (54).

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