Gear shaft carburizing and charging tool

Abstract

The utility model discloses a gear shaft carburizing and charging tool, and relates to the technical field of carburizing tools. The gear shaft clamping device structurally comprises a mounting bottom frame, a mounting upper cover, a lifting ring bolt and a plurality of coaxial gear shaft clamping assemblies which are uniformly distributed in a ring manner and are mounted between the mounting bottom frame and the mounting upper cover; the gear shaft clamping assembly comprises two guide cylindrical rods, a first pointed cone and a gravity positioner; the mounting bottom frame comprises a circular bottom plate; the two guide cylindrical rods and the first pointed cone are vertically installed on the upper surface of the round bottom plate. By adopting a double-pointed-cone coaxial positioning structure and a function of matching self-weight sliding centering of the gravity positioner with jackscrew locking, the tool design aims to realize rapid and accurate clamping of the gear shaft, avoid uneven carburization caused by fixture shielding, ensure consistent carbon concentration gradient on the surface of the gear shaft, improve the thickness and hardness uniformity of a carburized layer, and improve the quality of the carburized layer. And meanwhile, the tool replacement frequency caused by size change is reduced, and the carburizing quality and the production efficiency of the gear shaft are improved.

Description

Technical Field

[0001] This utility model belongs to the field of carburizing tooling technology, and in particular relates to a gear shaft carburizing furnace charging tooling. Background Technology

[0002] Gear shafts are core transmission components in reducers and transmission mechanisms, widely used in various mechanical equipment. Their main functions are to support transmission components, transmit torque, and bear loads. Gear shafts typically consist of a cylindrical surface, shoulders, threads, thread relief grooves, keyways, gears, and center holes at both ends. In the manufacturing process of gear shafts, to obtain the required strength, toughness, and wear resistance, they undergo a series of heat treatment processes, including key steps such as quenching and tempering, hardening, carburizing, and tempering. Carburizing is an important heat treatment process that increases the carbon concentration on the gear shaft surface, forming a carburized layer of a certain thickness, thereby significantly improving the hardness and wear resistance of the gear shaft.

[0003] However, the design of the loading fixture is crucial in the carburizing process of gear shafts. Traditional loading fixtures are often designed for gear shafts of the same size and specification, suitable for installing batches of gear shafts of the same size, and are highly specialized. In addition, traditional fixture designs may require the use of additional clamps to adjust the position of the gear shaft, which is not only cumbersome but also prone to creating clamping points on the circumference of the gear shaft. This can cause the hot airflow to be blocked in this area during carburizing, thus affecting the uniformity of the carburized layer.

[0004] Therefore, there is an urgent need for a new type of gear shaft carburizing furnace charging fixture to solve the problems existing in the current fixture and improve the carburizing quality and production efficiency of the gear shaft. Utility Model Content

[0005] The purpose of this utility model is to provide a gear shaft carburizing furnace loading fixture. By adopting a double-pointed cone coaxial positioning structure and the function of gravity positioner sliding centering combined with set screw locking, the gear shaft can be quickly and accurately clamped, avoiding uneven carburizing caused by fixture obstruction.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a gear shaft carburizing furnace loading fixture, comprising a mounting base, a mounting cover, lifting eye bolts, and a gear shaft clamping assembly with multiple coaxially arranged rings evenly distributed between the mounting base and the mounting cover. The gear shaft clamping assembly includes two guide cylindrical rods, a first cone, and a gravity positioner. The mounting base includes a circular base plate. The two guide cylindrical rods and the first cone are respectively vertically mounted on the upper surface of the circular base plate, and the two guide cylindrical rods are symmetrically arranged about the first cone axis. The gravity positioner is vertically slidably mounted on the two guide cylindrical rods. A second cone is fixed at the bottom center of the gravity positioner. The second cone and the first cone in the same gear shaft clamping assembly are coaxially arranged. The mounting cover is inserted into the mounting base and the guide cylindrical rods, and the lifting eye bolts pass through the mounting cover and are threadedly connected and fixed to the mounting base.

[0008] As a preferred embodiment of this utility model, the circular base plate has several ventilation holes; a cylindrical rod is fixed at the center of the circular base plate; a rectangular slot is provided at the upper end of the cylindrical rod; and a threaded blind hole is provided on the bottom surface of the rectangular slot to engage with the threaded connection of the lifting eye bolt.

[0009] As a preferred embodiment of this utility model, the mounting cover includes a circular plate; a cylindrical head is fixed at the center of the bottom surface of the circular plate; a rectangular plug that mates with the rectangular slot is fixed at the lower end of the cylindrical head; the circular plate, the cylindrical head, and the rectangular plug are provided with through holes that mate with the lifting eye bolt; and a plurality of positioning holes that mate with the guide cylindrical rod are provided on the circular plate.

[0010] As a preferred embodiment of this utility model, four lifting rings are fixed on the upper surface of the circular plate.

[0011] As a preferred embodiment of this utility model, the gravity positioner includes a cylindrical counterweight; a truncated cone is fixed on the lower surface of the cylindrical counterweight; a second pointed cone is fixed on the lower end face of the truncated cone; two vertical plates are axially symmetrically fixed on the circumferential side of the cylindrical counterweight; a sliding sleeve is fixed on the vertical plate and slides linearly with the guide cylindrical rod; a set screw is threaded through the outer wall of the sliding sleeve.

[0012] As a preferred embodiment of this utility model, the upper end of the guide cylindrical rod has a first bevel; the lower end of the positioning hole has a second bevel.

[0013] This utility model has the following beneficial effects:

[0014] This invention employs a double-cone coaxial positioning structure, achieving rapid clamping through direct insertion into the center holes at the upper and lower ends of the gear shaft, eliminating the need for additional clamping adjustments and significantly shortening furnace loading time. The gravity positioner slides along the guide cylindrical rod under its own weight and automatically centers, while the set screw locking function balances clamping speed and positioning stability.

[0015] This utility model features a gear shaft without clamping points on its periphery, avoiding uneven carburizing caused by clamp obstruction, ensuring a consistent carbon concentration gradient on the gear shaft surface, and improving the uniformity of carburized layer thickness and hardness.

[0016] This utility model features a height-adjustable gravity positioner that adapts to gear shafts of different lengths by sliding a cylindrical counterweight on a guide cylindrical rod, reducing the frequency of tooling changes due to dimensional variations. It is also suitable for clamping gear shafts of different types and lengths.

[0017] This invention supports rapid adjustment of clamping spacing through modular components, further expanding the tooling's compatibility with the range of gear shaft diameters.

[0018] This invention adapts to the space of a pit-type carburizing furnace through a compact cylindrical tooling design, reducing the volume of ineffective heating and improving the utilization rate of thermal energy.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the gear shaft carburizing furnace loading tooling of this utility model.

[0022] Figure 2 for Figure 1 The front view.

[0023] Figure 3 A schematic diagram of the structure for installing the base frame, guide cylindrical rod, and first pointed cone.

[0024] Figure 4 A schematic diagram of the structure for installing the top cover.

[0025] Figure 5 A structural diagram showing the installation of the top cover from another perspective.

[0026] Figure 6 This is a schematic diagram of the gravity positioner.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1-Mounting base frame, 11-Round base plate, 12-Ventilation hole, 13-Cylindrical rod, 14-Rectangular slot, 15-Threaded blind hole, 2-Mounting top cover, 21-Round plate, 22-Cylindrical head, 23-Rectangular plug, 24-Round through hole, 25-Positioning socket, 26-Lifting eye, 3-Lifting eye bolt, 4-Guide cylindrical rod, 5-First pointed cone, 6-Gravity positioner, 61-Second pointed cone, 62-Cylindrical counterweight, 63-Frustum, 64-Upright plate, 65-Sliding sleeve, 66-Setting screw. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] Specific Implementation Example 1: Please refer to Figure 1-6 As shown, this utility model is a gear shaft carburizing furnace charging fixture, including a mounting base 1, a mounting cover 2, lifting eye bolts 3, and a gear shaft clamping assembly with multiple coaxial rings evenly distributed and installed between the mounting base 1 and the mounting cover 2.

[0031] The gear shaft clamping assembly includes two guide cylindrical rods 4, a first pointed cone 5, and a gravity positioner 6.

[0032] The mounting base 1 includes a circular base plate 11. Two guide cylindrical rods 4 and a first pointed cone 5 are respectively vertically mounted on the upper surface of the circular base plate 11, and the two guide cylindrical rods 4 are symmetrically arranged about the first pointed cone 5. A gravity positioner 6 is vertically slidably mounted on the two guide cylindrical rods 4. A second pointed cone 61 is fixed at the center of the bottom of the gravity positioner 6. The mounting cover 2 is inserted and mounted on the mounting base 1 and the guide cylindrical rods 4, and the lifting eye bolts 3 pass through the mounting cover 2 and are threadedly connected and fixed to the mounting base 1.

[0033] The lower end of the gear shaft has a central hole at its shaft end, which is mounted on the first pointed cone 5. The second pointed cone 61 on the gravity positioner 6 of the same gear shaft clamping assembly is inserted into the central hole at the upper end of the gear shaft for quick installation and positioning. The gravity positioner 6 is adjustable in position on the two guide cylindrical rods 4. The gear shaft clamping assembly is suitable for quick clamping and installation of gear shafts within a certain length range. The upper and lower ends of the gear shaft are quickly clamped and positioned with the first pointed cone 5 via the second pointed cone 61. There are no clamping points on the circumference of the gear shaft, which facilitates uniform circumferential penetration.

[0034] Taking a pit-type carburizing furnace as an example, in order to force the hot airflow inside the gear shaft carburizing loading fixture to tumble rapidly from the periphery of the fixture during placement, several ventilation holes 12 are provided on the circular base plate 11. These ventilation holes 12 help reduce the airflow turbulence inside the carburizing furnace. A cylindrical rod 13 is fixed at the center of the circular base plate 11. A rectangular slot 14 is provided at the upper end of the cylindrical rod 13. A threaded blind hole 15 is provided on the bottom surface of the rectangular slot 14 to engage with the threaded connection of the lifting eye bolt 3.

[0035] The mounting cover 2 includes a circular plate 21. A cylindrical head 22 is fixed at the center of the bottom surface of the circular plate 21. A rectangular plug 23 that mates with a rectangular slot 14 is fixed at the lower end of the cylindrical head 22. The circular plate 21, the cylindrical head 22, and the rectangular plug 23 have through holes 24 that mate with lifting eye bolts 3. The circular plate 21 has several positioning holes 25 that mate with guide cylindrical rods 4. The mounting cover 2 is inserted and installed on the mounting base 1 and several guide cylindrical rods 4. The overall structure is stable and reliable, and the installation is quick and convenient.

[0036] When the overall weight of the long and short gear shafts in the carburizing furnace charging fixture is relatively heavy, four lifting rings 26 are fixed on the upper surface of the circular plate 21. Increasing the number of hanging and lifting points improves the stability of the lifting process.

[0037] The gravity positioner 6 includes a cylindrical counterweight 62. A frustum 63 is fixed to the lower surface of the cylindrical counterweight 62. A second cone 61 is fixed to the lower end face of the frustum 63. Two vertical plates 64 are axially symmetrically fixed to the circumferential side of the cylindrical counterweight 62. A sliding sleeve 65, which is linearly slidingly engaged with the guide cylindrical rod 4, is fixed on the vertical plate 64. A set screw 66 is threaded through the outer wall of the sliding sleeve 65. The second cone 61 in the same gear shaft clamping assembly is coaxially arranged with the first cone 5. After the gravity positioner 6 clamps and positions the gear shaft, the sliding sleeve 65 can be limited by rotating the hexagonal socket set screw 66, thereby improving the stability of the gear shaft clamping and positioning.

[0038] To facilitate the alignment and installation of the top cover 2 and the guide cylindrical rod 4, a first bevel is made at the upper end of the guide cylindrical rod 4. A second bevel is made at the lower end of the positioning hole 25.

[0039] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A gear shaft carburizing furnace charging fixture, characterized in that: It includes a mounting base (1), a mounting cover (2), lifting eye bolts (3), and a gear shaft clamping assembly with multiple coaxial rings evenly distributed and installed between the mounting base (1) and the mounting cover (2); The gear shaft clamping assembly includes two guide cylindrical rods (4), a first pointed cone (5), and a gravity positioner (6); The mounting base (1) includes a round base plate (11); The two guide cylindrical rods (4) and the first pointed cone (5) are respectively vertically mounted on the upper surface of the circular base plate (11), and the two guide cylindrical rods (4) are symmetrical about the first pointed cone (5); The gravity positioner (6) is vertically slidably mounted on the two guide cylindrical rods (4); a second cone (61) is fixed at the bottom center of the gravity positioner (6); the second cone (61) in the same gear shaft clamping assembly is coaxially arranged with the first cone (5); The mounting cover (2) is inserted into the mounting base (1) and several of the guide cylindrical rods (4), and the lifting eye bolt (3) passes through the mounting cover (2) and is threadedly connected and fixed to the mounting base (1).

2. The gear shaft carburizing furnace charging fixture according to claim 1, characterized in that, The circular base plate (11) has several ventilation holes (12); a cylindrical rod (13) is fixed at the center of the circular base plate (11); a rectangular slot (14) is provided at the upper end of the cylindrical rod (13); and a threaded blind hole (15) is provided on the bottom surface of the rectangular slot (14) to be threadedly connected to the lifting eye bolt (3).

3. The gear shaft carburizing furnace charging fixture according to claim 2, characterized in that, The mounting cover (2) includes a circular plate (21); a cylindrical head (22) is fixed at the center of the bottom surface of the circular plate (21); a rectangular plug (23) that mates with the rectangular slot (14) is fixed at the lower end of the cylindrical head (22); the circular plate (21), the cylindrical head (22) and the rectangular plug (23) are provided with circular through holes (24) that mate with the lifting eye bolt (3); the circular plate (21) is provided with a plurality of positioning insertion holes (25) that mate with the guide cylindrical rod (4).

4. The gear shaft carburizing furnace charging fixture according to claim 3, characterized in that, Four lifting rings (26) are fixed on the upper surface of the circular plate (21).

5. The gear shaft carburizing furnace charging fixture according to claim 1, characterized in that, The gravity positioner (6) includes a cylindrical counterweight (62); a truncated cone (63) is fixed on the lower surface of the cylindrical counterweight (62); the second cone (61) is fixed on the lower end face of the truncated cone (63); two vertical plates (64) are fixed axially symmetrically on the circumferential side of the cylindrical counterweight (62); a sliding sleeve (65) is fixed on the vertical plate (64) and slides linearly with the guide cylindrical rod (4); a set screw (66) is threaded through the outer wall of the sliding sleeve (65).

6. The gear shaft carburizing furnace charging fixture according to claim 3, characterized in that, The guide cylindrical rod (4) has a first bevel at its upper end; the positioning hole (25) has a second bevel at its lower end.

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