Hydraulic cantilever clamping type steel pipe outer circle polishing device

Abstract

The utility model discloses a hydraulic cantilever clamping type steel pipe outer circle polishing device which comprises a bearing table, a dust cover located at one end of the bearing table and a polishing assembly in the dust cover, and is characterized in that a plurality of pairs of supporting wheels are arranged on the bearing table in the length direction of a steel pipe and comprise the left supporting wheel and the right supporting wheel, the supporting wheel on one side is a driving wheel, and the supporting wheel on the other side is a driven wheel. The supporting wheel on the other side is a follower wheel, and an acute angle is formed between a wheel shaft of the follower wheel and the center line of the steel pipe. The polishing assembly comprises a hydraulic cylinder located above the center line of the steel pipe, the hydraulic cylinder is connected with two pairs of rotating arms symmetrically arranged above the two sides of the steel pipe through connecting rod assemblies, the upper ends of the rotating arms are hinged to the supporting frame in the dustproof cover, and grinding wheels are arranged at the lower ends of the rotating arms. The polishing device overcomes the phenomenon of piece explosion caused by self-vibration, bounce displacement and the like of the grinding machine in the finishing process, can finely adjust to the optimal polishing force in a mode of hydraulically clamping the two sides of the double-rotating-arm steel pipe and synchronously applying pressure, and is simple to operate, safe, environment-friendly and stable in operation.

Description

Technical Field

[0001] The utility model relates to a pipe surface processing equipment technology, in particular to a hydraulic cantilever clamping type steel pipe outer circle polishing device. Background Art

[0002] There are various designs of tube surface grinding and polishing devices available in the public art. For example, patent publication number CN105196146B describes a pneumatic steel tube external grinding and polishing machine comprising a fixed feed mechanism, a stator with a stepped inner bore, and a rotor support frame. A truncated cylindrical rotor rotatable about its own axis is eccentrically mounted within the stator, forming a cavity between the larger end of the rotor and the larger end of the stator. The smaller end of the rotor is connected to the rotor support frame. The larger end of the rotor is uniformly distributed with multiple blades and three polishing head mounting holes that communicate with the rotor inner bore, allowing the blades to reciprocate radially along the rotor diameter. The sidewalls of the stator are provided with air inlets and exhaust ports that communicate with the cavity. A reciprocating polishing head is located within the polishing head mounting hole. This polishing machine is capable of removing rust and scale from expansion joints and welds between U-shaped heat exchange tubes and tube sheets, as well as from spliced joints of other curved circular tubular workpieces.

[0003] Another example is patent publication number CN115351691A, which describes a surface polishing device for stainless steel pipes. A loading box for stacking multiple steel pipes is located on one side of a base. A discharge mechanism for releasing the steel pipes is located at the bottom outlet of the loading box. A loading mechanism, in contact with the discharge mechanism, is located on the base. The loading mechanism transports the steel pipes to the other side of the base and clamps them. A first polishing mechanism and a second polishing mechanism are located on the other side of the base. This device uses the loading mechanism to transport the steel pipes to the other side of the base and clamp them. The first polishing mechanism polishes the inner circumference of the clamped steel pipes, while the second polishing mechanism polishes the outer circumference of the clamped steel pipes. The polished steel pipes are then collected through a discharge plate.

[0004] For large-caliber stainless steel cast pipes, due to the large diameter, if the ends are to be clamped and rotated, a large clamping and rotating mechanism is required. In addition, due to the lack of surface accuracy at the ends of the cast pipes, not only is clamping and adjustment difficult, but also during grinding and polishing, the open length section away from the clamping end has poor stability, and jitter and offset can prevent the polishing operation from proceeding smoothly. Summary of the Invention

[0005] The purpose of this utility model is to solve the above problems and provide a hydraulic cantilever clamping type steel pipe outer circle polishing device, which has an open tube body propulsion and rotation mode, a cantilever hydraulically controlled side pressure rotating arm to assist in pressure application, and operates on both sides simultaneously. The polishing force can be adjusted as needed, and no special clamping and tightening of the end is required. It is simple to operate and safe and reliable.

[0006] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a hydraulic cantilever clamping type steel pipe outer cylindrical polishing device, comprising a supporting platform for supporting the steel pipe to be processed, a dust cover located at one end of the supporting platform and a polishing assembly in the dust cover, which is characterized in that several pairs of supporting wheels are provided on the supporting platform along the length direction of the steel pipe, including a left supporting wheel and a right supporting wheel, wherein the supporting wheel on one side is a driving wheel and the supporting wheel on the other side is a follower wheel, and the wheel axle of the follower wheel forms an acute angle with the center line of the steel pipe.

[0007] The polishing assembly includes a hydraulic cylinder located above the center line of the steel pipe. The hydraulic cylinder is connected to two pairs of rotating arms symmetrically arranged above the two sides of the steel pipe through a connecting rod assembly. The upper end of the rotating arm is hinged on the support frame inside the dust cover, and the lower end of the rotating arm is provided with a grinding wheel.

[0008] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, the connecting rod assembly includes a rod seat connected to the hydraulic cylinder piston rod, and the lower end of the rod seat is hinged to two connecting rods, and the two connecting rods are respectively connected to two pairs of rotating arms.

[0009] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, the rotating arm includes an arm plate, the arm plate is provided with a through hole, one end of the connecting rod passes through the through hole, and an adjusting nut is provided at the portion passing through the through hole.

[0010] In the aforementioned hydraulic cantilever clamping type steel pipe outer cylindrical polishing device, preferably, the rotating arm is equipped with a shoulder bearing at the position where the through hole is provided, and the shoulder bearing includes a pair of bearing seats, and a through rod hole seat is connected between the pair of bearing seats, and the hole of the through rod hole seat is clearance-matched with the connecting rod, that is, the connecting rod and the shoulder bearing form a hinged relationship.

[0011] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, springs are provided on both sides of the rod-penetrating hole seat on the connecting rod, and the springs are positioned by adjusting nuts.

[0012] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, the top of the rotating arm is provided with a hinge seat connected to the support frame inside the dust cover, and a grinding wheel is provided on the other side of the rotating arm opposite to the position where the steel pipe is located, and the grinding wheel drives the grinding wheel located at the lower end of the rotating arm.

[0013] In the aforementioned hydraulic cantilever clamping type steel pipe outer cylindrical polishing device, preferably, the driving wheels in the several pairs of supporting wheels are connected in series on the same driving shaft, and the driving shaft is connected to the main driving device.

[0014] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, bearing seats are respectively provided on both sides of the supporting wheel.

[0015] In the aforementioned hydraulic cantilever clamping type steel pipe outer circle polishing device, preferably, the acute angle formed by the wheel axle of the follower wheel and the center line of the steel pipe is 1 to 10 degrees.

[0016] This technical solution is designed mainly from the following aspects:

[0017] One is the self-rotation of the steel pipe being processed: the steel pipe is supported by multiple pairs of supporting wheels arranged on the supporting platform along the length direction of the steel pipe. The steel pipe is automatically centered under the action of its own weight. One row of supporting wheels is connected in series by a transmission shaft as a driving wheel, and the other row of supporting wheels is a follower wheel. The left and right supporting wheels jointly rub the surface of the steel pipe to form the self-rotational power of the steel pipe.

[0018] The second is the advancement of the steel pipe being processed: that is, relative to the feed of the grinding wheel, the grinding wheel machine used for polishing in this device is located in the dust cover (house) at one end of the supporting platform, and is stationary relative to the movement of the steel pipe. The steel pipe is driven by the left and right supporting wheels that support the steel pipe, wherein the axle of the follower wheel forms an acute angle with the center line of the steel pipe, so that all the follower wheels generate an axial thrust to the steel pipe during the rotation process, thereby causing the steel pipe to move forward while being polished. The angle formed by the axle of the follower wheel and the center line of the steel pipe is adjustable within the range of 1 to 10 degrees, and the advancement speed can be obtained according to the actual surface conditions of the steel pipe.

[0019] The third step is polishing the steel pipe surface. This device's polishing is performed by a polishing assembly housed within a dustproof enclosure. In addition to the grinding wheel, the polishing assembly's switching between active and standby positions is driven by a hydraulic cylinder located above the centerline of the steel pipe. When the hydraulic cylinder descends, the two pivoting arms connected by the connecting rod assembly extend, placing the grinding wheel in standby or idle mode. When the hydraulic cylinder ascends, the connecting rod assembly retracts the pivoting arms, placing the grinding wheel in operation. While operating, the hydraulic cylinder's stroke can be fine-tuned to vary the clamping force of the two pivoting arms on the steel pipe, achieving optimal polishing force.

[0020] Furthermore, a through hole is provided on the arm plate of the rotating arm, one end of the connecting rod passes through the through hole, and is connected and positioned by an over-shoulder bearing, a spring and an adjusting nut, so that the connecting rod and the over-shoulder bearing form a hinged relationship, and the positioning length of the rotating arm and the connecting rod can be adjusted to meet the polishing needs of steel pipes of different specifications.

[0021] Compared with the existing technology, the beneficial effects of the utility model are: solving the problems of difficult end clamping, difficult coaxiality adjustment, poor polishing stability, etc. in the surface finishing and polishing operation of large-diameter stainless steel cast pipe blanks, overcoming the bursting phenomenon caused by the vibration, rebound and displacement of the grinding wheel machine itself during the finishing process, and the hydraulic clamping double-rotating arm synchronous pressure application method on both sides of the steel pipe can fine-tune to the optimal polishing force, simple operation, safe and environmentally friendly, and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present utility model.

[0023] Figure 2 It is a schematic diagram of the structure of an operating state of the utility model.

[0024] Figure 3 yes Figure 1 Schematic diagram of the top view structure.

[0025] Figure 4 yes Figure 3 Schematic diagram of the locally enlarged structure at point M in the middle.

[0026] Figure 5 It is a partially enlarged structural diagram of a rotating arm part of the utility model.

[0027] Figure 6 yes Figure 5 Schematic diagram of the structural relationship between the middle rotating arm and the connecting rod assembly.

[0028] Figure 7 yes Figure 6 Schematic diagram of the A-direction structure.

[0029] Figure 8 This is a hydraulic system diagram of the present utility model.

[0030] In the figure: 1-carrying platform, 2-dust cover, 3-hydraulic cylinder, 4-connecting rod assembly, 401-connecting rod, 402-spring, 5-rotating arm, 501-arm plate, 502-hinge seat, 503-grinding machine, 6-left supporting wheel, 7-right supporting wheel, 8-main drive device, 9-drive shaft, 10-bearing seat, 11-grinding wheel, 12-steel pipe. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0032] This embodiment is a hydraulic cantilever clamping type steel pipe outer circle polishing device, see Figures 1 to 3 , including a supporting platform 1 for supporting the steel pipe 12 to be processed, a dust cover 2 located at one end of the supporting platform 1 (which can be made into a dust removal room according to the scale) and a polishing component in the dust cover 2.

[0033] A 6-meter-long steel pipe 12 is processed. Eleven pairs of supporting wheels are arranged along the length of the steel pipe 12 on the carrier 1. The spacing between each pair of supporting wheels is 1 meter, including the supporting wheels arranged in the dust cover 2. The supporting wheels are divided into left supporting wheels 6 and right supporting wheels 7. The left supporting wheel 6 is the driving wheel, and the right supporting wheel 7 is the follower wheel. The wheel axle of the right supporting wheel 7 forms an acute angle with the center line of the steel pipe 12. The acute angle can be adjusted within the range of 1 to 10 degrees. Figure 4 shown.

[0034] All supporting wheels are provided with bearing seats 10 on both sides.

[0035] The left supporting wheel 6 of the 11 pairs of supporting wheels is connected in series to the same drive shaft 9, which is connected to the main drive device 8. The 11 right supporting wheels 7 correspond to the left supporting wheels 6 and are installed on independent short shafts. The paired left supporting wheels 6 and right supporting wheels 7 share a mounting base.

[0036] The polishing assembly includes a hydraulic cylinder 3 located above the center line of the steel pipe, and the hydraulic cylinder 3 is controlled by a hydraulic system, such as Figure 8 As shown, the hydraulic cylinder is connected to two pairs of rotating arms 5 symmetrically arranged above the two sides of the steel pipe 12 through a connecting rod assembly 4. The upper ends of the rotating arms 5 are hinged on the support frame set in the dust cover 2, and the lower ends of the rotating arms 5 are provided with a grinding wheel 11. Figures 5 to 7 As shown, the connecting rod assembly 4 includes a rod seat connected to the piston rod of the hydraulic cylinder 3, and two connecting rods 401 of equal length and identical structure are hinged at the lower end of the rod seat. The two connecting rods 401 are respectively connected to the two pairs of rotating arms 5.

[0037] The pivoting arm 5 includes an arm plate 501, which has a through-hole 505 formed in its surface. One end of the connecting rod 401 extends through the through-hole 505, and an adjusting nut is provided at the location where the connecting rod 401 passes through the through-hole 505. Specifically, the pivoting arm 5 is equipped with an over-shoulder bearing 504 at the location where the through-hole 505 is located. The over-shoulder bearing 504 comprises a pair of bearing seats, with a rod-through hole seat connected between the pair of bearing seats. The pair of bearing seats are fixed to the arm plate 501, with the rod-through hole seat located precisely at the location of the through-hole 505. The holes in the rod-through hole seat are loosely fitted with the connecting rod 401. Since the ends of the rod-through hole seat are respectively positioned in the pair of bearing seats, the connecting rod 401 and the over-shoulder bearing 504 form a hinged relationship.

[0038] Furthermore, springs 402 are provided on both sides of the rod hole seat on the connecting rod 401, and the springs are positioned by adjusting nuts. Therefore, when the rotating arm 5 and the grinding wheel 11 are in operation, the grinding wheel 11 has a certain elastic force when clamping the steel pipe 12.

[0039] In addition, a hinge seat 502 connected to the support frame inside the dust cover 2 is provided at the top of the rotating arm 5, and a grinding wheel machine 503 is installed on the other side of the rotating arm 5 opposite to the location of the steel pipe 12. The grinding wheel machine 503 drives the grinding wheel 11 located at the lower end of the rotating arm 5 through a synchronous belt.

[0040] Working principle and application:

[0041] The steel pipe 12 being processed is placed on a support body formed by the left and right support wheels 6 and 7. When the circular steel pipe 12 is in a completely free state, its center of gravity automatically aligns. When the left support wheel 6, acting as the driving wheel, is driven by the main drive device 8, it drives the steel pipe 12 through friction, causing it to rotate, i.e., spin, and the right support wheel 7 to follow. During the rotation of the steel pipe 12, because the axle of the right support wheel 7 forms an angle with the centerline of the steel pipe 12, all the right support wheels 7 generate an axial thrust on the steel pipe 12. This thrust causes the steel pipe 12 to move in the output direction, i.e., toward the dust cover 2, thereby achieving a combined rotation and axial movement of the steel pipe 12.

[0042] When the polished surface of the steel pipe 12 is located below the polishing assembly, the piston of the hydraulic cylinder 3 moves upward, and the connecting rod 401 of the connecting rod assembly 4 retracts the two pairs of rotating arms 5. The polishing operation begins when the grinding wheel contacts the steel pipe 12. According to the current status of the steel pipe 12 and the polishing conditions, the piston of the hydraulic cylinder 3 can be fine-tuned to obtain the optimal polishing force of the grinding wheel 11.

[0043] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any structure that is simply modified by a person skilled in the art without departing from the principles of the present technical solution and without creative work shall fall within the scope of protection of the present invention.

Claims

1. A hydraulic cantilever clamping type steel pipe outer circle polishing device, comprising a bearing platform (1) supporting a steel pipe (12) to be processed, a dust cover (2) located at one end of the bearing platform and a polishing assembly in the dust cover, wherein the polishing assembly is The supporting platform is provided with a plurality of pairs of supporting wheels along the length direction of the steel pipe, including a left supporting wheel (6) and a right supporting wheel (7), wherein the supporting wheel on one side is a driving wheel and the supporting wheel on the other side is a follower wheel, and the wheel axle of the follower wheel forms an acute angle with the center line of the steel pipe; The polishing assembly comprises a hydraulic cylinder (3) located above the center line of the steel pipe, the hydraulic cylinder being connected to two pairs of rotating arms (5) symmetrically arranged above the two sides of the steel pipe via a connecting rod assembly (4), the upper ends of the rotating arms being hinged to a support frame inside the dust cover, and the lower ends of the rotating arms being provided with a grinding wheel (11).

2. The hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 1 is characterized in that: The connecting rod assembly (4) comprises a rod seat connected to the piston rod of the hydraulic cylinder (3), and two connecting rods (401) are hinged at the lower end of the rod seat, and the two connecting rods are respectively connected to two pairs of rotating arms (5).

3. The hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 2 is characterized in that: The rotating arm (5) comprises an arm plate (501), a through hole (505) is provided on the arm plate, one end of the connecting rod (401) passes through the through hole, and an adjusting nut is provided at the portion passing through the through hole.

4. A hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 2 or 3, characterized in that: The rotating arm (5) is provided with an over-shoulder bearing (504) at a portion where a through hole (505) is provided. The over-shoulder bearing comprises a pair of bearing seats, a through-rod hole seat is connected between the pair of bearing seats, and the hole of the through-rod hole seat is clearance-matched with the connecting rod (401), that is, the connecting rod and the over-shoulder bearing form a hinged relationship.

5. A hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 4, characterized in that Springs (402) are respectively provided on both sides of the connecting rod (401) and the rod-piercing hole seat, and the springs are positioned by adjusting nuts.

6. A hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 1 or 2, characterized in that: The top end of the rotating arm (5) is provided with a hinge seat (502) connected to the inner support frame of the dust cover (2); the other side of the rotating arm relative to the position where the steel pipe (12) is located is provided with a grinding wheel machine (503), which drives the grinding wheel (11) located at the lower end of the rotating arm.

7. The hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 1 is characterized in that: The driving wheels in the plurality of pairs of supporting wheels are connected in series to the same driving shaft (9), and the driving shaft is connected to the main driving device (8).

8. The hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 1 is characterized in that: Bearing seats (10) are respectively provided on both sides of the supporting wheel.

9. The hydraulic cantilever clamping type steel pipe outer circle polishing device according to claim 1, characterized in that: The acute angle formed between the wheel axle of the follower wheel and the center line of the steel pipe (12) is 1 to 10 degrees.

Images