Metal part surface blackening treatment device

Abstract

The invention relates to the technical field of metal part machining, in particular to a metal part surface blackening treatment device which comprises a limiting box, a soaking shell is placed in the limiting box, a movable arm is arranged above the soaking shell, a rotating ring is rotatably connected to the movable arm, a sealing pipe is fixedly connected to the interior of the rotating ring, and the sealing pipe is fixedly connected to the interior of the soaking shell. A plurality of sliding frames are fixedly connected to the surface of the sealing pipe in the circumferential direction, sliding blocks are slidably connected to the interiors of the sliding frames, round rods are fixedly inserted into the sliding blocks, and clamping jaws are fixedly connected to the bottom ends of the round rods; according to the metal part surface blackening device, the multiple clamping jaws are sequentially away from one another, so that the surfaces of metal parts can be in full contact reaction with a diluted blackening agent, the uniformity degree of surface blackening treatment of the metal parts is guaranteed, the metal parts are driven by the clamping jaws to rotate, and the compactness degree of black oxidation films on the surfaces of the metal parts is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal parts processing, in particular to a device for blackening the surface of metal parts. Background Art

[0002] Black oxidation is a common chemical surface treatment method. It creates an oxide film on the metal surface to isolate it from air and prevent rust. This process typically involves pre-treating the metal, including degreasing, rust removal, and degreasing. The pre-treated metal parts are then immersed in a blackening agent, where a chemical reaction forms a dense black oxide film on the metal surface.

[0003] The patent document with publication number CN221759981 U discloses a device for blackening the surface of metal parts, including an immersion box, a pressure plate and a discharge frame. A pressure plate is slidably connected to the immersion box, and the top of the pressure plate is connected to a sleeve by a bolt. A sleeve rod is sleeved inside the sleeve, and the sleeve rod passes through the pressure plate. One end of the sleeve rod is located at the bottom of the pressure plate and is connected to the discharge frame by bolts. A spring is provided on the outer periphery of the sleeve rod in the sleeve, and an inflatable strip is connected to the top of the sleeve rod in the sleeve by gluing.

[0004] In the prior art, when performing blackening treatment on the surface of metal parts, the metal parts are usually hung by hooks or directly placed in the blackening agent, which causes the metal parts to always maintain a single contact with the clamping device or liquid storage device, resulting in poor blackening treatment effect at the contact position of the metal parts, affecting the integrity of the blackening treatment of the metal parts. When the metal is blackened at room temperature, the blackening agent needs to be diluted with water, so that when the metal parts are immersed in the blackening agent for blackening treatment, the concentration of the blackening agent gradually decreases, thereby reducing the blackening treatment effect of subsequent metal parts and affecting the continuous blackening treatment of the metal parts. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device for blackening the surface of metal parts.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows: a device for blackening the surface of a metal part, comprising a limit box, an immersion shell placed inside the limit box, a movable arm provided above the immersion shell, a rotating ring rotatably connected to the movable arm, a sealing tube fixedly connected to the interior of the rotating ring, a plurality of sliding frames fixedly connected to the surface of the sealing tube along the circumferential direction, sliders slidably connected to the interiors of the sliding frames, circular rods fixedly inserted on the sliders, clamping claws fixedly connected to the bottom ends of the circular rods, a one-way rotating mechanism connected to the rotating ring, and a vertical lifting mechanism connected to the movable arm;

[0007] The surface of the sealing tube is provided with a plurality of sector blocks along the circumferential direction, and a guide groove is commonly provided at the bottom of the plurality of sector blocks, wherein the guide groove comprises an arc segment and a convex segment, the circular rods correspond to the sector blocks one by one, and the top ends of the circular rods are all located inside the guide grooves, and the sector blocks are connected to a movable diffusion mechanism;

[0008] A fluid infusion cylinder is fixedly connected to the movable arm, a first liquid pump is fixedly installed on the bottom of the fluid infusion cylinder, a first communicating tube is fixedly connected between the bottom of the fluid infusion cylinder and the liquid inlet end of the first liquid pump, an annular shell is rotatably connected to the surface of the sealing tube, a second communicating tube is fixedly connected between the annular shell and the liquid outlet end of the first liquid pump, a liquid inlet hole is opened on the sealing tube, and the liquid inlet hole is located inside the annular shell, a plurality of discharge pipes are fixedly connected along the circumferential direction below the surface of the sealing tube, an overflow valve is fixedly installed on the discharge pipe, and a liquid level sensor is fixedly installed on the bottom of the sealing tube.

[0009] Preferably, the movable diffusion mechanism includes a mounting plate, which is fixedly connected to the movable arm, the sealing tube sleeve is arranged inside the mounting plate, and a plurality of limit grooves are opened on the mounting plate in a circumferential direction, the tops of the sector blocks are fixedly connected to the limit blocks, and the limit blocks are slidably connected to the corresponding limit grooves, and the tops of the limit blocks are fixedly connected to circular pins, and the top of the mounting plate is rotatably connected to a circular disk, and a plurality of inclined grooves are opened on the circular disk in a circumferential direction, and the circular pins are respectively located in the corresponding inclined grooves, and the surface of the circular disk is fixedly connected to an outer gear ring, and a first motor is fixedly installed on the mounting plate, and a first transmission gear is fixedly connected to the output shaft of the first motor, and the first transmission gear is meshed with the outer gear ring.

[0010] Preferably, the one-way rotation mechanism includes a mating gear, which is fixedly connected to the rotating ring. A second motor is fixedly mounted on the movable arm, and a second transmission gear is fixedly connected to the output shaft of the second motor. The second transmission gear is meshed with the mating gear.

[0011] Preferably, a plurality of stirring blades are fixedly connected to the surface of the sealing tube along the circumferential direction, and the drain pipe is located between two adjacent stirring blades.

[0012] Preferably, the clamping jaw is made of flexible plastic material, and the surface of the clamping jaw is coated with a silicon dioxide coating.

[0013] Preferably, the vertical lifting mechanism includes a connecting support, which is fixedly connected to one side of the limit box, a rotating shaft is rotatably connected to the connecting support, the movable arm is slidably inserted on the rotating shaft, the surface of the rotating shaft is fixedly connected to the limit plate, the top of the limit plate is fixedly connected to a plurality of limit pins, the limit pins are all slidably inserted on the movable arm, a hydraulic cylinder is fixedly installed on the limit plate, the piston shaft of the hydraulic cylinder is fixedly connected to the bottom of the movable arm, and a positioning mechanism is connected between the connecting support and the rotating shaft.

[0014] Preferably, the positioning mechanism includes a rotating rod, which is slidably inserted on the rotating shaft, a threaded hole is opened on one side of the limit box, one end of the rotating rod is fixedly connected to a screw rod, one end of the screw rod is threadedly connected to the inside of the threaded hole, and the other end of the rotating rod is fixedly connected to a shift rod.

[0015] Preferably, an ultrasonic generator is fixedly mounted on the bottom of the immersion shell, and a transducer is fixedly mounted on the ultrasonic generator.

[0016] Preferably, a second liquid pump is fixedly installed at the bottom of the immersion shell, the liquid inlet end of the second liquid pump is fixedly connected to a filter, a third connecting pipe is fixedly connected between the filter and the immersion shell, and a fourth connecting pipe is fixedly connected between the liquid outlet end of the second liquid pump and the immersion shell.

[0017] Preferably, pull rings are fixedly connected to both sides of the top of the immersion shell, and the sides of the pull rings are provided with arc surfaces.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By moving multiple jaws away from each other in sequence, the surface of the metal parts can fully contact and react with the diluted blackening agent to ensure the uniformity of the blackening treatment on the surface of the metal parts. The metal parts are driven to rotate by the jaws to reduce the adhesion of bubbles on the surface of the metal parts and improve the density of the black oxide film on the surface of the metal parts.

[0020] 2. The liquid level sensor at the bottom end of the circular rod contacts the diluted blackening agent and sends a signal. The controller connected to the liquid level sensor controls the first liquid pump to start working, so that the blackening agent liquid inside the refill cylinder is transported along the first connecting pipe to the first liquid pump, and is transported to the inside of the annular shell through the second connecting pipe. The annular shell and the sealing tube are rotated to connect, so that the blackening agent liquid enters the inside of the sealing tube along the connection between the annular shell and the liquid inlet, and enters the inside of multiple drainage pipes. The hydraulic pressure generated by the operation of the first liquid pump opens the overflow valve path, so that the blackening agent liquid is discharged along the drainage pipe and mixed with the diluted blackening agent inside the immersion shell. When the metal parts are blackened inside the immersion shell, the concentration of the diluted blackening agent inside the immersion shell is supplemented, reducing the influence of the blackening agent concentration on the subsequent metal parts processing, and ensuring the continuous blackening treatment effect of the metal parts.

[0021] 3. Through the limiting and guiding effect of the inclined groove on the circular pin, the circular pin drives the limiting block to move inside the limiting groove, so that the multiple fan-shaped blocks move outward synchronously along the axis of the sealing tube and spread, and through the limiting effect of the guide groove on the circular rod, the circular rod drives the clamping claws to move synchronously, so that the clamping claws are expanded. When the output shaft of the first motor rotates in the opposite direction, the multiple clamping claws are synchronously retracted toward the axis of the sealing tube and contact and clamp the metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement at point A;

[0024] Figure 3 This is a schematic diagram of a first matching structure of the movable arm, the sealing tube and the clamping claw of the present invention;

[0025] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in FIG.

[0026] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at position C in FIG;

[0027] Figure 6 This is a schematic diagram of a second matching structure of the movable arm, the sealing tube and the clamping claw of the present invention;

[0028] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at D in FIG.

[0029] Figure 8 This is a schematic diagram of a first matching structure of a sector block and a mounting plate of the present invention;

[0030] Figure 9 This is a schematic diagram of a second matching structure between the sector block and the mounting plate of the present invention;

[0031] Figure 10 Schematic diagram of the sealing tube and the fluid infusion cartridge of the present invention (the annular housing is cut away);

[0032] Figure 11 For the present invention Figure 10 A schematic diagram of the structure at E in FIG.

[0033] Figure 12 This is a schematic diagram of the coordination structure of the immersion shell, ultrasonic generator and second liquid pump of the present invention.

[0034] In the figure: 1, limit box; 2, immersion shell; 3, movable arm; 4, rotating ring; 5, sealing tube; 6, sliding frame; 7, slider; 8, circular rod; 9, clamping claw; 10, sector block; 11, guide groove; 1101, arc segment; 1102, raised segment; 12, liquid replenishing cylinder; 13, first liquid pump; 14, first connecting pipe; 15, annular shell; 16, second connecting pipe; 17, liquid inlet hole; 18, liquid discharge pipe; 19, overflow valve; 20, liquid level sensor; 21, mounting plate; 22, limit groove; 23, limit block; 24, circular pin; 2 5. Circular disk; 26. Inclined groove; 27. Outer gear ring; 28. First motor; 29. First transmission gear; 30. Matching gear; 31. Second motor; 32. Second transmission gear; 33. Stirring blade; 34. Connecting support; 35. Rotating shaft; 36. Limiting plate; 37. Limiting pin; 38. Hydraulic cylinder; 39. Rotating rod; 40. Threaded hole; 41. Screw; 42. Push rod; 43. Ultrasonic generator; 44. Transducer; 45. Second liquid pump; 46. Filter; 47. Third connecting pipe; 48. Fourth connecting pipe; 49. Pull ring. DETAILED DESCRIPTION

[0035] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0036] like Figures 1 to 12 The device for blackening the surface of a metal part shown in the figure comprises a limit box 1, an immersion shell 2 is placed inside the limit box 1, a movable arm 3 is provided above the immersion shell 2, a rotating ring 4 is rotatably connected to the movable arm 3, a sealing tube 5 is fixedly connected to the interior of the rotating ring 4, a plurality of sliding frames 6 are fixedly connected to the surface of the sealing tube 5 along the circumferential direction, a slider 7 is slidably connected to the interior of each sliding frame 6, a round rod 8 is fixedly inserted on each slider 7, a clamping claw 9 is fixedly connected to the bottom end of each round rod 8, a one-way rotation mechanism is connected to the rotating ring 4, and a vertical lifting mechanism is connected to the movable arm 3;

[0037] The surface of the sealing tube 5 is provided with a plurality of sector blocks 10 along the circumferential direction, and the bottoms of the plurality of sector blocks 10 are provided with a guide groove 11 (such as Figure 9 As shown), the guide groove 11 includes an arc segment 1101 and a raised segment 1102, the circular rod 8 and the sector block 10 correspond one to one, the top of the circular rod 8 is located inside the guide groove 11, and the sector block 10 is connected to a mobile diffusion mechanism;

[0038] The movable arm 3 is fixedly connected to a fluid infusion cylinder 12, a first liquid pump 13 is fixedly installed at the bottom of the fluid infusion cylinder 12, and a first connecting pipe 14 (such as Figure 11 As shown), the surface of the sealing tube 5 is rotatably connected to an annular shell 15, and a second connecting pipe 16 is fixedly connected between the annular shell 15 and the liquid outlet end of the first liquid pump 13. A liquid inlet hole 17 is opened on the sealing tube 5, and the liquid inlet hole 17 is located inside the annular shell 15. A plurality of discharge pipes 18 (as shown) are fixedly connected to the bottom of the surface of the sealing tube 5 along the circumferential direction. Figure 5As shown), an overflow valve 19 is fixedly installed on the discharge pipe 18, and a liquid level sensor 20 is fixedly installed on the bottom of the sealing tube 5; during operation, in the prior art, when performing blackening treatment on the surface of metal parts, the metal parts are usually hung by hooks or directly placed in the blackening agent, which causes the metal parts to always maintain a single contact with the clamping device or the liquid storage device, resulting in poor blackening treatment effect at the contact position of the metal parts, affecting the integrity of the blackening treatment of the metal parts. When the metal is subjected to room temperature blackening treatment, the blackening agent needs to be diluted with water, so that when the metal parts are immersed in the blackening agent for blackening treatment, the concentration of the blackening agent gradually decreases, thereby reducing the blackening treatment effect of subsequent metal parts and affecting the continuous blackening treatment of the metal parts; the present technical method The scheme can solve the above problems, and the specific working method is as follows: through the action of the mobile diffusion mechanism, the multiple sector blocks 10 are driven to move away synchronously along the surface of the sealing tube 5, and the guide groove 11 has a limiting effect on the top of the circular rod 8, so that the sector blocks 10 drive the corresponding circular rod 8 to move synchronously. During the movement of the circular rod 8, the slider 7 slides along the corresponding sliding frame 6, so that the multiple circular rods 8 drive the clamps 9 to spread and expand, and then place the metal parts from the bottom of the multiple clamps 9 to between the multiple clamps 9, and drive the multiple sector blocks 10 to return to the initial position through the reverse action of the mobile diffusion mechanism, so that the multiple clamps 9 are closed and the metal parts are limitedly clamped, and then the movable arm 3 is driven vertically downward through the action of the vertical lifting mechanism. The rotating ring 4 is driven by the one-way rotation mechanism to rotate, and the rotating ring 4 drives the sealing tube 5 to rotate synchronously, so that the multiple circular rods 8 drive the corresponding clamping jaws 9 to rotate. When the top end of the circular rod 8 is located inside the circular arc segment 1101 of the guide groove 11, the corresponding clamping jaws 9 approach the metal part and clamp the surface of the metal part. When the top end of one circular rod 8 is located inside the convex section 1102 of the guide groove 11, the corresponding clamping jaws 9 are away from the metal part and do not participate in the contact clamping of the metal part. As the sealing tube 5 rotates, the multiple circular rods 8 enter the convex section 1102 from the inside of the circular arc segment 1101 in turn. The inside of the starting section 1102 is formed, so that the multiple clamping jaws 9 are separated from the surface of the metal part in turn and released from the clamping. When the corresponding clamping jaws 9 are released, the remaining clamping jaws 9 all contact and clamp the surface of the metal part, thereby ensuring the stability of the metal part clamping. The multiple clamping jaws 9 are separated in turn so that the surface of the metal part can fully contact and react with the diluted blackening agent, ensuring the uniformity of the blackening treatment on the surface of the metal part. The metal part is driven to rotate by the clamping jaws 9, reducing the adhesion of bubbles on the surface of the metal part and improving the density of the black oxide film on the surface of the metal part. When the circular rod 8 moves vertically downward with the movable arm 3 and enters the interior of the immersion shell 2, the liquid level sensor 20 at the bottom end of the circular rod 8 contacts the diluted blackening agent and sends a signal.The controller connected to the liquid level sensor 20 controls the first liquid pump 13 to start working, so that the blackening agent liquid inside the liquid replenishing cylinder 12 is transported to the first liquid pump 13 along the first connecting pipe 14, and is transported to the inside of the annular shell 15 through the second connecting pipe 16. The annular shell 15 and the sealing tube 5 are rotated and connected, so that the blackening agent liquid enters the inside of the sealing tube 5 along the connection between the annular shell 15 and the liquid inlet hole 17, and enters the inside of multiple drainage pipes 18. The hydraulic pressure generated by the operation of the first liquid pump 13 opens the valve path of the overflow valve 19, so that the blackening agent liquid is discharged along the drainage pipe 18 and mixed in the diluted blackening agent inside the immersion shell 2, so that when the metal parts are blackened inside the immersion shell 2, the immersion The diluted blackening agent concentration inside the immersion shell 2 is replenished to reduce the impact of the blackening agent concentration on subsequent metal part processing, ensuring the continuous blackening treatment effect of the metal parts. When the blackening treatment of the metal parts is completed, the sealing tube 5 rotates to the initial position, ensuring that the circular rod 8 is directly below the corresponding sector block 10 and moves upward. The liquid level sensor 20 is separated from the diluted blackening agent and stops sending signals. The controller connected to the liquid level sensor 20 controls the first liquid pump 13 to stop working. The overflow valve 19 immediately closes the valve passage after losing hydraulic action, thereby preventing the remaining blackening agent liquid inside the sealing tube 5 from continuing to replenish the interior of the immersion shell 2 along the drain pipe 18, ensuring the accuracy of the blackening agent concentration replenishment.

[0039] As a further embodiment of the present invention, the mobile diffusion mechanism includes a mounting plate 21, the mounting plate 21 is fixedly connected to the movable arm 3, the sealing tube 5 is sleeved inside the mounting plate 21, and a plurality of limiting grooves 22 (such as Figure 8As shown), the tops of the sector blocks 10 are fixedly connected to the limit blocks 23, and the limit blocks 23 are slidably connected to the corresponding limit grooves 22. The tops of the limit blocks 23 are fixedly connected to circular pins 24. The top of the mounting plate 21 is rotatably connected to a circular disk 25. A plurality of inclined grooves 26 are provided on the circular disk 25 along the circumferential direction. The circular pins 24 are respectively located in the corresponding inclined grooves 26. The surface of the circular disk 25 is fixedly connected to an outer gear ring 27. A first motor 28 is fixedly installed on the mounting plate 21. A first transmission gear 29 is fixedly connected to the output shaft of the first motor 28. The first transmission gear 29 is meshed with the outer gear ring 27. When working, the first transmission gear 29 is driven to rotate by the output shaft of the first motor 28. The circular disc 25 rotates along the rotating connection of the mounting plate 21 through the meshing action of the first transmission gear 29 and the outer gear ring 27, and drives the multiple inclined grooves 26 to rotate synchronously. The inclined groove 26 limits and guides the circular pin 24, so that the circular pin 24 drives the limit block 23 to move inside the limit groove 22, so that the multiple sector blocks 10 move outward and diffuse synchronously along the axis of the sealing tube 5, and the guide groove 11 limits the circular rod 8, so that the circular rod 8 drives the clamping jaws 9 to move synchronously, so that the clamping jaws 9 are expanded. When the output shaft of the first motor 28 rotates in the opposite direction, the multiple clamping jaws 9 are synchronously retracted toward the axis of the sealing tube 5 and contact and clamp the metal parts.

[0040] As a further embodiment of the present invention, the one-way rotation mechanism includes a mating gear 30, which is fixedly connected to the rotating ring 4, and a second motor 31 is fixedly installed on the movable arm 3. A second transmission gear 32 is fixedly connected to the output shaft of the second motor 31, and the second transmission gear 32 and the mating gear 30 are meshed with each other; when working, the second transmission gear 32 is driven to rotate in one direction by the output shaft of the second motor 31, and the meshing action of the second transmission gear 32 and the mating gear 30 drives the rotating ring 4 to rotate along the rotating connection of the movable arm 3, thereby rotating the sealing tube 5.

[0041] As a further embodiment of the present invention, a plurality of stirring blades 33 are fixedly connected to the surface of the sealing tube 5 along the circumferential direction, and the drainage pipe 18 is located between two adjacent stirring blades 33; during operation, by connecting a plurality of stirring blades 33 on the surface of the sealing tube 5, the blackening agent concentrate is transported along the drainage pipe 18 to the inside of the diluted blackening agent, and the stirring blades 33 rotate with the sealing tube 5, and the blackening agent concentrate and the diluted blackening agent are quickly stirred, thereby improving the mixing effect of the diluted blackening agent.

[0042] As a further embodiment of the present invention, the clamping jaw 9 is made of flexible plastic material, and the surface of the clamping jaw 9 is coated with a silicon dioxide coating; when working, when the clamping jaw 9 clamps the metal part, the flexible plastic material of the clamping jaw 9 can reduce the damage to the surface of the metal part caused by clamping, and the oleophobicity of the silicon dioxide coating can effectively reduce the blackening agent residue on the surface of the clamping jaw 9, thereby reducing the effect of the clamping jaw 9 on the dilution of the blackening agent concentration.

[0043] As a further implementation scheme of the present invention, the vertical lifting mechanism includes a connecting support 34, which is fixedly connected to one side of the limit box 1, and a rotating shaft 35 is rotatably connected to the connecting support 34. The movable arm 3 is slidably inserted on the rotating shaft 35. The surface of the rotating shaft 35 is fixedly connected to the limiting plate 36, and the top of the limiting plate 36 is fixedly connected to multiple limiting pins 37. The limiting pins 37 are all slidably inserted on the movable arm 3. A hydraulic cylinder 38 is fixedly installed on the limiting plate 36, and the piston shaft of the hydraulic cylinder 38 is fixedly connected to the bottom of the movable arm 3. A positioning mechanism is connected between the connecting support 34 and the rotating shaft 35; when working, the piston shaft of the hydraulic cylinder 38 moves downward, driving the movable arm 3 to move downward along the sliding connection of the rotating shaft 35, and the movable arm 3 is limited by the limiting pin 37, so that the movable arm 3 is vertically lowered, and when the piston shaft of the hydraulic cylinder 38 moves in the opposite direction, the movable arm 3 moves upward.

[0044] As a further embodiment of the present invention, the positioning mechanism includes a rotating rod 39, which is slidably inserted on the rotating shaft 35. A threaded hole 40 is opened on one side of the limit box 1, and one end of the rotating rod 39 is fixedly connected to a screw 41, one end of the screw 41 is threadedly connected to the inside of the threaded hole 40, and the other end of the rotating rod 39 is fixedly connected to a shift rod 42; when working, the screw 41 is threadedly connected inside the threaded hole 40, and the rotating rod 39 and the rotating shaft 35 are slidably inserted, thereby limiting the rotation of the rotating shaft 35 on the connecting support 34, and by rotating the shift rod 42, the rotating rod 39 and the screw 41 rotate synchronously, so that the screw 41 rotates out of the threaded hole 40 and releases the rotation restriction of the rotating shaft 35, so that the rotating shaft 35 can drive the movable arm 3 to rotate to one side, thereby releasing the blocking of the clamping claw 9 and the sealing tube 5 above the soaking shell 2, so that the soaking shell 2 can be taken out from the inside of the limit box 1 and the discarded diluted blackening agent can be processed and replaced.

[0045] As a further embodiment of the present invention, an ultrasonic generator 43 is fixedly installed at the bottom of the immersion shell 2, and a transducer 44 is fixedly installed on the ultrasonic generator 43; when working, a high-frequency electrical signal is generated by the ultrasonic generator 43, and is converted into mechanical vibration through the transducer 44, so that the diluted blackening agent vibrates at a high frequency through contact conduction of the immersion shell 2, thereby improving the contact efficiency between the metal parts and the diluted blackening agent and reducing the chemical reaction time.

[0046] As a further embodiment of the present invention, a second liquid pump 45 is fixedly installed at the bottom of the immersion shell 2, and the liquid inlet end of the second liquid pump 45 is fixedly connected to a filter 46, a third connecting pipe 47 is fixedly connected between the filter 46 and the immersion shell 2, and a fourth connecting pipe 48 is fixedly connected between the liquid outlet end of the second liquid pump 45 and the immersion shell 2; when working, the second liquid pump 45 works to make the diluted blackening agent inside the immersion shell 2 enter the filter 46 along the third connecting pipe 47, and the fixed impurities doped in the diluted blackening agent are filtered and collected by the filter 46, and then the diluted blackening agent enters the second liquid pump 45 and re-enters the immersion shell 2 along the fourth connecting pipe 48, so that the diluted blackening agent inside the immersion shell 2 circulates in one direction, and continuously filters solid impurities during the circulation process, effectively increasing the number of times the diluted blackening agent is used and reducing the influence of impurities on the blackening treatment of the surface of metal parts.

[0047] As a further implementation scheme of the present invention, pull rings 49 are fixedly connected to both sides of the top of the immersion shell 2, and the side edges of the pull rings 49 are provided with arc surfaces; during operation, by fixing the pull ring 49 on the top of the immersion shell 2, it is convenient to remove the immersion shell 2 from the inside of the limit box 1 and to process and replace the discarded diluted blackening agent.

[0048] Working principle of the present invention:

[0049] The plurality of sector blocks 10 are driven to move away synchronously along the surface of the sealing tube 5 by the action of the mobile diffusion mechanism, and the limiting effect of the guide groove 11 on the top end of the circular rod 8 causes the sector blocks 10 to drive the corresponding circular rod 8 to move synchronously. During the movement of the circular rod 8, the slider 7 slides along the corresponding sliding frame 6, so that the plurality of circular rods 8 drive the clamps 9 to spread out, and then place the metal parts from the bottom of the plurality of clamps 9 between the plurality of clamps 9, and drive the plurality of sector blocks 10 to return to the initial position by the reverse action of the mobile diffusion mechanism, so that the plurality of clamps 9 close and limit the clamping of the metal parts, and then drive the movable arm 3 to descend vertically by the action of the vertical lifting mechanism, and drive the sealing tube 5 and the plurality of clamps 9 to descend synchronously, so that The metal part moves downward and is immersed in the diluted blackening agent inside the immersion shell 2, and then the rotating ring 4 is driven to rotate by the action of the one-way rotation mechanism. The rotating ring 4 drives the sealing tube 5 to rotate synchronously, so that the multiple circular rods 8 drive the corresponding clamping jaws 9 to rotate. When the top end of the circular rod 8 is located inside the circular arc segment 1101 of the guide groove 11, the corresponding clamping jaw 9 approaches the metal part and clamps the surface of the metal part. When the top end of one of the circular rods 8 is located inside the raised section 1102 of the guide groove 11, the corresponding clamping jaw 9 is away from the metal part and does not participate in the contact clamping of the metal part. As the sealing tube 5 rotates, the multiple circular rods 8 enter the raised section 1102 from the inside of the circular arc segment 1101 in turn, so that the multiple clamping jaws 9 are away from the metal part in turn. The surface of the metal part is clamped and released, and when the corresponding clamping jaws 9 are released, the remaining clamping jaws 9 all contact and clamp the surface of the metal part, thereby ensuring the stability of the metal part clamping, and through the sequential separation of multiple clamping jaws 9, the surface of the metal part can fully contact and react with the diluted blackening agent, ensuring the uniformity of the blackening treatment on the surface of the metal part, and the metal part is driven to rotate by the clamping jaws 9, reducing the adhesion of bubbles on the surface of the metal part and improving the density of the black oxide film on the surface of the metal part. When the circular rod 8 moves vertically downward with the movable arm 3 and enters the interior of the immersion shell 2, the liquid level sensor 20 at the bottom end of the circular rod 8 contacts the diluted blackening agent and sends a signal, and the controller connected to the liquid level sensor 20 controls the first liquid pump 13 to start The first liquid pump 13 starts working, so that the blackening agent liquid inside the liquid replenishing cylinder 12 is transported to the first liquid pump 13 along the first connecting pipe 14, and is transported to the inside of the annular shell 15 through the second connecting pipe 16. Through the rotation connection between the annular shell 15 and the sealing tube 5, the blackening agent liquid enters the inside of the sealing tube 5 along the connection between the annular shell 15 and the liquid inlet hole 17, and enters the inside of the multiple drainage pipes 18. The hydraulic pressure generated by the operation of the first liquid pump 13 opens the valve path of the overflow valve 19, so that the blackening agent liquid is discharged along the drainage pipe 18 and mixed with the diluted blackening agent inside the immersion shell 2. When the metal parts are blackened inside the immersion shell 2, the concentration of the diluted blackening agent inside the immersion shell 2 is supplemented, thereby reducing the influence of the blackening agent concentration on the subsequent metal parts processing.To ensure continuous blackening treatment of metal parts, after the blackening treatment is completed, the sealing tube 5 rotates to its initial position, ensuring that the circular rod 8 is directly below the corresponding sector block 10 and moves upward. The liquid level sensor 20 disengages from the diluted blackening agent and stops sending signals. The controller connected to the liquid level sensor 20 controls the first liquid pump 13 to stop operation. The overflow valve 19 immediately closes the valve passage after losing hydraulic pressure, thereby preventing the remaining blackening agent liquid in the sealing tube 5 from continuing to replenish the interior of the immersion shell 2 through the drain pipe 18, ensuring the accuracy of the blackening agent replenishment concentration.

[0050] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention as claimed, and the scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for blackening the surface of a metal part, comprising a limit box, characterized in that: An immersion shell is placed inside the limit box, a movable arm is provided above the immersion shell, a rotating ring is rotatably connected to the movable arm, a sealing tube is fixedly connected to the inside of the rotating ring, a plurality of sliding frames are fixedly connected to the surface of the sealing tube along the circumferential direction, sliders are slidably connected to the inside of the sliding frames, a round rod is fixedly inserted on the sliders, a clamping claw is fixedly connected to the bottom end of the round rod, a one-way rotating mechanism is connected to the rotating ring, and a vertical lifting mechanism is connected to the movable arm; The surface of the sealing tube is provided with a plurality of sector blocks along the circumferential direction. A guide groove is provided at the bottom of the plurality of sector blocks. The guide groove includes an arc segment and a convex segment. The circular rods and the sector blocks correspond one to one. The top ends of the circular rods are all located inside the guide grooves. The sector blocks are connected to a mobile diffusion mechanism. A fluid infusion cylinder is fixedly connected to the movable arm, a first liquid pump is fixedly installed on the bottom of the fluid infusion cylinder, a first connecting pipe is fixedly connected between the bottom of the fluid infusion cylinder and the liquid inlet end of the first liquid pump, an annular shell is rotatably connected to the surface of the sealing tube, a second connecting pipe is fixedly connected between the annular shell and the liquid outlet end of the first liquid pump, a liquid inlet hole is opened on the sealing tube, the liquid inlet hole is located inside the annular shell, a plurality of discharge pipes are fixedly connected along the circumferential direction below the surface of the sealing tube, an overflow valve is fixedly installed on the discharge pipe, and a liquid level sensor is fixedly installed at the bottom of the sealing tube.

2. A metal parts surface blackening treatment device according to claim 1, characterized in that: The mobile diffusion mechanism includes a mounting plate, which is fixedly connected to the movable arm, and a sealing tube sleeve is arranged inside the mounting plate. A plurality of limit grooves are provided on the mounting plate in a circumferential direction. The tops of the sector blocks are fixedly connected to the limit blocks, and the limit blocks are slidably connected to the corresponding limit grooves. The tops of the limit blocks are fixedly connected to circular pins. The top of the mounting plate is rotatably connected to a circular disk, and a plurality of inclined grooves are provided on the circular disk in a circumferential direction. The circular pins are respectively located in the corresponding inclined grooves. The surface of the circular disk is fixedly connected to an outer gear ring. A first motor is fixedly installed on the mounting plate, and a first transmission gear is fixedly connected to the output shaft of the first motor. The first transmission gear is meshed with the outer gear ring.

3. The device for blackening the surface of a metal part according to claim 1, characterized in that: The one-way rotation mechanism includes a matching gear, which is fixedly connected to the rotating ring. A second motor is fixedly installed on the movable arm. A second transmission gear is fixedly connected to the output shaft of the second motor. The second transmission gear is meshed with the matching gear.

4. The device for blackening the surface of a metal part according to claim 1, characterized in that: A plurality of stirring blades are fixedly connected to the surface of the sealing tube along the circumferential direction, and the liquid discharge pipe is located between two adjacent stirring blades.

5. The device for blackening the surface of a metal part according to claim 1, characterized in that: The gripper jaws are made of flexible plastic and are coated with silicon dioxide.

6. The device for blackening the surface of a metal part according to claim 1, characterized in that: The vertical lifting mechanism includes a connecting support, which is fixedly connected to one side of the limit box. A rotating shaft is rotatably connected to the connecting support. The movable arm is slidably inserted on the rotating shaft. The surface of the rotating shaft is fixedly connected to the limit plate. The top of the limit plate is fixedly connected to multiple limit pins. The limit pins are all slidably inserted on the movable arm. A hydraulic cylinder is fixedly installed on the limit plate. The piston shaft of the hydraulic cylinder is fixedly connected to the bottom of the movable arm. A positioning mechanism is connected between the connecting support and the rotating shaft.

7. The device for blackening the surface of a metal part according to claim 6, characterized in that: The positioning mechanism includes a rotating rod, which is slidably inserted on the rotating shaft. A threaded hole is opened on one side of the limit box. One end of the rotating rod is fixedly connected to a screw rod, one end of the screw rod is threadedly connected to the inside of the threaded hole, and the other end of the rotating rod is fixedly connected to a shift rod.

8. The device for blackening the surface of a metal part according to claim 1, characterized in that: An ultrasonic generator is fixedly installed on the bottom of the immersion shell, and a transducer is fixedly installed on the ultrasonic generator.

9. The device for blackening the surface of a metal part according to claim 1, characterized in that: A second liquid pump is fixedly installed at the bottom of the immersion shell, the liquid inlet end of the second liquid pump is fixedly connected to a filter, a third connecting pipe is fixedly connected between the filter and the immersion shell, and a fourth connecting pipe is fixedly connected between the liquid outlet end of the second liquid pump and the immersion shell.

10. The device for blackening the surface of a metal part according to claim 1, characterized in that: Both sides of the top of the soaking shell are fixedly connected with pull rings, and the sides of the pull rings are provided with arc surfaces.

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