Device for subsequent heat treatment of laser cladding plunger

Abstract

The utility model discloses a device for subsequent heat treatment of a laser cladding plunger, and relates to the technical field of hydraulic support repair. Comprising a pressurizing device and a tempering device, the pressurizing device comprises a workpiece positioning and rotating mechanism and a central pressing frame; the workpiece positioning and rotating mechanism is used for transversely fixing a plunger workpiece and can drive the plunger workpiece to rotate; an arc-shaped pressing plate is movably arranged on the top of the inner side of the center pressing frame and used for applying pressure to the plunger workpiece. The pressure applying face of the arc-shaped pressing plate is perpendicular to the axial direction of the plunger workpiece. The tempering device comprises a three-axis moving device and a laser; the laser is connected to the three-axis moving device, and the position, irradiated on the plunger workpiece, of a light spot of the laser is adjusted through the three-axis moving device. According to the utility model, the internal stress of the workpiece can be effectively released on the basis of ensuring straightening, the influence of subsequent processing on the workpiece is prevented, and the problems of massive rework and insufficient thickness of a functional layer in the traditional repair mode are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic support repair, in particular to a device for post-heat treatment of laser-clad pistons. Background Art

[0002] Hydraulic supports are the main equipment used to support coal mining in fully mechanized coal faces. Hydraulic supports mainly consist of hydraulic columns, jacks, roof plates, bases, rib protection plates, connecting rods, valve group lock blocks, and electro-hydraulic controls. Among them, the hydraulic column is the main equipment that uses hydraulic principles to support the roof of the coal mining face.

[0003] The hydraulic column is composed of three major components: an outer cylinder, a middle cylinder, and a piston. Among them, the piston is a key stress-bearing component that directly contacts the roof beam socket. Its repair level largely determines the product quality and service life of the hydraulic support. Through long-term exploration and practical experience, when the straightness > 1 / 1000, straightening is required. If the pressure is too high or material segregation occurs during the straightening process, fracture quality problems will occur.

[0004] For pistons with out-of-tolerance straightness, the general straightening method is to apply pressure to the high point of the piston using a large-tonnage press before laser cladding repair. After the dial indicator shows no obvious jump, the functional layer is turned, and then laser cladding is carried out. Since the straightened piston will produce straightness deformation of the column body when the pre-applied compressive stress meets heat during laser cladding, the piston can only be straightened by turning / grinding later, and after grinding, it is necessary to repeatedly perform laser cladding and grinding operations. This method will cause a large amount of rework, and at the same time, the thickness of the functional layer cannot be guaranteed. Content of the Utility Model

[0005] The utility model overcomes the deficiencies of the prior art and provides a device for post-heat treatment of laser-clad pistons, which solves the problems of a large amount of rework and insufficient functional layer thickness in traditional repair methods.

[0006] To achieve the above object, the utility model is realized by the following technical solutions.

[0007] A device for post-heat treatment of laser-clad pistons includes a bed body, on which a pressurizing device and a tempering device are arranged; the pressurizing device includes a workpiece positioning and rotating mechanism and a central pressure frame; the workpiece positioning and rotating mechanism includes a four-jaw chuck arranged on one side and a tailstock assembly arranged on the other side. One end of the piston workpiece is fixed by the four-jaw chuck, and the other end is fixed by the tailstock assembly; the central pressure frame is arranged in the middle of the piston workpiece, and the piston workpiece passes through the central pressure frame. At the top inside the central pressure frame, a pressure-applying jack is arranged, and the bottom of the moving end of the pressure-applying jack is connected with an arc-shaped pressing plate, and the arc-shaped pressing plate is used to apply pressure to the piston workpiece; the pressure-applying surface of the arc-shaped pressing plate is perpendicular to the axial direction of the piston workpiece.

[0008] The tempering device includes a three-axis moving device and a laser; the laser is connected to the three-axis moving device, and the position of the laser spot irradiating on the piston rod workpiece is adjusted by the three-axis moving device.

[0009] Furthermore, two parallel mounting rails are arranged on the bed body, and the pressurizing device and the tempering device are respectively connected to one mounting rail.

[0010] Furthermore, it further includes a spindle box which is fixedly arranged on the bed body. A stepping motor is arranged inside the spindle box, and the output shaft of the stepping motor is bolted to the four-jaw chuck through a flange.

[0011] Furthermore, the tailstock assembly is provided with a center point, and the center point is abutted against the center hole at the top of the piston rod workpiece.

[0012] Furthermore, it further includes a supporting jack. The bottom of the supporting jack is connected to the bed body, and the top of the supporting jack is connected with an arc-shaped supporting plate; the supporting plate is located below the piston rod workpiece and is used for lifting the piston rod workpiece.

[0013] Furthermore, the three-axis moving device includes a moving seat at the bottom, a supporting frame connected to the moving seat. A transverse rail is movably arranged on the supporting frame, a sliding seat is arranged on the transverse rail, and the laser is connected to the sliding seat.

[0014] Furthermore, the sliding seat is rotationally connected to the laser through a rotating shaft.

[0015] The beneficial effects of the present utility model compared with the prior art are as follows:

[0016] By using the device for subsequent heat treatment of laser cladding piston rod of the present utility model to pressurize and temper the workpiece between laser cladding and grinding, the internal stress of the workpiece can be effectively released on the basis of ensuring straightening, preventing the influence of subsequent processing on the workpiece, eliminating the need for repeated grinding in the future, reducing the repair and scrap rate of the piston rod, improving the processing efficiency of the piston rod with out-of-tolerance straightness, and ensuring the thickness and quality of the functional layer. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the pressurizing device of the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the tempering device of the present utility model;

[0019] In the figure: 1 - bed body, 2 - main spindle box, 21 - four-jaw chuck, 3 - tailstock assembly, 31 - center point, 4 - piston rod workpiece, 5 - supporting jack, 51 - supporting plate, 6 - center pressure frame, 61 - arc-shaped pressing plate, 7 - three-axis moving device, 71 - moving seat, 72 - support frame, 73 - transverse rail, 8 - sliding seat, 9 - laser. Specific implementation mode

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail in combination with the embodiments and the drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. The technical solutions of the present utility model will be described in detail below in combination with the embodiments and the drawings, but the protection scope is not limited by this.

[0021] See Figure 1 and Figure 2 As shown in and, this embodiment provides a device for post-heat treatment of laser cladding piston rod, including a bed body 1, on which a pressurizing device and a tempering device are arranged; two parallel installation rails are arranged on the bed body 1, and the pressurizing device and the tempering device are respectively connected to one installation rail.

[0022] The pressurizing device includes a workpiece positioning and rotating mechanism and a center pressure frame 6; the workpiece positioning and rotating mechanism includes a main spindle box 2 and a four-jaw chuck 21 arranged on one side and a tailstock assembly 3 arranged on the other side. One end of the piston rod workpiece 4 is fixed by the four-jaw chuck 21, and the other end is fixed by the tailstock assembly 3; specifically, the main spindle box 2 is fixedly arranged on the bed body 1, and a stepping motor is arranged inside the main spindle box 2. The output shaft of the stepping motor is connected to the four-jaw chuck 21 through a flange bolt. The tailstock assembly 3 is provided with a center point 31, which is abutted against the center hole at the top of the piston rod workpiece 4 through the center point 31. During installation, the tailstock assembly 3 is first slidably connected to one installation rail, and the position of the tailstock assembly 3 is adjusted according to the length of the piston rod workpiece 4 so that the center point 31 abuts against the center hole at the top of the piston rod workpiece 4, and then the tailstock assembly 31 is fixed to the bed body 1 by bolts.

[0023] A supporting jack 5 is also arranged on the same installation rail as the tailstock assembly 31 on the bed body 1. The bottom of the supporting jack 5 is connected to the bed body 1 by bolts, and the top of the supporting jack 5 is connected with an arc-shaped supporting plate 51; the supporting plate 51 is located below the piston rod workpiece 4 and is used to lift the piston rod workpiece 4.

[0024] The central pressing frame 6 is arranged in the middle of the moving column workpiece 4. The central pressing frame 6 is a frame body with a through middle part. The moving column workpiece 4 passes through the central pressing frame 6. A pressing jack is arranged at the top inside the central pressing frame 6. The bottom of the moving end of the pressing jack is connected with an arc-shaped pressing plate 61. The arc-shaped pressing plate 61 is used to apply pressure to the moving column workpiece 4. The pressing surface of the arc-shaped pressing plate 61 is perpendicular to the axis of the moving column workpiece 4.

[0025] The tempering device includes a three-axis moving device 7 and a laser 9. The laser 9 is connected to the three-axis moving device 7. The position where the laser spot of the laser 9 irradiates on the moving column workpiece 4 is adjusted through the three-axis moving device 7. Specifically, the three-axis moving device 7 includes a moving base 71 at the bottom, a support frame 72 connected to the moving base 71. A transverse rail 73 is movably arranged on the support frame 72. A sliding seat 8 is arranged on the transverse rail 73. The sliding seat 8 is rotatably connected to the laser 9 through a rotating shaft. The moving base 71 is slidably connected to another installation rail for adjusting the horizontal position of the laser 9 in the transverse direction. The transverse rail 73 can move up and down along the support frame 72 and is fixed by bolts after positioning for adjusting the height of the laser 9. The sliding seat 8 is slidably connected to the transverse rail 73 for adjusting the distance between the laser 9 and the moving column workpiece 4. Rotating the laser 9 through the rotating shaft is also for adjusting the laser 9 so that the rectangular laser spot emitted by the laser 9 can cover the axial position of the moving column workpiece 4 to the greatest extent.

[0026] The specific working process of the device for subsequent heat treatment of the moving column by laser cladding in this embodiment is as follows:

[0027] Fix the bed body 1 to the ground through 10 ear bolts on the front and rear sides. According to the diameter and length of the moving column workpiece 4, fix the main spindle box 2, tailstock assembly 3, supporting jack 5, and central pressing frame 6 on the bed body 1 through bottom transverse plate bolts. Adjust the four-jaw chuck 21 and the tailstock assembly 3 to clamp the moving column workpiece 4.

[0028] Rotate the four-jaw chuck 21 to make the high point of the moving column workpiece 4 directly above. Adjust the supporting plate 51 of the supporting jack 5 to make it fit the column body of the moving column workpiece 4. Adjust the arc-shaped pressing plate 61 of the central pressing frame 6 to make it fit the column body of the moving column workpiece 4. According to the out-of-straightness tolerance range, the pressing jack of the central pressing frame 6 pushes out the arc-shaped pressing plate 61 and keeps the pressure for 10 minutes. Subsequently, according to the surface runout condition of the column body measured by the dial indicator, repeat this process according to the runout of different high points of the column body.

[0029] After the previous process is completed, remove the supporting jack 5 and the center pressure frame 6. Adjust the position of the three-axis moving device 7, rotate the laser 9 so that its light spot covers the axial direction of the column, and then adjust the three-axis moving device 7. The laser 9 is raised 800 - 1500 mm above the normal laser cladding processing position (defocusing to enlarge the light spot, mainly for adjusting and reducing the irradiation temperature relative to the temperature of laser cladding to achieve tempering treatment). The stepping motor in the spindle box 2 starts to rotate. After the surface temperature of the column reaches 150 - 200 °C, reduce the power of the laser 9 and keep it warm for 1 - 2 hours.

[0030] By replacing the supporting plate 51 of the supporting jack 5 and the movable pressure plate 61 of the center pressure frame 6 with different specifications, this device can complete the subsequent heat treatment of the movable columns with diameters of 45 - 280 mm.

[0031] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present utility model are limited to this. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the premise of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the scope of patent protection determined by the claims submitted for the present utility model.

Claims

1. An apparatus for subsequent heat treatment of laser cladded plough bolts, characterized in that, It includes a bed body (1), on which a pressing device and a tempering device are arranged; the pressing device includes a workpiece positioning and rotating mechanism and a center pressing frame (6); the workpiece positioning and rotating mechanism includes a four-jaw chuck (21) arranged on one side and a tailstock assembly (3) arranged on the other side. One end of a piston rod workpiece (4) is fixed by the four-jaw chuck (21), and the other end is fixed by the tailstock assembly (3); the center pressing frame (6) is arranged in the middle of the piston rod workpiece (4), and the piston rod workpiece (4) passes through the center pressing frame (6). At the inner top of the center pressing frame (6), a pressing jack is arranged, and the bottom of the moving end of the pressing jack is connected with an arc-shaped pressing plate (61), and the arc-shaped pressing plate (61) is used for applying pressure to the piston rod workpiece (4); the pressing surface of the arc-shaped pressing plate (61) is perpendicular to the axial direction of the piston rod workpiece (4). The tempering device includes a three-axis moving device (7) and a laser (9); the laser (9) is connected to the three-axis moving device (7), and the position where the laser spot of the laser (9) irradiates on the piston rod workpiece (4) is adjusted by the three-axis moving device (7).

2. The device for subsequent heat treatment of laser cladding plough columns according to claim 1, characterized in that, Two parallel installation tracks are arranged on the bed body (1), and the pressing device and the tempering device are respectively connected to one installation track.

3. A device for subsequent heat treatment of a laser-clad prop, according to claim 1, characterized in that, It also includes a spindle box (2), the spindle box (2) is fixedly arranged on the bed body (1), a stepping motor is arranged in the spindle box (2), and the output shaft of the stepping motor is connected with the four-jaw chuck (21) through flange bolts.

4. A device for subsequent heat treatment of a laser-clad prop, according to claim 1, characterized in that, The tailstock assembly (3) is provided with a center point (31), and the center point (31) abuts against the center hole at the top of the piston rod workpiece (4).

5. A device for subsequent heat treatment of a laser-clad prop, according to claim 1, characterized in that It also includes a supporting jack (5), the bottom of the supporting jack (5) is connected to the bed body (1), and the top of the supporting jack (5) is connected with an arc-shaped supporting plate (51); the supporting plate (51) is located below the piston rod workpiece (4) and is used for lifting the piston rod workpiece (4).

6. The device for subsequent heat treatment of a laser-clad prop according to claim 1, characterized in that, The three-axis moving device (7) includes a moving base (71) at the bottom, a supporting frame (72) connected to the moving base (71), a transverse track (73) movably arranged on the supporting frame (72), a sliding seat (8) arranged on the transverse track (73), and the laser (9) is connected to the sliding seat (8).

7. The device for subsequent heat treatment of laser-clad props according to claim 6, characterized in that, The sliding seat (8) is rotationally connected to the laser (9) through a rotating shaft.

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