Three-stage connecting rod joint surface ion nitriding device

Abstract

The application relates to a three-section connecting rod joint surface ion nitriding device, which comprises a nitriding assembly, an assembling assembly and a rotary driving assembly. The rotary driving assembly is used for contactless driving rotation of a rotary seat, and is used as a contactless driving source through the suction and release of an electromagnet. The nitriding assembly inside the connecting rod can rotate through a transmission structure. The ion nitriding device is provided with a rotary base, so that the middle section of the connecting rod can rotate in a furnace cover. The problem of temperature non-uniformity and non-uniform nitriding caused by the distance difference between the cathode and the anode is reduced. The electromagnet drives the screw cylinder to reciprocate up and down on the basis of not damaging the sealing property of the furnace cover. The screw cylinder drives the driving rod to reciprocate, and the one-way driving structure drives the gear disc to rotate. The device is completely and continuously driven in a sealed and high-temperature environment.

Description

Technical Field

[0001] This invention belongs to the field of connecting rod ion nitriding technology, specifically relating to an ion nitriding device for a three-section connecting rod joint surface. Background Technology

[0002] When machining the connecting rod on the engine crankshaft, its surface needs to be ion nitrided to increase its wear resistance. The three-section connecting rod is divided into a connecting rod body, a connecting rod middle section, and a connecting rod lower section. The connecting rod middle section has four internal holes on both sides of the connecting surface for connection, which need to be sealed during ion nitriding.

[0003] When performing ion nitriding on the connecting rod mid-section, a common method is to seal the inner hole of the connecting rod mid-section with a high-temperature resistant plug, and then assemble the connecting rod mid-section onto the cathode plate of the ion nitriding furnace. The furnace shroud acts as the anode for discharge, and the connecting rod mid-section acts as the cathode for glow discharge. The glow discharge process also heats the connecting rod mid-section, but the amount of heat energy obtained by the connecting rod mid-section is related to the distance between the anode and cathode. Different distances between the anode and cathode result in different current densities on the surface of the connecting rod mid-section, causing uneven local temperature, which can easily lead to deformation of the connecting rod mid-section and uneven nitriding. Summary of the Invention

[0004] The purpose of this invention is to provide an ion nitriding device for a three-section connecting rod joint surface in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] An ion nitriding device for a three-section connecting rod interface, comprising:

[0007] The nitriding assembly includes a base, a cathode plate disposed on the base, and a furnace shroud serving as the anode;

[0008] The assembly assembly, used to fix the middle section of the connecting rod, includes several rotating seats rotatably mounted on the cathode plate and gears coaxially mounted below the rotating seats;

[0009] A rotary drive assembly for driving a rotating base to rotate includes a geared disc meshing with a gear. The geared disc is driven to rotate by a drive rod, and the drive rod and the geared disc can only drive in one direction. A protruding cylinder is provided above the furnace hood. The bottom of the protruding cylinder is connected to the furnace hood, and the upper part protrudes outward through the furnace hood. An insulating heat-insulating block is slidably arranged inside the protruding cylinder. A threaded cylinder for driving the drive rod to rotate is provided at the lower end of the insulating heat-insulating block. An iron block is provided at the upper end of the insulating heat-insulating block. An electromagnet for attracting the iron block through the protruding cylinder is provided at the upper end of the furnace hood.

[0010] As a further optimization of the present invention, the nitriding assembly further includes a thermocouple sensor disposed on the cathode plate, a cooling interface disposed on the surface of the furnace shroud, a vacuum interface, and a gas source interface. This solution is the prior art of ion nitriding assemblies. The thermocouple sensor is used to detect temperature, the furnace shroud has a cooling jacket, and a cooling medium is introduced through the cooling interface for cooling and temperature control. The vacuum interface is used to extract air to make the inside of the furnace shroud a vacuum state, and the gas source interface is used to introduce ammonia gas.

[0011] As a further optimization of the present invention, the assembly includes two pairs of vertical rods, one pair of which is fixedly connected to the rotating seat, and the other pair is slidably connected to the rotating seat via a sliding plate. Both pairs of vertical rods have conical plugs on their side surfaces. The conical plugs are used to seal the inner hole of the connecting rod middle section and support the connecting rod middle section. The connecting rod middle section is fixed by the structure in this solution. In order to fully expose the surface of the connecting rod middle section and to seal the inner hole without requiring ion nitriding treatment, conical plugs are used to satisfy the functions of sealing the inner hole and supporting the connecting rod middle section.

[0012] As a further optimization of the present invention, each pair of vertical rods is reinforced by a connecting piece, and the connecting pieces of the two pairs of vertical rods are fixed by fasteners. The fasteners are used to fasten a pair of vertical rods set on the sliding plate. The sliding plate is slid by the fasteners, and a pair of vertical rods on the sliding plate move closer to another pair of vertical rods, so that the conical plug enters the inner hole of the middle section of the connecting rod and is pressed.

[0013] As a further optimization of the present invention, the surface of the conical plug is provided with an elastic strip. The elastic strip has a horizontal V-shaped structure, and both ends of the strip are connected to the conical plug to temporarily support the middle section of the connecting rod. In order to improve assembly efficiency, each vertical rod has multiple assembly stations. For batch assembly, the elastic strip is used for temporary support. After all the middle sections of the connecting rod are assembled, the two vertical rods are brought close together to clamp the middle sections of the connecting rod. It should be noted that if the elastic element is subjected to force at high temperature, it is easy to undergo plastic deformation and lose its elasticity. Therefore, the elastic element is not subjected to force when it is at high temperature, and it only provides temporary support when assembling the middle section of the connecting rod.

[0014] As a further optimization of the present invention, the gear disk has a central hole, and triangular drive teeth are provided on the side wall of the central hole. The drive rod passes through the central hole, and the side wall of the drive rod is provided with a downwardly inclined hinge rod. One side of the contact surface between the hinge rod and the triangular drive teeth is provided with an inclined surface. The drive rod can only reciprocate. In order to make it drive the rotating seat to rotate continuously, a ratchet structure is required between the drive rod and the gear disk to facilitate unidirectional drive. However, conventional ratchet structures use elastic elements to reset the pawl. Since the highest temperature in the furnace can reach 520°C, the elastic element will undergo plastic deformation under continuous force, resulting in the loss of elasticity. Therefore, this solution uses its own weight to reset the pawl, which avoids the use of elastic elements.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention, by setting a rotating base, allows the middle section of the connecting rod to rotate inside the furnace hood, reducing the problems of uneven temperature and uneven nitriding caused by the difference in distance between the anode and cathode. Furthermore, by using an electromagnet to drive the threaded cylinder to move up and down reciprocally without compromising the sealing of the furnace hood, the threaded cylinder drives the drive rod to rotate reciprocally, and further, by using a unidirectional drive structure to drive the gear disc to rotate, it can achieve completely continuous drive in a sealed, high-temperature environment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a top view of the cathode disk of the present invention;

[0019] Figure 3 This is the invention Figure 1 Enlarged view of the structure of section A in the middle;

[0020] Figure 4 This is the invention Figure 1 Enlarged view of the structure of section B;

[0021] Figure 5 This is a top view of the assembly component of the present invention;

[0022] Figure 6 This is the present invention. Figure 4 C-C view;

[0023] Figure 7 This is a side view of the tapered plug and elastic strip of the present invention;

[0024] In the diagram: 1. Nitriding assembly; 11. Base; 12. Furnace hood; 13. Vacuum interface; 14. Gas source interface; 15. Cooling interface; 16. Cathode plate; 17. Thermocouple sensor; 2. Assembly assembly; 21. Rotary seat; 22. Sliding plate; 23. Vertical rod; 24. Conical plug; 25. Elastic strip; 26. Connecting piece; 27. Fastener; 28. Gear; 3. Rotary drive assembly; 31. Gear disc; 32. Drive rod; 33. Threaded cylinder; 34. Insulating heat insulation block; 35. Protruding cylinder; 36. Electromagnet; 37. Iron block; 38. Hinge rod; 39. Inclined surface; 310. Triangular drive tooth; 4. Connecting rod middle section. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] Example 1

[0027] like Figure 1-7 As shown, an ion nitriding device for a three-section connecting rod joint surface includes...

[0028] The nitriding assembly 1 includes a base 11, a cathode plate 16 disposed on the base 11, and a furnace shroud 12 serving as the anode;

[0029] Assembly component 2, which is used to fix the middle section 4 of the connecting rod, includes a plurality of rotating seats 21 rotatably disposed on the cathode plate 16 and a gear 28 coaxially disposed below the rotating seats 21;

[0030] The rotary drive assembly 3, which drives the rotary seat 21 to rotate, includes a gear disk 31 that meshes with a gear 28. The gear disk 31 is driven to rotate by a drive rod 32, and the drive rod 32 and the gear disk 31 can only drive in one direction. A protruding cylinder 35 is provided above the furnace cover 12. The bottom of the protruding cylinder 35 is connected to the furnace cover 12, and the upper part protrudes outward through the furnace cover 12. An insulating heat insulation block 34 is slidably provided inside the protruding cylinder 35. A threaded cylinder 33 for driving the drive rod 32 to rotate is provided at the lower end of the insulating heat insulation block 34. An iron block 37 is provided at the upper end of the insulating heat insulation block 34. An electromagnet 36 for attracting the iron block 37 through the protruding cylinder 35 is provided at the upper end of the furnace cover 12.

[0031] By setting a rotating base, the connecting rod middle section 4 can rotate inside the furnace shroud 12, reducing the problem of uneven temperature and uneven nitriding caused by the difference in distance between the anode and cathode. In the ion nitriding process, in order not to affect the shape of the connecting rod middle section 4, the cooling system of the furnace shroud 12 ensures that the reading of the thermocouple sensor 17 does not exceed 520°C, and the furnace shroud 12 is in a near-vacuum state. At this temperature, the rotary drive assembly 3 cannot use elastic elements and drive elements. Connecting the drive device from the outside would damage the sealing of the furnace shroud 12. Therefore, the electromagnet 36 drives the threaded cylinder 33 to move up and down reciprocally without damaging the sealing of the furnace shroud 12, and the threaded cylinder 33 drives the drive rod 32 to rotate reciprocally. Furthermore, the unidirectional drive structure drives the gear disk 31 to rotate. Since the high temperature affects the magnetic attraction of the iron block 37, the iron block 37 is isolated from the threaded cylinder 33 by the insulating heat block 34.

[0032] The nitriding assembly 1 also includes a thermocouple sensor 17 disposed on the cathode plate 16, a cooling interface 15 disposed on the surface of the furnace shroud 12, a vacuum interface 13 and a gas source interface 14. This solution is the prior art of ion nitriding assemblies. The thermocouple sensor is used to detect temperature. The furnace shroud has a cooling jacket. Cooling medium is introduced through the cooling interface to cool and control the temperature. The vacuum interface is used to extract air to make the inside of the furnace shroud a vacuum state. The gas source interface is used to introduce ammonia gas.

[0033] Assembly component 2 includes two pairs of vertical rods 23. One pair of vertical rods 23 is fixedly connected to the rotating seat 21, and the other pair is slidably connected to the rotating seat 21 via a sliding plate 22. Both pairs of vertical rods 23 have conical plugs 24 on their side surfaces. The conical plugs 24 are used to seal the inner hole of the connecting rod middle section 4 and support the connecting rod middle section 4. The connecting rod middle section 4 is fixed by the structure in this solution. In order to fully expose the surface of the connecting rod middle section 4 and to seal the inner hole that does not require ion nitriding treatment, the conical plugs 24 are used to simultaneously satisfy the functions of sealing the inner hole and supporting the connecting rod middle section 4.

[0034] Each pair of vertical rods 23 is reinforced by a connecting piece 26. The connecting pieces 26 of the two pairs of vertical rods 23 are fixed together by a fastener 27. The fastener 27 is used to fasten a pair of vertical rods 23 set on the sliding plate 22. The sliding plate 22 is slid by the fastener 27, and the pair of vertical rods 23 on the sliding plate 22 moves closer to the other pair of vertical rods 23, so that the conical plug 24 enters the inner hole of the middle section 4 of the connecting rod and is pressed.

[0035] The surface of the conical plug 24 is provided with an elastic strip 25. The elastic strip 25 has a horizontal V-shaped structure, and both ends of it are connected to the conical plug 24 to temporarily support the middle section 4 of the connecting rod. In order to improve assembly efficiency, each vertical rod 23 has multiple assembly stations. For batch assembly, the elastic strip 25 is used for temporary support. After all the middle sections 4 of the connecting rod are assembled, the two vertical rods 23 are brought together to clamp the middle sections 4 of the connecting rod. It should be noted that if the elastic element is subjected to force at high temperature, it is easy to undergo plastic deformation and lose its elasticity. Here, the elastic strip 25 will not be subjected to force when it is in a high temperature state. It only provides temporary support when assembling the middle section 4 of the connecting rod, at which time the temperature is room temperature.

[0036] The gear disk 31 has a central hole, and triangular drive teeth 310 are provided on the side wall of the central hole. The drive rod 32 passes through the central hole, and the side wall of the drive rod 32 is provided with a downwardly inclined hinge rod 38. One side of the contact surface between the hinge rod 38 and the triangular drive teeth 310 is provided with an inclined surface 39. The drive rod 32 can only rotate reciprocally. In order to make it drive the rotating seat 21 to rotate continuously in the same direction, a ratchet structure is required between the drive rod 32 and the gear disk 31 for unidirectional drive. However, conventional ratchet structures use elastic elements to reset the pawl. Since the temperature inside the furnace can reach 520℃, the elastic element will undergo plastic deformation under continuous force and eventually lose its elasticity. Therefore, this solution uses its own weight to reset the pawl, which avoids the use of elastic elements. Specifically, as shown in the figure... Figure 4 and Figure 6 As shown, when the drive rod 32 rotates, when the inclined surface 39 contacts the inclined side of the triangular drive tooth 310, the hinge rod 38 is lifted. When the drive rod 32 rotates in the opposite direction, the straight side of the hinge rod 38 contacts the straight side of the triangular drive tooth 310, thereby driving the toothed disc 31 to rotate.

[0037] The specific implementation method is as follows: the furnace cover 12 is lifted, the middle sections 4 of each connecting rod are installed on the assembly assembly 2, the furnace cover 12 is then closed and fixed, the vacuum degree inside the furnace cover 12 is made to meet the requirements through the vacuum interface 13 and the external vacuum device, then the anode and cathode are connected and ammonia gas is introduced, and at the same time the cooling device in the interlayer of the furnace cover 12 is operated to control the temperature inside the furnace cover 12 and make it reach equilibrium. The electromagnet 36 is intermittently energized to make the iron block 37 move up and down, thereby driving the drive rod 32 to rotate back and forth, so that the rotating seat 21 rotates continuously in the same direction, thereby reducing the problem of uneven temperature and uneven nitriding caused by different distances between the anode and cathode.

[0038] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An ion nitriding device for a three-section connecting rod joint surface, characterized in that: include The nitriding assembly (1) includes a base (11), a cathode plate (16) disposed on the base (11), and a furnace shroud (12) serving as the anode. Assembly component (2), which is used to fix the middle section of the connecting rod (4), includes several rotating seats (21) rotatably disposed on the cathode plate (16) and a gear (28) coaxially disposed below the rotating seats (21). A rotary drive assembly (3) is used to drive the rotary seat (21) to rotate. It includes a gear disk (31) that meshes with a gear (28). The gear disk (31) is driven to rotate by a drive rod (32). The drive rod (32) and the gear disk (31) can only drive in one direction. A protruding cylinder (35) is provided above the furnace cover (12). The bottom of the protruding cylinder (35) is connected to the furnace cover (12). The upper part protrudes outward through the furnace cover (12). An insulating heat insulation block (34) is slidably provided inside the protruding cylinder (35). A threaded cylinder (33) for driving the drive rod (32) to rotate is provided at the lower end of the insulating heat insulation block (34). An iron block (37) is provided at the upper end of the insulating heat insulation block (34). An electromagnet (36) for attracting the iron block (37) through the protruding cylinder (35) is provided at the upper end of the furnace cover (12). The gear disk (31) has a central hole, and a triangular drive tooth (310) is provided on the side wall of the central hole. The drive rod (32) passes through the central hole, and a downwardly inclined hinge rod (38) is provided on the side wall of the drive rod (32). A slope (39) is provided on one side of the contact surface between the hinge rod (38) and the triangular drive tooth (310).

2. The ion nitriding device for a three-section connecting rod joint surface according to claim 1, characterized in that: The nitriding assembly (1) also includes a thermocouple sensor (17) disposed on the cathode plate (16), a cooling interface (15) disposed on the surface of the furnace shroud (12), a vacuum interface (13) and a gas source interface (14).

3. The ion nitriding device for a three-section connecting rod joint surface according to claim 1, characterized in that: The assembly component (2) includes two pairs of vertical rods (23), one pair of vertical rods (23) is fixedly connected to the rotating seat (21), and the other pair is slidably connected to the rotating seat (21) through a sliding plate (22). Both pairs of vertical rods (23) are provided with conical plugs (24) on their side surfaces. The conical plugs (24) are used to close the inner hole of the middle section (4) of the connecting rod and support the middle section (4) of the connecting rod.

4. The ion nitriding device for a three-section connecting rod joint surface according to claim 3, characterized in that: Each pair of vertical rods (23) is reinforced by a connecting piece (26), and the connecting pieces (26) of the two pairs of vertical rods (23) are fixed together by a fastener (27). The fastener (27) is used to fasten a pair of vertical rods (23) set on the sliding plate (22).

5. The ion nitriding device for a three-section connecting rod joint surface according to claim 4, characterized in that: The surface of the conical plug (24) is provided with an elastic strip (25), which has a horizontal V-shaped structure and is connected to the conical plug (24) at both ends for temporarily supporting the middle section (4) of the connecting rod.

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