Machining method for plunger of lubricating pump

Abstract

The invention discloses a machining method for a plunger of a lubricating pump. The machining method of the plunger of the lubricating pump comprises the following steps that the plunger is arranged under an electromagnetic coil, a clamping cylinder is started, and the clamping cylinder clamps the lower end of a large-diameter section of the plunger; the driving mechanism is started and drives the clamping cylinder to move upwards, the driving mechanism is closed after the upper end of the small-diameter section of the plunger is magnetically attracted and fixed to the magnet, at the moment, the junction of the large-diameter section and the small-diameter section is located in the connecting ring, and the lower end of the large-diameter section is located in the electromagnetic coil; the clamping cylinder releases the plunger, the driving mechanism is started, the driving mechanism drives the clamping cylinder to move downwards, the driving motor is started, and the driving motor drives the plunger to rotate; a high-frequency low-voltage large-current power supply is started to provide high-frequency low-voltage large current for the electromagnetic coil, and the plunger is inductively heated; and after the magnet is demagnetized at high temperature, the plunger falls into the water tank. The problem that the plunger cannot be normally assembled and applied due to the fact that the junction is melted due to the skin effect and the point effect and the machining shape and size of the plunger are changed is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pump production methods, in particular to a processing method for a lubrication pump plunger. Background Art

[0002] The lubrication pump is the main component of the intelligent centralized lubrication system, which mainly includes an oil tank and a pump head assembly. The pump head assembly is equipped with a drive device, a cam assembly and a plunger assembly used in conjunction with the cam assembly. Each plunger assembly is an independent oil pumping unit, which is connected to the oil pipe to lubricate each lubrication point.

[0003] Each plunger assembly is an independent oil pump unit, which is connected to the oil pipe to lubricate each lubrication point. The plunger assembly includes a plunger housing, and the oil passage of the plunger housing is slidably equipped with a plunger that can suck and push oil when reciprocating. The plunger and the oil passage are slidably sealed. The plunger includes a small diameter section that slides with the oil passage and a large diameter section that cooperates with the cam assembly. When the plunger is used, the core needs to maintain a certain toughness, and the circumferential side of the plunger has a certain hardness. Usually, the processed plunger needs to be quenched.

[0004] At present, there are two main methods for quenching the plunger. One is to use the traditional quenching process, using a heating furnace to heat the entire plunger, thereby increasing the hardness of the circumferential side but reducing the toughness of the core. The other is to use the principle of electromagnetic induction to heat the plunger in the direction of the induction coil, so that a certain thickness of hardened layer is formed on the circumferential side of the plunger under the premise of reducing the toughness of the core of the plunger. However, when the induction coil is used to heat the shaft, the skin effect and the tip effect can easily melt the circumferential side of the large diameter section and the junction of the small diameter section, changing the processing shape and size of the plunger, and causing the plunger to be unable to be assembled normally. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for processing a lubrication pump plunger.

[0006] To achieve the above object, the technical solution of a method for processing a lubrication pump plunger of the present invention is as follows: A processing method for a lubrication pump plunger, the equipment used in the processing method includes a quenching device, the quenching device includes a mounting frame, an electromagnetic coil is arranged on the mounting frame, the electromagnetic coil includes a small diameter coil part, a connecting ring and a large diameter coil part arranged vertically from top to bottom, the small diameter coil part is used to heat the small diameter section of the plunger, the large diameter coil part is used to heat the large diameter section of the plunger, a magnet for fixing the plunger is arranged on the upper side of the electromagnetic coil, a driving motor for driving the magnet to rotate is arranged on the mounting frame, a clamping cylinder is arranged on the lower side of the electromagnetic coil, a driving mechanism for driving the clamping cylinder to move up and down is arranged on the mounting frame, and a water pool is arranged on the lower side of the clamping cylinder; The processing method comprises the following steps: Place the plunger just below the electromagnetic coil, start the clamping cylinder, and the clamping cylinder clamps the lower end of the large diameter section of the plunger; The driving mechanism is started, and the driving mechanism drives the clamping cylinder upward. After the upper end of the small diameter section of the plunger is fixed by magnetic attraction with the magnet, the driving mechanism is closed. At this time, the junction of the large diameter section and the small diameter section is located in the connecting ring. The clamping cylinder is started, the clamping cylinder releases the plunger, the drive motor is started, and the drive motor drives the plunger to rotate; Start the high-frequency, low-voltage, high-current power supply to provide the electromagnetic coil with high-frequency, low-voltage, high-current, and the plunger is inductively heated; After the magnet is demagnetized at high temperature, the plunger falls into the pool.

[0007] Furthermore, the driving mechanism includes a reduction motor, a screw and a movable plate, the screw is rotatably mounted on a mounting frame, the reduction motor is fixedly connected to the mounting frame, the output shaft of the reduction motor is fixedly connected to the screw, the movable plate is provided with a threaded hole matching the screw, and the clamping cylinder is mounted on the movable plate.

[0008] Furthermore, a round rod is provided on the movable plate, a fixed plate matched with the round rod is provided on the clamping cylinder, and a buffer spring is provided between the lower end of the clamping cylinder and the movable plate.

[0009] Furthermore, the mounting frame is provided with a guide rod, and the movable plate is provided with a guide hole matching the guide plate.

[0010] Furthermore, a connecting shaft is rotatably installed on the mounting frame, the output shaft of the driving motor is fixedly connected to the connecting shaft through a coupling, the magnet is fixedly connected in a fixed sleeve, the upper end of the fixed sleeve is fixedly connected to a central shaft, and the upper end of the central shaft is connected to the lower end of the connecting shaft through a quick connector.

[0011] Furthermore, the two clamping arms of the clamping cylinder are both Z-shaped, and the length of the upper horizontal section of the two clamping arms is smaller than the inner diameter of the lower end inner hole of the large diameter coil part, so that the upper horizontal section can enter the inner side of the large diameter coil part.

[0012] Furthermore, arc grooves matching the large diameter section of the plunger are respectively provided on the inner side surfaces of the upper horizontal section of the clamp arm.

[0013] The present invention provides a method for processing a lubrication pump plunger. Compared with the prior art, the method has the following beneficial effects: The electromagnetic coil is in the form of a structure with a large diameter coil part, a small diameter coil part and a connecting ring. When a high frequency, low voltage and large current is passed through both ends of the electromagnetic coil, the current forms a spiral rising current in the large diameter coil part and the small diameter coil part respectively; due to the skin effect of the current, the current direction in the connecting ring is upward along the outer surface of the vertical cross section of the connecting ring; the direction of the magnetic field formed by the current in the connecting ring is perpendicular to the plunger direction of the plunger in the electromagnetic coil. According to the principle of electromagnetic induction, the current in the connecting ring cannot form induction heating at the corresponding position of the plunger and the connecting ring. When the plunger is inductively heated in the electromagnetic coil, the junction of the large diameter section and the small diameter section of the plunger is not inductively heated, and the junction is heated by heat conduction of the large diameter section and the small diameter section. During the induction heating process, the temperature of the junction is lower than the circumferential surface temperature of the large diameter section or the small diameter section; thereby solving the problem that the junction melts due to the skin effect and the tip effect, changes the processing shape and size of the plunger, and makes the plunger unable to be assembled and used normally. The magnet fixes the plunger in the electromagnetic coil, and the driving motor drives the plunger to rotate. On the one hand, the magnet magnetically attracts the plunger, and there is no need to clamp it with a clamping cylinder. The entire plunger can be located in the electromagnetic coil, avoiding the problem that the plunger exposed outside the electromagnetic coil cannot be fully heated and the clamping cylinder causes the heated plunger to clamp and deform. On the other hand, the plunger is heated more evenly during the rotation process, and the heated plunger can automatically fall into the pool due to high temperature demagnetization of the magnet, simplifying the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a flow chart of a method for processing a lubrication pump plunger of the present invention; Figure 2 It is a structural schematic diagram of a quenching device in a processing method of a lubrication pump plunger of the present invention; Figure 3 It is a partial structural schematic diagram of a quenching device in a processing method of a lubrication pump plunger of the present invention; Figure 4 It is a structural schematic diagram of a quenching device and a plunger in a processing method of a lubrication pump plunger of the present invention; Figure 5 It is a schematic diagram of the use state of the quenching device in the processing method of the lubrication pump plunger of the present invention; Numbers in the figure: 1. Mounting frame; 2. Small diameter coil part; 3. Connecting ring; 4. Large diameter coil part; 5. Driving motor; 6. Connecting shaft; 7. Fixed sleeve; 8. Center shaft; 9. Magnet; 10. Moving plate; 11. Screw rod; 12. Reducer motor; 13. Clamping cylinder; 14. Clamping arm; 15. Arc groove; 16. Fixed plate; 17. Round rod; 18. Buffer spring; 19. Guide rod; 20. Water tank; 21. Plunger. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-Figure 5 As shown, the equipment used in the processing method of the lubrication pump plunger of the present invention includes a quenching device. First, the structure of the quenching device is introduced.

[0016] The quenching device includes a mounting frame 1, and an electromagnetic coil is provided on one side of the mounting frame 1. The inlet and outlet ends of the electromagnetic coil are fixedly connected to the mounting frame 1 through insulating rods, and the inlet and outlet ends of the electromagnetic coil are respectively connected to a high-frequency, low-voltage, and high-current power supply. The electromagnetic coil includes a small-diameter coil portion 2, a connecting ring 3, and a large-diameter coil portion 4 arranged from top to bottom. The lower end of the small-diameter coil portion 2 is fixedly connected to the upper end of the connecting ring 3, and the upper end of the large-diameter coil portion 4 is fixedly connected to the lower end of the connecting ring 3. The connecting ring 3 is a conical structure with a small upper portion and a large lower portion, and the small-diameter coil portion 2 is also a conical structure with a small upper portion and a large lower portion, and the large-diameter coil portion 4 is a conical structure with a large upper portion and a small lower portion. Since the outer diameter of the upper end of the connecting ring 3 is smaller than the outer diameter of the lower end, the outer diameter of the lower end of the small-diameter coil portion 2 is smaller than the outer diameter of the upper end of the large-diameter coil portion 4.

[0017] The upper side of the mounting frame 1 is fixedly connected with a motor fixing seat coaxial with the electromagnetic coil, and the upper side of the motor fixing seat is fixedly connected with a driving motor 5. A connecting shaft 6 is rotatably installed on the mounting frame 1. The connecting shaft 6 is coaxially arranged with the motor fixing seat, and the upper end of the connecting shaft 6 extends into the motor fixing seat. The upper end of the connecting shaft 6 is fixedly connected with the output shaft of the driving motor 5 through a coupling. The lower side of the connecting shaft 6 has a magnet 9 coaxial with the electromagnetic coil. The magnet 9 is circular and is located on the upper side of the electromagnetic coil. The magnet 9 is fixedly connected in the fixing member. In this embodiment, the fixing member is a fixing sleeve 7 with an opening at the lower end, and the magnet 9 is installed in the fixing sleeve 7. The upper end of the fixing sleeve 7 is coaxially fixedly connected with a central shaft 8, and the upper end of the central shaft 8 is fixedly connected with the lower end of the connecting shaft 6 through a quick connector, thereby realizing the quick installation and disassembly of the connecting shaft 6 and the central shaft 8.

[0018] The lower side of the electromagnetic coil is provided with a clamping cylinder 13, and the mounting frame 1 is provided with a driving mechanism for driving the clamping cylinder 13 to move up and down. The driving mechanism includes a reduction motor 12, a screw rod 12 and a moving plate 10, and the upper and lower ends of the screw rod 12 are respectively rotatably mounted on the mounting frame 1 through bearings, and the screw rod 12 is arranged vertically. The reduction motor 12 is fixedly connected to the mounting frame 1 through a motor fixing seat, and the upper end of the screw rod 12 extends into the motor fixing seat, and the upper end of the screw rod 12 is fixedly connected to the output shaft of the reduction motor 12 through a coupling. The moving plate 10 is rectangular, and one end of the moving plate 10 has a threaded hole matching the screw rod 12, so that the moving plate 10 is threadedly connected to the screw rod 12. A vertically extending guide rod 19 is fixedly connected to the mounting frame 1, and the guide rod 19 is located at the other end of the moving plate 10, and the moving plate 10 has a guide hole matching the guide rod 19, so that the moving plate 10 and the guide rod 19 are guided and matched. The reduction motor 12 is started, the reduction motor 12 drives the screw rod 12 to rotate, and the screw rod 12 drives the moving plate 10 to move up and down.

[0019] The screw rod 12 is connected to a clamping cylinder 13. Specifically, a fixing plate 16 is fixedly connected to both sides of the clamping cylinder 13. Two round rods 17 are fixedly connected to the upper side of the movable plate 10. The two fixing plates 16 have round holes matching the round rods 17, so that the two fixing plates 16 are guided and installed on the two round rods 17. The upper ends of the two round rods 17 are fixedly connected to circular rings to prevent the fixing plates 16 from falling off from the upper ends of the round rods 17. A buffer spring 18 is provided between the lower side of the clamping cylinder 13 and the upper side of the movable plate 10. The upper and lower ends of the buffer spring 18 are fixedly connected to the clamping cylinder 13 and the movable plate 10, respectively.

[0020] The two clamping arms 14 of the clamping cylinder 13 are both Z-shaped, and the length of the upper horizontal section of the two clamping arms 14 is less than the inner diameter of the inner hole at the lower end of the large-diameter coil part 4, so that the upper horizontal section can enter the inner side of the large-diameter coil part 4. The inner side surface of the upper horizontal section of the clamping arm 14 is respectively provided with an arc groove 15 matching the large-diameter section of the plunger. The lower side of the clamping arm 14 has a water pool 20, which is a rectangular pool with an open upper end.

[0021] The processing method of the lubrication pump plunger of the present invention comprises the following steps: Place the plunger 21 to the lower side of the electromagnetic coil, with the large diameter section of the plunger located at the lower side of the small diameter section. Place the large diameter section of the plunger between the two clamping arms 14 of the clamping cylinder 13, and correspond to the arc grooves 15 on the two clamping arms 14. Start the clamping cylinder 13, and the two clamping arms 14 of the clamping cylinder 13 move toward each other to clamp the large diameter section of the plunger between the two clamping arms 14. At this time, the plunger is in a vertical state as a whole.

[0022] Start the reduction motor 12, the reduction motor 12 drives the screw rod 12 to rotate forward, the screw rod 12 drives the moving plate 10 upward, and the clamping cylinder 13 on the moving plate 10 moves upward with the moving plate 10. The clamping cylinder 13 drives the plunger upward, and when the small diameter section of the plunger contacts the magnet 9, it is magnetically fixed by the magnet 9, and the reduction motor 12 is turned off. In this process, the buffer spring 18 buffers the clamping cylinder 13, avoiding the problem of a hard collision between the plunger and the magnet 9 caused by the failure of the reduction motor 12 to stop in time after the plunger contacts the magnet 9. When the upper end of the small diameter section of the plunger is magnetically fixed to the magnet 9, the junction of the large diameter section and the small diameter section is located in the connecting ring 3, and the lower end of the large diameter section is located in the electromagnetic coil.

[0023] The clamping cylinder 13 is started, and the two clamping arms 14 of the clamping cylinder 13 move away from each other, and the two clamping arms 14 are separated from the large diameter section of the plunger. The reduction motor 12 is started, and the reduction motor 12 drives the screw rod 12 to rotate in the opposite direction, and the screw rod 12 drives the moving plate 10 downward, and the clamping cylinder 13 on the moving plate 10 moves downward with the moving plate 10, so that the clamping arms 14 come out from the inside of the electromagnetic coil. The drive motor 5 is started, and the drive motor 5 drives the magnet 9 and the plunger to rotate.

[0024] The high-frequency, low-voltage, high-current power supply is started to provide the electromagnetic coil with high-frequency, low-voltage, high-current, and the plunger is induction heated; after the magnet 9 is demagnetized at high temperature, the plunger falls into the water pool 20, completing the plunger quenching treatment.

[0025] The electromagnetic coil is in the form of a structure having a large diameter coil part 4, a small diameter coil part 2 and a connecting ring 3. When a high frequency, low voltage and large current is passed through both ends of the electromagnetic coil, the current forms a spiral ascending current in the large diameter coil part 4 and the small diameter coil part 2 respectively; due to the skin effect of the current, the current direction in the connecting ring 3 is upward along the outer surface of the vertical cross section of the connecting ring 3; the direction of the magnetic field formed by the current in the connecting ring 3 is perpendicular to the plunger direction of the plunger in the electromagnetic coil. According to the principle of electromagnetic induction, the current in the connecting ring 3 cannot form induction heating at the corresponding position of the plunger and the connecting ring 3. When the plunger is inductively heated in the electromagnetic coil, the junction between the large diameter section and the small diameter section of the plunger is not inductively heated, and the junction is heated by heat conduction of the large diameter section and the small diameter section. During the induction heating process, the temperature of the junction is lower than the circumferential surface temperature of the large diameter section or the small diameter section; thereby solving the problem that the junction melts due to the skin effect and the tip effect, changes the processing shape and size of the plunger, and makes the plunger unable to be assembled and used normally. The magnet 9 fixes the plunger in the electromagnetic coil, and the driving motor 5 drives the plunger to rotate. On the one hand, the magnet 9 magnetically attracts the plunger, and there is no need to clamp it with the clamping cylinder 13. The entire plunger can be located in the electromagnetic coil, avoiding the problem that the plunger exposed outside the electromagnetic coil cannot be fully heated and the clamping cylinder 13 causes the heated plunger to be clamped and deformed. On the other hand, the plunger is heated more evenly during the rotation process, and the heated plunger can automatically fall into the water pool 20 due to the high temperature demagnetization of the magnet 9, simplifying the operation.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for processing a lubrication pump plunger, characterized in that: The equipment used in the processing method includes a quenching device, the quenching device includes a mounting frame, an electromagnetic coil is arranged on the mounting frame, the electromagnetic coil includes a small diameter coil part, a connecting ring and a large diameter coil part arranged vertically from top to bottom, the small diameter coil part is used to heat the small diameter section of the plunger, the large diameter coil part is used to heat the large diameter section of the plunger, a magnet for fixing the plunger is provided on the upper side of the electromagnetic coil, a driving motor for driving the magnet to rotate is provided on the mounting frame, a clamping cylinder is provided on the lower side of the electromagnetic coil, a driving mechanism for driving the clamping cylinder to move up and down is provided on the mounting frame, and a water pool is provided on the lower side of the clamping cylinder; The processing method comprises the following steps: Place the plunger just below the electromagnetic coil, start the clamping cylinder, and the clamping cylinder clamps the lower end of the large diameter section of the plunger; The driving mechanism is started, and the driving mechanism drives the clamping cylinder upward. After the upper end of the small diameter section of the plunger is fixed by magnetic attraction with the magnet, the driving mechanism is closed. At this time, the junction of the large diameter section and the small diameter section is located in the connecting ring, and the lower end of the large diameter section is located in the electromagnetic coil. The clamping cylinder is started, the clamping cylinder releases the plunger, the driving mechanism is started, the driving mechanism drives the clamping cylinder downward, the driving motor is started, and the driving motor drives the plunger to rotate; Start the high-frequency, low-voltage, high-current power supply to provide the electromagnetic coil with high-frequency, low-voltage, high-current, and the plunger is inductively heated; After the magnet is demagnetized at high temperature, the plunger falls into the pool.

2. A method for processing a lubrication pump plunger according to claim 1, characterized in that: The driving mechanism includes a reduction motor, a screw and a moving plate. The screw is rotatably mounted on a mounting frame, the reduction motor is fixedly connected to the mounting frame, the output shaft of the reduction motor is fixedly connected to the screw, a threaded hole matching the screw is provided on the moving plate, and the clamping cylinder is mounted on the moving plate.

3. A method for processing a lubrication pump plunger according to claim 2, characterized in that: The movable plate is provided with a round rod, the clamping cylinder is provided with a fixed plate matched with the round rod, and a buffer spring is provided between the lower end of the clamping cylinder and the movable plate.

4. A method for processing a lubrication pump plunger according to claim 2, characterized in that: The mounting frame is provided with a guide rod, and the movable plate is provided with a guide hole matching the guide plate.

5. The method for processing a lubrication pump plunger according to claim 1, characterized in that: A connecting shaft is rotatably mounted on the mounting frame, the output shaft of the driving motor is fixedly connected to the connecting shaft via a coupling, the magnet is fixedly connected in a fixing sleeve, the upper end of the fixing sleeve is fixedly connected to a central shaft, and the upper end of the central shaft is connected to the lower end of the connecting shaft via a quick connector.

6. The method for processing a lubrication pump plunger according to claim 1, characterized in that: The two clamping arms of the clamping cylinder are both Z-shaped, and the length of the upper horizontal section of the two clamping arms is smaller than the inner diameter of the lower end inner hole of the large diameter coil part, so that the upper horizontal section can enter the inner side of the large diameter coil part.

7. A method for processing a lubrication pump plunger according to claim 6, characterized in that: The inner side surfaces of the upper horizontal sections of the clamp arms are respectively provided with arc grooves matching the large diameter sections of the plungers.

Images