A safety device for preventing free falling of a clamping body during milling of a steel pipe end

Abstract

The present application relates to a kind of safety devices for preventing the free falling of steel pipe end milling machine milling clamping body, the device is newly provided with anti-falling mechanism on steel pipe end milling machine, the mechanism is composed of piston type air cylinder β, push-pull plate, connecting seat and support bar and other components, three-way two-position direct-acting electromagnetic valve is used to adjust high-pressure air to control the extension and retraction of piston rod β, piston rod β drives two support bars to slide in guide bushing by connecting seat and push-pull plate, after the completion of steel pipe end face milling operation, drive support bar to extend outward into the inner circle of upper semicircle clamping body, stably hold upper semicircle clamping body to prevent it from falling, safe and reliable;Thus effectively avoid the phenomenon of upper semicircle clamping body falling due to accidental failure or personnel misoperation, ensure the safety of worker maintenance operation.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment for milling steel pipe end faces, and in particular to a safety device to prevent the milling clamp of a steel pipe end milling machine from falling freely. Background Technology

[0002] Steel pipes are manufactured through a series of processes, including roll forming of steel strips of a certain width and thickness, high-frequency welding, scraping, air cooling, water cooling, sizing, sawing, straightening, milling, inspection, and final product processing. Milling the end face of the sawed steel pipe is a crucial step in ensuring its quality. This milling is performed using a clamping device on a milling machine. The clamping device holds the pipe in place with two semi-circular clamping bodies, and grooves on the inner surface of the clamping bodies ensure effective clamping.

[0003] After the outer surface of the steel pipe end is clamped, the disc milling head of the milling machine begins to slowly advance towards the end of the steel pipe to mill away the uneven surface and some residual iron filings left after sawing the end of the steel pipe, so as to achieve the technical standard of flatness and smoothness required for the end of the steel pipe.

[0004] After a period of use, the alloy steel cutting heads used in the pipe end milling machine become dull and require replacement. This necessitates lifting the upper semi-circular clamping body of the pipe clamping device. This upper semi-circular clamping body, weighing approximately 20 kg, is made of steel. Lifting is achieved by the movement of the piston rod of the upper cylinder of the pipe end milling machine. Once the upper semi-circular clamping body is lifted, the maintenance worker can replace the cutting tools at this position.

[0005] Sometimes, due to sudden power outages in the workshop, the air compressor stops supplying air, causing the piston cylinder on the steel pipe end milling machine to lose its high-pressure air supply. Alternatively, improper operation by employees can lead to malfunctions in electric or pneumatic components, causing the steel pipe milling clamp to fall. A malfunction in the piston cylinder's air supply line can also cause the piston cylinder to malfunction, resulting in the upper half of the clamp falling suddenly without warning and striking the shoulder or back of a maintenance worker changing milling tools, causing a workplace injury. Such workplace injuries caused by the sudden fall of the upper part of the steel pipe milling clamp are frequent occurrences in steel pipe manufacturing enterprises. To completely eliminate this safety hazard, developing a device to prevent the free fall of the upper clamp on the steel pipe end milling machine is an urgent problem that the steel pipe manufacturing industry needs to solve to ensure the safety of maintenance work. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a safety device to prevent the clamping body of a steel pipe end milling machine from falling freely during milling.

[0007] The technical solution of this invention is: a safety device for preventing the free fall of the milling clamp of a steel pipe end milling machine, comprising a steel pipe end milling machine and an anti-fall mechanism installed on the upper part of the steel pipe end milling machine, characterized in that:

[0008] A middle plate is provided between the two side plates of the steel pipe end milling machine. A milling cutter head is provided in the middle of the outer side of the middle plate. A platform plate is provided between the outer sides of the upper part of the two side plates. The platform plate is located above the worktable of the lower milling machine. A lower semi-circular clamping body with an opening facing upward is fixedly connected to the worktable. A piston cylinder A is vertically fixedly connected to the upper end face of the platform plate. The piston rod A of the piston cylinder A extends downward from the circular hole on the platform plate. The lower end of the piston rod A is fixedly connected to an upper semi-circular clamping body with an opening facing downward through a seat plate. The upper and lower semi-circular clamping bodies are directly opposite each other.

[0009] The fall arrest mechanism includes a piston cylinder B and a support rod. The upper part of the middle plate has a through hole, in which a guide sleeve is coaxially fixed. The support rod is slidably fitted in the guide sleeve, and the outer end of the support rod can extend directly below the upper semi-circular clamping body. The inner end of the support rod has a connecting seat. A support plate is fixedly connected between the inner sides of the upper ends of the two side plates. The piston cylinder B is laterally fixedly connected to the outer side of the support plate. The piston rod B of the piston cylinder B and the connecting seat are hinged.

[0010] Preferably, the milling cutter heads are arranged in two rows side by side, the lower semicircular clamping bodies are arranged in two corresponding rows, and the piston-type cylinders and the upper semicircular clamping bodies are arranged in two corresponding rows.

[0011] Preferably, two support rods are arranged side by side, and a push-pull plate is connected between the inner ends of the two support rods. The push-pull plate and the support rods are fixedly connected by a set nut, and the connecting seat is located in the middle of the push-pull plate.

[0012] Preferably, the outer side of the workbench is provided with a conveyor platform, which is provided with a sliding bracket for supporting the steel pipe. The sliding bracket is provided with a V-shaped groove corresponding to the position of the lower semi-circular clamping body.

[0013] Preferably, the platform plate has a guide hole on its outer side, and the seat plate has a guide rod extending upward through the guide hole on its outer side.

[0014] Preferably, a marker rod of the same length as the guide rod is vertically fixedly connected to the outer side of the guide rod, and a proximity switch is provided on the inner side of the upper end of the marker rod.

[0015] Preferably, a direct-acting solenoid valve is connected to the piston cylinder B. The solenoid valve has a junction box on one side of its valve body, a stationary iron core at the upper end of the valve body, an air passage A in the middle of the stationary iron core that communicates with the inner cavity of the valve body, an air passage B and an air passage C at the lower end of the valve body, the air passage B communicating with the inner cavity of the valve body, and a valve core that can seal the air passage C connected to the inner end of the air passage C by a spring. A coil sleeved around the valve core is provided at the upper part of the inner cavity of the valve body.

[0016] Preferably, the lower end of the valve core is provided with a sealing plug to seal the air passage C.

[0017] The beneficial technical effects of this invention are:

[0018] First, the present invention newly incorporates a fall prevention mechanism on the steel pipe end milling machine.

[0019] Composed of components such as piston cylinder B, push-pull plate, connecting seat, and support rods, it uses a three-way two-position direct-acting solenoid valve to regulate high-pressure air to control the extension and retraction of piston rod B. Piston rod B drives two support rods to slide within the guide bushing via the connecting seat and push-pull plate. After the steel pipe end face milling operation is completed, the drive support rods extend outward into the inner circle of the upper semi-circular clamping body, steadily supporting the upper semi-circular clamping body to prevent it from falling, ensuring safety and reliability. Therefore, it effectively avoids the phenomenon of the upper semi-circular clamping body falling due to accidental failure or human error, ensuring the safety of workers during maintenance operations.

[0020] Secondly, this invention employs the function of an intelligent facial recognition system. By pre-identifying and storing facial feature signals through the facial recognition system and controlling the independent power supply, not only is system security increased, but it also facilitates power control for maintenance workers. When the equipment is being repaired, as long as the maintenance worker is identified, once the facial recognition system is successful, the independent power supply controls the junction box of the three-way two-position direct-acting solenoid valve. After the solenoid valve operates according to its function, it connects high-pressure gas to the cylinder piston to start working.

[0021] The operation of the equipment being repaired is controlled by the maintenance worker, which avoids the previous situation where others unknowingly operated the machine while the maintenance worker was performing maintenance, causing the upper semi-circular clamp of the milling machine to fall and resulting in accidental work-related injuries to the worker who was performing maintenance. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 This is a side view of the structure of the present invention;

[0024] Figure 3 This is a top view of the structure of the present invention;

[0025] Figure 4 yes Figure 3 Sectional view along axis AA;

[0026] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0027] Figure 6 yes Figure 4 BB-direction sectional view;

[0028] Figure 7 This is a front view structural schematic diagram of the steel pipe end milling machine of the present invention;

[0029] Figure 8 This is a schematic diagram of the fall protection mechanism of the present invention;

[0030] Figure 9 This is a schematic diagram of the internal structure of the solenoid valve of the present invention;

[0031] Figure 10 This is the control circuit diagram for the face recognition of the present invention.

[0032] In the diagram, 01. Steel pipe end milling machine, 11. Side plate, 12. Middle plate, 13. Platform plate, 14. Worktable, 15. Milling cutter head, 16. Piston cylinder A, 161. Piston rod A, 162. Seat plate, 163. Air inlet A, 164. Air inlet B, 17. Upper semi-circular clamping body, 18. Lower semi-circular clamping body, 19. Guide rod, 191. Sliding sleeve, 20. Marker, 201. Proximity switch, 02. Sliding bracket, 21. 03. V-shaped groove, 04. Steel pipe, 05. Fall protection mechanism, 46. Piston cylinder B, 47. Piston rod B, 48. Air inlet C, 49. Air inlet D, 40. Support rod, 41. Guide bushing, 42. Support plate, 43. Long bolt, 44. Push-pull plate, 45. Connecting seat, 46. Set nut, 57. Solenoid valve, 58. Valve body, 59. Valve body cavity, 50. Valve core, 51. Sealing plug, 52. Coil, 53. Spring, 54. Static iron core, 55. Air passage A, 56. Air passage B, 57. Air passage C, 58. Junction box, 59. Intermediate relay, 50. Face recognition device. Detailed Implementation

[0033] Example 1, see appendix to the instruction manual. Figure 1- 10. The following describes in detail, with reference to the accompanying drawings, a safety device for preventing the free fall of a milling clamping body of a steel pipe end milling machine provided by the present invention. The device includes a steel pipe end milling machine and a fall arrestor installed on the upper part of the steel pipe end milling machine. A middle plate is provided between the two side plates of the steel pipe end milling machine. A milling cutter disc for milling the end face of a steel rod is provided on the lower part of the outer side of the middle plate. A platform plate is provided between the outer sides of the upper ends of the two side plates. The platform plate is located above the worktable of the lower milling machine. A lower semi-circular clamping body, corresponding to the position of the milling cutter disc and with its opening facing upward, is fixedly connected to the worktable. The center of the lower semi-circular clamping body corresponds to the center of the milling cutter disc. The platform plate... A piston-type cylinder A is vertically fixed to the upper end face. The piston rod A of the piston-type cylinder A extends downward from the circular hole on the platform plate. The lower end of the piston rod A is fixedly connected to an upper semi-circular clamping body with an opening facing downward through a seat plate. The upper and lower semi-circular clamping bodies are directly opposite each other. The end of the steel pipe is clamped between the upper and lower semi-circular clamping bodies. The end face of the steel pipe is milled by a milling cutter to remove the uneven surface left after sawing the end of the steel pipe and some residual iron filings. A conveyor table is provided on the outside of the workbench. The conveyor table is provided with a sliding bracket for supporting the steel pipe. The sliding bracket is provided with a V-shaped groove corresponding to the position of the lower semi-circular clamping body.

[0034] The milling process of this steel pipe end milling machine is as follows: The steel pipe enters the lower circular clamping body through the V-shaped groove of the sliding bracket. Under the PLC program instruction of the milling machine, high-pressure gas is introduced into the air inlet A at the upper end of the piston cylinder A. The piston rod A moves downward, pushing the upper circular clamping body downward until the steel pipe is clamped between the upper and lower circular clamping bodies. Then, the milling cutter on the milling machine begins to mill the end face of the steel pipe. After milling is completed, the piston cylinder A, through the PLC program instruction of the milling machine, introduces high-pressure air into the air inlet B of the piston cylinder A. The piston rod B drives the upper circular clamping body upward, releasing the clamping force on the steel pipe. After the steel pipe leaves the V-shaped groove and the lower clamping body of the end milling machine, one milling operation on the end of the steel pipe is completed.

[0035] The fall arrest mechanism includes a piston cylinder B and a support rod. The upper part of the middle plate has a through hole, in which a guide sleeve is coaxially fixed. The support rod is slidably fitted into the guide sleeve, and the outer end of the support rod can extend directly below the upper semi-circular clamping body. The guide sleeve provides sliding support for the support rod, making its extension and retraction operation more stable. The inner end of the support rod has a connecting seat. The inner sides of the upper ends of the two side plates are fixedly connected to the support plate by welding. The piston cylinder B is horizontally fixed to the outer side of the support plate. The piston cylinder B is fixedly connected to the support plate by a set of long bolts. The piston rod B of the piston cylinder B and the connecting seat are hinged.

[0036] The working process of this fall protection mechanism is as follows:

[0037] After the steel pipe is processed and the upper semi-circular clamping body rises, high-pressure air (0.5MPa) is introduced into the air inlet C of the piston cylinder B. The piston rod B pushes the support rod outward through the connecting seat. The support rod slides outward from the guide sleeve to directly below the upper semi-circular clamping body, dragging the upper semi-circular clamping body to prevent the upper semi-circular clamping body from falling due to the factors mentioned in the background art, thus ensuring the safety of maintenance work. High-pressure gas is introduced into the air inlet D, which drives the support rod to slide inward through the piston rod B, releasing the semi-circular clamping body. The semi-circular clamping body can then move downward normally to clamp the steel pipe for milling operations.

[0038] The milling cutter head is arranged in two rows, and the lower semi-circular clamping body is arranged in two corresponding positions. The piston cylinder and the upper semi-circular clamping body are arranged in two corresponding positions. The support rod is arranged in two rows, and a push-pull plate is connected between the inner ends of the two support rods. The push-pull plate and the support rod are fixedly connected by a set nut. The connecting seat is located in the middle of the push-pull plate, and the two support rods are synchronously driven to extend and retract through the push-pull plate.

[0039] The platform plate has a guide hole on its outer side, and the seat plate has a guide rod extending upward through the guide hole on its outer side. The guide rod guides the piston rod A to slide, preventing rotation during the extension and retraction of the piston rod A, and ensuring the stability of the upper circular clamping body. A sliding sleeve is fixedly fitted inside the guide hole to maintain the stability of the guide rod sliding up and down.

[0040] A marker rod of the same length as the guide rod is vertically fixed to the outside of the guide rod. A proximity switch is provided on the inner side of the upper end of the marker rod. When the guide rod and the upper circular clamping body rise to the upper end simultaneously, they will trigger the proximity switch at the upper end of the marker rod, close the piston cylinder, and stop the guide rod and the upper circular clamping body from moving. The rising height of the upper circular clamping body is controlled by the marker rod and the proximity switch.

[0041] The piston cylinder B is connected to a direct-acting solenoid valve. A junction box is provided on one side of the valve body. A stationary iron core is provided at the upper end of the valve body. An air passage A, which communicates with the inner cavity of the valve body, is provided in the middle of the stationary iron core. An air passage B and an air passage C are provided at the lower end of the valve body. Air passage B communicates with the inner cavity of the valve body. A valve core that can seal the air passage C is connected to the inner end of the air passage C by a spring. A coil that is sleeved on the valve core is provided at the upper part of the inner cavity of the valve body. A sealing plug is provided at the lower end of the valve core to seal the air passage C.

[0042] The process described above, where high-pressure air (0.5MPa) enters piston cylinder B through intake port C, is controlled by the aforementioned three-way two-position direct-acting solenoid valve. The working principle of this direct-acting solenoid valve is as follows: When the terminal of the junction box is energized, the coil is energized, and the stationary iron core generates electromagnetic force. The valve core moves upward under the action of electromagnetic force, lifting the sealing plug and connecting air passage C with air passage B. After disconnecting air passage B from air passage A, the solenoid valve is in the intake state and begins to drive piston cylinder B to move. When the power is off, the valve core returns to its original state by the action of the spring force, that is, air passage A and air passage B are disconnected, and air passage B and air passage A are connected, and the solenoid valve is in the exhaust state.

[0043] The power supply for the junction box of the direct-acting solenoid valve comes from the independent power supply of the face recognition device. The voltage at the power output interface is 12V and the current is 2A. Power is supplied to the 12V interface of the relay via a rubber-insulated copper core wire, and then connected from the 220V output interface of the intermediate relay to the interface of the solenoid valve. After the solenoid valve is energized, it activates the fall protection mechanism, dragging the upper circular clamping body, completing the entire fall protection action procedure, thereby achieving the objective of this invention.

Claims

1. A safety device for preventing the free fall of the milling clamp of a steel pipe end milling machine, comprising a steel pipe end milling machine and a fall protection mechanism installed on the upper part of the steel pipe end milling machine, characterized in that: A middle plate is provided between the two side plates of the steel pipe end milling machine. A milling cutter head is provided in the middle of the outer side of the middle plate. A platform plate is provided between the outer sides of the upper part of the two side plates. The platform plate is located above the worktable of the lower milling machine. A lower semi-circular clamping body with an opening facing upward is fixedly connected to the worktable. A piston cylinder A is vertically fixedly connected to the upper end face of the platform plate. The piston rod A of the piston cylinder A extends downward from the circular hole on the platform plate. The lower end of the piston rod A is fixedly connected to an upper semi-circular clamping body with an opening facing downward through a seat plate. The upper and lower semi-circular clamping bodies are directly opposite each other. The fall arrest mechanism includes a piston cylinder B and a support rod. The upper part of the middle plate has a through hole, in which a guide sleeve is coaxially fixed. The support rod is slidably fitted in the guide sleeve, and the outer end of the support rod can extend directly below the upper semi-circular clamping body. The inner end of the support rod has a connecting seat. A support plate is fixedly connected between the inner sides of the upper ends of the two side plates. The piston cylinder B is laterally fixedly connected to the outer side of the support plate. The piston rod B of the piston cylinder B and the connecting seat are hinged.

2. The safety device for preventing the milling clamp of a steel pipe end milling machine from falling freely as described in claim 1, characterized in that: The milling cutter head is arranged in two rows, with two corresponding lower semi-circular clamping bodies, and two corresponding piston-type cylinders and two corresponding upper semi-circular clamping bodies.

3. The safety device for preventing the milling clamp of a steel pipe end milling machine from falling freely as described in claim 2, characterized in that: The support rods are arranged side by side, and a push-pull plate is connected between the inner ends of the two support rods. The push-pull plate and the support rods are fixedly connected by a set nut, and the connecting seat is located in the middle of the push-pull plate.

4. The safety device for preventing the milling clamp of a steel pipe end milling machine from falling freely as described in claim 1, characterized in that: The outer side of the workbench is provided with a conveyor platform, which is provided with a sliding bracket for supporting the steel pipe. The sliding bracket is provided with a V-shaped groove corresponding to the position of the lower semi-circular clamping body.

5. A safety device for preventing the milling clamp of a steel pipe end milling machine from falling freely as described in claim 1, characterized in that: The platform plate has a guide hole on its outer side, and the seat plate has a guide rod that extends upward through the guide hole on its outer side.

6. A safety device for preventing the free fall of the milling clamping body of a steel pipe end milling machine according to claim 5, characterized in that: A marker rod of the same length as the guide rod is vertically fixedly connected to the outer side of the guide rod, and a proximity switch is provided on the inner side of the upper end of the marker rod.

7. A safety device for preventing the free fall of the milling clamping body of a steel pipe end milling machine according to claim 1, characterized in that: The piston cylinder B is connected to a direct-acting solenoid valve. The valve body has a junction box on one side, a stationary iron core at the upper end of the valve body, an air passage A in the middle of the stationary iron core that communicates with the inner cavity of the valve body, an air passage B and an air passage C at the lower end of the valve body, the air passage B communicating with the inner cavity of the valve body, and a valve core that can seal the air passage C connected to the inner end of the air passage C by a spring. A coil is provided on the upper part of the inner cavity of the valve body and sleeved on the valve core.

8. A safety device for preventing the free fall of the milling clamping body of a steel pipe end milling machine according to claim 7, characterized in that: The lower end of the valve core is provided with a sealing plug, which is used to seal the air passage C.

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