Safety limiting mechanism of laser pipe cutting machine and limiting method thereof

Abstract

The application discloses a laser pipe cutting machine safety limiting mechanism and a limiting method thereof, which is used for limiting a cutting head sliding on a slide. The safety limiting mechanism comprises a mechanical stopper arranged on a running path of the cutting head. The mechanical stopper is internally provided with a piston inner cavity. A piston rod is inserted into the piston inner cavity. A piston sheet is connected to an insertion end of the piston rod. A through hole is arranged in the piston sheet. A connecting rod is arranged in the piston inner cavity along a running track of the piston sheet. A transition section one, a transition section two and a transition section three are sequentially arranged on the connecting rod along a running direction of the piston sheet. The transition section one, the transition section two and the transition section three are arranged on the connecting rod. The kinetic energy of the cutting head is absorbed by the piston sheet through the transition section one, the transition section two and the transition section three in sequence by changing the throttling area of the medium channel. Thus, the kinetic energy of the cutting head is absorbed during the sliding process, and the cutting head can be stopped at the end face of the mechanical stopper.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of limiting, and particularly relates to a safety limiting mechanism of a laser pipe cutting machine and a limiting method of the safety limiting mechanism of the laser pipe cutting machine. BACKGROUND

[0002] With the development of manufacturing industry, automatic and intelligent devices are applied more and more widely. In the metal processing industry, laser cutting is favored due to its high precision, high speed and strong adaptability. For pipe cutting, the laser pipe cutting machine becomes one of the mainstream devices. However, in the process of use, due to improper operation or mechanical failure, the cutting head may exceed the predetermined range, thereby damaging the device or causing safety accidents.

[0003] In the prior art, mechanical blocks are generally installed at both ends of the motion track of the cutting head, and when the cutting head approaches the limit position, the blocks will physically stop it from continuing to advance. However, the cutting head still has a certain speed when sliding towards the mechanical block, and thus will carry a certain kinetic energy to collide with the mechanical block, causing the position of the mechanical block to retreat, which is not conducive to multiple limiting. SUMMARY

[0004] The present application provides a safety limiting mechanism of a laser pipe cutting machine and a limiting method thereof to solve the above technical problems.

[0005] The specific technical solutions are as follows:

[0006] On the one hand, the present application provides a safety limiting mechanism of a laser pipe cutting machine for limiting a cutting head sliding on a slide, which comprises a mechanical block arranged on the running path of the cutting head, the mechanical block has a piston inner cavity, a piston rod is inserted into the piston inner cavity, the insertion end of the piston rod is connected with a piston sheet, a through hole is formed in the piston sheet, a connecting rod is arranged in the piston inner cavity along the running track of the piston sheet, the connecting rod is sequentially provided with a transition section one, a transition section two and a transition section three along the running direction of the piston sheet, the piston sheet is driven by the cutting head to slide in the piston inner cavity and make the through hole pass through the transition section one, the transition section two and the transition section three in sequence to adjust the throttling area of the medium passage.

[0007] A plurality of ring pieces are equidistantly arranged on the transition section one of the connecting rod; the ring piece and the through hole have a gap therebetween when they meet.

[0008] As a further technical solution of the present application, the transition section two of the connecting rod has a radially extending plunger, the plunger and the through hole have a gap therebetween when they meet, and a plurality of groups of the plungers are laid along the running path of the piston sheet.

[0009] The mechanical stopper is internally provided with a piston outer cavity, a piston head is slidably arranged in the piston outer cavity and divides the piston outer cavity into two energy absorption cavities, the piston head comprises two spaced apart baffle plates, the two baffle plates cooperate with the piston outer cavity to form a piston inner cavity, a connecting rod is connected between the two piston inner cavities, and the energy absorption cavities are both provided with energy absorption medium.

[0010] As a further technical scheme of the present application, the axial length of the plunger increases along the advancing direction of the piston plate, and the spacing between the adjacent two plungers decreases.

[0011] As a further technical scheme of the present application, the energy absorption medium in the energy absorption cavities is one or a combination of gas and solid.

[0012] As a further technical scheme of the present application, the transition section three is provided with a stop head, and the stop head is conical.

[0013] As a further technical scheme of the present application, the laser transmitter is further provided, and the laser transmitter and the mechanical stopper are sequentially arranged along the advancing direction of the cutting head, the laser transmitter is arranged on one side of the slide, the other side of the slide is provided with a laser receiver matched with the laser transmitter, the laser receiver is in communication connection with the power system of the cutting head, and the mechanical stopper is arranged on the slide.

[0014] As a further technical scheme of the present application, the mechanical stopper is provided with a spacer pad on the end face facing the cutting head.

[0015] On the other hand, the present application further provides a limiting method of the safety limiting mechanism of the laser pipe cutting machine, and the specific steps are as follows:

[0016] S1, cutting off the power source;

[0017] The laser receiver is started, the output end of the laser transmitter emits laser to the laser receiver and forms a laser interception channel on the path of the slide, when the cutting head moves to the laser channel and blocks the laser, the laser receiver emits an electric signal to the power system of the cutting head and controls the power system of the cutting head to be closed;

[0018] S2, point brake;

[0019] The cutting head contacts the piston rod and drives the piston plate to pass through the transition section one of the connecting rod, when the piston plate passes through the transition section one, the perforations alternately pass through the connecting rod and the ring plate, and the ring plate meets the perforations to reduce the throttling area to realize the rhythmic point brake;

[0020] S3, alternate energy absorption;

[0021] When the piston piece passes through the transition section two on the connecting rod, the perforation alternately passes through the connecting rod and the plunger, when the perforation passes through the connecting rod, the damping liquid in the piston cavity absorbs energy through the medium channel between the connecting rod and the perforation, when the perforation passes through the plunger, the whole piston head is driven to move downward and the energy absorption medium in the energy absorption cavity two and the energy absorption cavity one is forced to change to realize energy absorption.

[0022] S4, stop;

[0023] When the perforation passes through the stop head, with the continuous movement of the perforation, the throttling area of the medium channel between the perforation and the stop head gradually decreases until the cutting head stops.

[0024] The beneficial effects of the present application are:

[0025] In the present application, the transition section one, the transition section two and the transition section three are arranged on the connecting rod, the kinetic energy of the cutting head is absorbed by the piston piece passing through the transition section one, the transition section two and the transition section three in turn, so that the kinetic energy of the cutting head is absorbed in the sliding process, and the cutting head can be stopped at the end face of the mechanical stop block. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structure schematic diagram of the laser pipe cutting machine safety limiting mechanism after installation is shown;

[0027] Figure 2 A structure schematic diagram of the mechanical stop block is shown;

[0028] Figure 3 A structure schematic diagram of the piston head is shown;

[0029] Figure 4 A structure schematic diagram of the transition section one is shown;

[0030] Figure 5 A structure schematic diagram of the transition section two is shown;

[0031] Figure 6 A structure schematic diagram of the transition section three is shown.

[0032] Reference signs:

[0033] 100, slide; 200, cutting head; 300, laser emitter; 310, laser receiver; 400, mechanical stopper; 410, piston outer cavity; 420, piston head; 421, spacer; 422, piston inner cavity; 423, connecting rod; 424, piston sheet; 425, perforation; 430, energy absorption cavity I; 440, energy absorption cavity II; 450, piston rod; 460, spacer; 510, transition section I; 511, ring sheet; 520, transition section II; 521, plunger; 530, transition section III; 531, stop head. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments.

[0035] Figure 1 A structure schematic diagram of the laser pipe cutting machine safety limiting mechanism after installation is shown; Figure 1 In the present application, the laser pipe cutting machine safety limiting mechanism is used for limiting the cutting head 200 sliding on the slide 100, which comprises the laser emitter 300 and the mechanical stopper 400 arranged in sequence along the direction of the cutting head 200, the laser emitter 300 is arranged on one side of the slide 100, the other side of the slide 100 is provided with the laser receiver 310 matched with the laser emitter 300, the laser receiver 310 is in communication connection with the power system of the cutting head 200, and the mechanical stopper 400 is installed on the slide 100; the output end of the laser emitter 300 emits laser, and the laser receiver 310 can accept the laser emitted by the laser emitter 300, so as to form a laser interception channel on the path of the slide 100; with the movement of the cutting head 200, when the cutting head 200 moves to the laser channel and blocks the laser, the laser receiver 310 cannot accept the laser, so as to emit an electric signal to the power system of the cutting head 200 to control the power system of the cutting head 200 to be closed, so as to eliminate the possibility of further expansion of the acceleration of the cutting head 200; it should be noted that the power system of the cutting head 200 is the prior art known by those skilled in the art, and the present application does not make too many limitations, and is also not limited to the present application; it should be noted that the laying distance between the laser emitter 300 and the mechanical stopper 400 along the path of the slide 100 is L1, and the distance between the two ends of the cutting head 200 along the path direction of the slide 100 is L2, L2>L1; this is because when the cutting head 200 is at rest, it can continuously block the laser to achieve stable stop.

[0036] Figure 2 A structure schematic diagram of the mechanical stopper 400 is shown; Figure 2In the mechanical stopper 400, a piston outer cavity 410 is arranged therein, a piston head 420 is arranged in the piston outer cavity 410, the piston head 420 comprises two spaced apart partitions 421, the two partitions 421 cooperate with the piston outer cavity 410 to form a piston inner cavity 422, the piston inner cavity 422 contains damping liquid, a connecting rod 423 is connected between the two partitions 421, a piston rod 450 is inserted into the piston inner cavity 422, a piston sheet 424 is connected to the insertion end of the piston rod 450, a through hole 425 is arranged on the piston sheet 424, the connecting rod 423 penetrates through the through hole 425, and a medium passage for medium circulation is formed between the through hole 425 and the connecting rod 423; in actual use, the free end of the piston rod 450 extends to the path of the slide 100, carries and conducts the force of the slide 100 to the piston inner cavity 422, drives the piston sheet 424 to do the stroke in the piston inner cavity 422, makes the damping liquid pass through the medium passage and absorb kinetic energy, and reduces the impact force when the cutting head 200 contacts with the mechanical stopper 400.

[0037] Figure 3 A structural schematic diagram of the piston head 420 is shown; Figure 4 A structural schematic diagram of the transition section one 510 is shown; Figure 5 A structural schematic diagram of the transition section two 520 is shown; Figure 6 A structural schematic diagram of the transition section three 530 is shown; Figures 3-6In the middle, the connecting rod 423 is sequentially provided with a transition section one 510, a transition section two 520 and a transition section three 530 along the movement direction of the piston sheet 424, the piston sheet 424 is driven by the cutting head 200 to sequentially pass through the transition section one 510, the transition section two 520 and the transition section three 530 to adjust the throttling area of the medium passage; the transition section one 510 has a plurality of ring pieces 511 arranged at equal distances, and there is a gap between the outer edge of the ring piece 511 and the inner wall of the perforation 425; that is, when the piston sheet 424 passes through the transition section one 510, the perforation 425 will alternately pass through the connecting rod 423 and the ring piece 511, since the ring piece 511 is formed by the radial extension of the connecting rod 423 and only has a gap when it coincides with the perforation 425, the throttling area can be greatly reduced, and the acceleration of the cutting head 200 can be reduced, and the setting of a plurality of ring pieces 511 can simulate the realization of the rhythmic point brake of the cutting head 200, which can not only avoid the rigid collision between the piston rod 450 and the cutting head 200, but also quickly reduce the acceleration of the cutting head 200; the transition section two 520 has a plunger 521 extending radially, and there is a gap between the plunger 521 and the perforation 425, a plurality of groups of plungers 521 are laid along the travel path of the piston sheet 424, and the axial length of the plunger 521 increases along the travel direction of the piston sheet 424, and the distance between adjacent two plungers 521 decreases, the piston head 420 is slidably arranged in the piston outer cavity 410 and divides the piston outer cavity 410 into two non-communicating energy absorption cavities 430 and 440, and the energy absorption cavities two 440 and one 430 have energy absorption medium; in actual use, since there is only a gap between the perforation 425 and the plunger 521, that is, when the perforation 425 passes through the plunger 521, the throttling area of the medium passage becomes very small, only allowing the damping liquid to pass slowly, and at this time the piston sheet 424 drives the piston head 420 to move downward as a whole, at this time the volume of the energy absorption cavity one 430 expands and the volume of the energy absorption cavity two 440 decreases, thereby forcing the energy absorption medium in the energy absorption cavities two 440 and one 430 to change state, that is, at this time, the energy absorption medium in the energy absorption cavities two 440 and one 430 absorbs the energy of the cutting head 200, and when the perforation 425 passes through the connecting rod 423 section between adjacent two plungers 521, the piston head 420 is driven by the medium in the energy absorption cavities two 440 and one 430 to quickly reset, and the connecting rod 423 and the piston sheet 424 move relatively, and the damping liquid is used to absorb the kinetic energy of the cutting head 200, with the alternation of the plunger 521 and the connecting rod 423, the damping liquid and the energy absorption medium in the energy absorption cavities two 440 and one 430 alternately absorb the energy of the cutting head 200, because the transition section two 520 is a deceleration process of the cutting head 200, in this process, the incompressibility of the damping liquid and the compressibility of the medium in the energy absorption cavities two 440 and one 430 can not only realize the rapid reduction of the speed of the cutting head 200, but also avoid the occurrence of rigid collision;Meanwhile, the ratio of the plunger 521 is getting larger and larger, indicating that as the cutting head 200 speed decreases, the compressible medium can quickly respond at low speed of the cutting head 200, providing immediate energy absorption effect; the end face of the piston rod 450 is provided with a spacer 460, which can indirectly contact the cutting head 200 and the piston rod 450, and also avoid the rebound of the cutting head 200.

[0038] It should be noted that the energy absorption medium in the energy absorption cavity one 430 and the energy absorption cavity two 440 can be gas; for example, the energy absorption medium in the energy absorption cavity one 430 and the energy absorption cavity two 440 is nitrogen, that is, the setting of the transition section two 520 can make the damping liquid and the gas alternately absorb the kinetic energy of the cutting head 200;

[0039] Alternatively, the energy absorption medium in the energy absorption cavity one 430 and the energy absorption cavity two 440 is solid; for example, the energy absorption medium in the energy absorption cavity one 430 and the energy absorption cavity two 440 is an elastic element, a spring or an elastic material, etc., so that the setting of the transition section two 520 can make the damping liquid and the elastic element alternately absorb the kinetic energy of the cutting head 200.

[0040] Alternatively, the energy absorption medium in the energy absorption cavity two 440 and the energy absorption cavity one 430 is a combination of gas and solid; for example, the energy absorption cavity one 430 and the energy absorption cavity two 440 are filled with nitrogen and provided with an elastic element, so that the setting of the transition section two 520 can make the damping liquid and nitrogen and the elastic element alternately absorb energy.

[0041] Alternatively, the energy absorption medium in the energy absorption cavity one 430 is gas, and the energy absorption medium in the energy absorption cavity two 440 is solid; or vice versa.

[0042] Continuing to refer to Figure 6 The transition section three 530 has a stop head 531, which is tapered; in this way, as the perforation 425 passes through the stop head 531, the throttling area of the medium passage gradually decreases until it disappears completely, and the perforation 425 is blocked, at which time the cutting head 200 stops and adheres to the surface of the mechanical stop block 400.

[0043] The limiting method of the safety limiting mechanism of the laser pipe cutting machine is as follows:

[0044] S1, cut off the power source;

[0045] Start the laser receiver 310, and the output end of the laser emitter 300 emits laser to the laser receiver 310 and forms a laser interception channel on the path of the slide 100. When the cutting head 200 moves to the laser channel and blocks the laser, the laser receiver 310 emits an electrical signal to the power system of the cutting head 200 and controls the power system of the cutting head 200 to shut down;

[0046] S2, point brake;

[0047] Cutting head 200 contacts piston rod 450 and drives piston sheet 424 through transition section one 510 on connecting rod 423, when piston sheet 424 passes through transition section one 510, perforation 425 will alternately pass through connecting rod 423 and ring sheet 511, using the reduced throttling area when ring sheet 511 meets perforation 425 to achieve rhythmic point braking;

[0048] S3, alternate energy absorption;

[0049] Drive piston sheet 424 through transition section two 520 on connecting rod 423, when piston sheet 424 passes through transition section one 510, perforation 425 will alternately pass through connecting rod 423 and plunger 521, when perforation 425 passes through connecting rod 423, the damping liquid in piston cavity 422 absorbs energy through the medium passage between connecting rod 423 and perforation 425, when perforation 425 passes through plunger 521, it can drive the whole piston head 420 to move downward and force the energy absorption medium in energy absorption cavity two 440 and energy absorption cavity one 430 to change phase to achieve energy absorption.

[0050] S4, stop;

[0051] Drive piston sheet 424 through transition section three 530 on connecting rod 423, when perforation 425 passes through stop head 531, as perforation 425 continues to move, the throttling area of the medium passage between perforation 425 and stop head 531 gradually decreases until cutting head 200 stops.

[0052] The above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto.

Claims

1. A safety limiting mechanism for a laser tube cutting machine, used to limit the sliding of a cutting head (200) on a slide rail (100), characterized in that, The device includes a mechanical stop (400) positioned along the travel path of the cutting head (200). The mechanical stop (400) has a piston cavity (422) within it. A piston rod (450) is inserted into the piston cavity (422), and a piston plate (424) is connected to the insertion end of the piston rod (450). A through hole (425) is formed in the piston plate (424). A connecting element is provided within the piston cavity (422) along the travel trajectory of the piston plate (424). The connecting rod (423) is provided with transition section one (510), transition section two (520) and transition section three (530) in sequence along the traveling direction of piston plate (424). The piston plate (424) is driven by the cutting head (200) to slide in the piston cavity (422) and make the perforation (425) pass through transition section one (510), transition section two (520) and transition section three (530) in sequence to adjust the throttling area of ​​the medium channel; A plurality of ring pieces (511) are evenly distributed on the transition section (510) of the connecting rod (423); when the ring pieces (511) meet the through hole (425), there is a gap between them; The connecting rod (423) has a radially extending plunger (521) on the transition section two (520). When the plunger (521) meets the perforation (425), there is a gap between them. The plunger (521) is laid in several sets along the travel path of the piston plate (424). The mechanical stop (400) has a piston outer cavity (410). A piston head (420) is slidably arranged in the piston outer cavity (410) and divides the piston outer cavity (410) into two non-communicating energy absorption chambers, namely, energy absorption chamber one (430) and energy absorption chamber two (440). The piston head (420) includes two spaced partitions (421). The two partitions (421) cooperate with the piston outer cavity (410) to form a piston inner cavity (422). A connecting rod (423) connects the two piston inner cavities (422). Both the energy absorption chamber two (440) and the energy absorption chamber one (430) contain energy absorption media.

2. The safety limit mechanism for a laser tube cutting machine according to claim 1, characterized in that, Along the travel direction of the piston plate (424), the axial length of the plunger (521) increases, and the distance between two adjacent plungers (521) decreases.

3. The safety limit mechanism for a laser tube cutting machine according to claim 2, characterized in that, The energy-absorbing medium in the first energy-absorbing cavity (430) and the second energy-absorbing cavity (440) is one of gas, solid, or a combination of both.

4. The safety limit mechanism for a laser tube cutting machine according to claim 3, characterized in that, The transition section three (530) has a stop (531), which is tapered.

5. The safety limiting mechanism for a laser tube cutting machine according to claim 4, characterized in that, It also includes a laser emitter (300), and along the travel direction of the cutting head (200), the laser emitter (300) and the mechanical stop (400) are arranged in sequence. The laser emitter (300) is arranged on one side of the slide (100), and a laser receiver (310) that cooperates with the laser emitter (300) is arranged on the other side of the slide (100). The laser receiver (310) is communicatively connected to the power system of the cutting head (200), and the mechanical stop (400) is mounted on the slide (100).

6. The safety limit mechanism for a laser tube cutting machine according to claim 5, characterized in that, The mechanical stop (400) has a spacer (460) on its end face facing the cutting head (200).

7. The limiting method of the safety limiting mechanism of the laser tube cutting machine according to any one of claims 1-6, characterized in that, The specific steps are as follows: S1, cut off the power source; When the laser receiver (310) is activated, the output end of the laser emitter (300) emits a laser to the laser receiver (310) and forms a laser interception channel on the path of the slide (100). When the cutting head (200) moves to the laser channel and blocks the laser, the laser receiver (310) sends an electrical signal to the power system of the cutting head (200) and controls the power system of the cutting head (200) to shut down. S2, intermittent braking; The cutting head (200) contacts the piston rod (450) and drives the piston plate (424) through the transition section (510) of the connecting rod (423). When the piston plate (424) passes through the transition section (510), the perforation (425) will alternately pass through the connecting rod (423) and the ring plate (511). When the ring plate (511) meets the perforation (425), the throttling area decreases to achieve rhythmic braking. S3, alternate energy absorption; The piston plate (424) is driven through the transition section two (520) on the connecting rod (423). When the piston plate (424) passes through the transition section one (510), the perforation (425) alternately passes through the connecting rod (423) and the plunger (521). When the perforation (425) passes through the connecting rod (423), the damping fluid in the piston cavity (422) absorbs energy through the medium channel between the connecting rod (423) and the perforation (425). When the perforation (425) passes through the plunger (521), it can drive the piston head (420) to move down as a whole and force the energy absorption medium in the energy absorption chamber two (440) and the energy absorption chamber one (430) to undergo a change in state to absorb energy. S4, Stagnation; The drive piston plate (424) passes through the transition section three (530) on the connecting rod (423). When the perforation (425) passes through the stop (531), as the perforation (425) continues to move, the throttling area of ​​the medium channel between the perforation (425) and the stop (531) gradually decreases until the cutting head (200) stops.

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