Workpiece preheating device for QPQ process

Abstract

The utility model belongs to the technical field of workpiece preheating, and discloses a workpiece preheating device for a QPQ (Quench-Polish-Quench) process, which comprises a preheating furnace, the top of the preheating furnace is provided with an opening, and the opening is rotatably connected with two closing plates; the lifting assembly is arranged above the preheating furnace, and the output end of the lifting assembly is detachably connected with the material frame; the control mechanism is arranged on one side of the preheating furnace; wherein the hoisting assembly is used for driving the material frame to translate or lift, the control mechanism is used for controlling the two closing plates to be close to or far away from each other, the problems that energy consumption is increased, energy is wasted and even the preheating effect is affected due to the fact that the top of a preheating furnace of an existing preheating device is open are solved, and the preheating device is suitable for workpiece preheating.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece preheating, and more specifically, to a workpiece preheating device used in a QPQ process. Background Art

[0002] QPQ is the abbreviation of Quench-Polish-Quench, which literally means quenching-polishing-quenching. This process involves placing ferrous metal parts in two salt baths of different properties, and infiltrating multiple elements into the metal surface to form a composite infiltration layer, thereby achieving the purpose of surface modification of the parts. It does not undergo quenching, but achieves the effect of surface quenching, so it is called "nitrogen-carbon-oxygen composite treatment technology" in China.

[0003] Before QPQ process, the workpiece needs to be cleaned and then preheated. The purpose of preheating is twofold: 1. Dry the residual moisture on the surface of the workpiece; 2. Prevent the cold workpiece from directly entering the nitriding furnace, which will lower the temperature in the furnace and affect the nitriding effect.

[0004] The existing preheating method usually uses a lifting device to send the workpiece into a preheating furnace for preheating. In order to facilitate the lifting of the workpiece, the top of the preheating furnace is usually set to be open. This not only increases energy consumption and wastes energy, but also affects the precise control of temperature, resulting in poor preheating effect. Utility Model Content

[0005] The utility model aims to provide a workpiece preheating device for QPQ process, which solves the problem that the existing preheating device increases energy consumption, wastes energy and even affects the preheating effect due to the open top setting of the preheating furnace.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: a workpiece preheating device for QPQ process, including a preheating furnace, which is open at the top, and two closing plates are rotatably connected to the opening; a lifting assembly, which is arranged above the preheating furnace, and the output end of the lifting assembly is detachably connected to the material frame; a control mechanism, which is arranged on one side of the preheating furnace; wherein the lifting assembly is used to drive the material frame to translate or lift, and the control mechanism is used to control the two closing plates to move closer to or farther away from each other.

[0007] The working principle of this technical solution is as follows: when in use, first place the workpiece to be preheated in the material frame, then start the lifting assembly to lift the material frame above the preheating furnace, then adjust the control mechanism so that the two closing plates move away from each other to open the preheating furnace, then control the lifting assembly to lower the material frame into the preheating furnace for preheating, and finally adjust the control mechanism so that the two closing plates move closer to each other until the opening of the preheating furnace is closed.

[0008] In summary, the utility model has the following beneficial effects:

[0009] Compared with the prior art, the utility model discloses a workpiece preheating device for QPQ process, which realizes the opening and closing control of the preheating furnace opening by setting a closing plate, a lifting assembly and a control mechanism to cooperate with each other, so as to prevent the top of the preheating furnace from being always open, which will increase energy consumption, waste energy and even affect the preheating effect of the workpiece.

[0010] Furthermore, the lifting assembly includes a support frame fixedly arranged on both sides of the preheating furnace, an electric hoist is installed on the top of the support frame, and the bottom of the electric hoist is connected to the material frame through a lifting rope.

[0011] Furthermore, the control mechanism includes two connecting plates and a mounting block, wherein the two connecting plates are fixedly connected to the two closing plates respectively, the mounting block is fixedly arranged on one side of the preheating furnace, the two connecting plates are rotatably connected to the mounting block through a rotating shaft, and a torsion spring is installed at the rotating shaft, the two connecting plates force the two closing plates to be close to each other under the action of the torsion spring, and an interference component for separating the two closing plates is arranged on the inner side of the mounting block.

[0012] Furthermore, the interference assembly includes a "triangular pyramid" wedge block movably arranged between two connecting plates, and the two side surfaces of the wedge block are respectively slidably abutted against the two connecting plates, and a threaded rod is fixedly connected to the bottom of the wedge block, and the threaded rod downwardly penetrates the mounting block and is threadedly sleeved with a threaded sleeve, and the top of the threaded sleeve is rotatably connected to the mounting block, and a worm gear is fixedly sleeved on the surface of the threaded sleeve, and a mounting plate is fixedly connected to the bottom of the mounting block, and a motor is fixedly connected to the mounting plate, and the output end of the motor penetrates the mounting plate and is fixedly connected with a worm meshing with the worm gear, and a chamber is opened on the inner side of the mounting block, and the part of the threaded rod located in the chamber is fixedly sleeved with a slider, and the slider is slidably abutted against the side wall of the chamber.

[0013] Furthermore, a bottom plate is fixedly provided at the bottom of the support frame, and the preheating furnace is placed on the bottom plate.

[0014] Furthermore, the two closing plates are provided with a through hole for the suspension rope to pass through. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the utility model;

[0016] Figure 2 for Figure 1 Magnified view at A in the middle;

[0017] Figure 3 This is a schematic diagram of the structure of the interference assembly of the utility model after removing the mounting plate;

[0018] Figure 4 for Figure 1 The view in the B direction;

[0019] Figure 5 for Figure 4 Enlarged view at center C;

[0020] In the figure: 1. preheating furnace; 2. closing plate; 3. material frame; 4. electric hoist; 5. support frame; 6. bottom plate; 7. mounting block; 8. connecting plate; 9. wedge block; 10. motor; 11. threaded rod; 12. slider; 13. threaded sleeve; 14. worm gear; 15. worm; 16. through hole; 17. rotating shaft. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1 —5 The utility model is further described in detail.

[0022] like Figure 1 As shown, an embodiment of the utility model proposes a workpiece preheating device for the QPQ process, comprising a preheating furnace 1, the top of which is open, and two closing plates 2 are rotatably connected to the opening; a lifting assembly, which is arranged above the preheating furnace 1, and the output end of the lifting assembly is detachably connected to a material frame 3; a control mechanism, which is arranged on one side of the preheating furnace 1; wherein the lifting assembly is used to drive the material frame 3 to translate or lift, and the control mechanism is used to control the two closing plates 2 to move closer to or farther away from each other.

[0023] The specific working process is: first, place the workpiece to be preheated in the material frame 3, then start the lifting assembly to lift the material frame 3 above the preheating furnace 1, then adjust the control mechanism so that the two closing plates 2 move away from each other to open the preheating furnace 1, then control the lifting assembly to lower the material frame 3 into the preheating furnace 1 for preheating, and finally adjust the control mechanism so that the two closing plates 2 move closer to each other until the opening of the preheating furnace 1 is closed.

[0024] In this embodiment, the closing plate 2, the lifting assembly and the control mechanism cooperate with each other to realize the opening and closing control of the opening of the preheating furnace 1, so as to prevent the top from being always open, which will increase energy consumption, waste energy, and even affect the preheating effect of the workpiece.

[0025] During actual use, in order to improve the overall stability of the device, a bottom plate 6 may be fixedly provided at the bottom of the support frame 5 , and the preheating furnace 1 may be placed on the bottom plate 6 .

[0026] like Figure 1 As shown, according to another embodiment of the utility model, a workpiece preheating device for the QPQ process, wherein the lifting assembly includes a support frame 5 fixedly arranged on both sides of the preheating furnace 1, an electric hoist 4 is installed on the top of the support frame 5, and the bottom of the electric hoist 4 is connected to the material frame 3 through a lifting rope.

[0027] In this solution, an electric hoist 4 is provided to pull a suspension rope to control the translation or lifting of the material frame 3 .

[0028] like Figure 1 , Figure 4 and Figure 5 As shown, according to another embodiment of the utility model, a workpiece preheating device for QPQ process, wherein the control mechanism includes two connecting plates 8 and a mounting block 7, wherein the two connecting plates 8 are fixedly connected to the two closing plates 2 respectively, the mounting block 7 is fixedly arranged on one side of the preheating furnace 1, the two connecting plates 8 are rotatably connected to the mounting block 7 through a rotating shaft 17, and a torsion spring is installed at the rotating shaft 17, the two connecting plates 8 force the two closing plates 2 to be close to each other under the action of the torsion spring, and an interference component for separating the two closing plates 2 is arranged on the inner side of the mounting block 7.

[0029] The present scheme is to control the two closing plates 2 to be close to or away from each other by setting the connecting plate 8, the mounting block 7, the torsion spring, the rotating shaft 17 and the interference component to cooperate with each other. Before the preheating work starts, the two connecting plates 8 force the two closing plates 2 to be close to each other under the action of the torsion spring to reduce the heat loss in the preheating furnace 1 and reduce the energy loss. When the workpiece needs to be placed in the preheating furnace 1 for preheating, the interference component is adjusted to make the two closing plates 2 move away from each other to open the opening of the preheating furnace 1. After the material frame 3 enters the preheating furnace 1, the interference component is adjusted again, and the two closing plates 2 will close the preheating furnace 1 again under the joint action of the interference component and the torsion spring until the preheating is completed.

[0030] In actual use, in order to make the closing plates 2 close better, a through hole 16 for the suspension rope to pass through can be provided on both closing plates 2.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, according to another embodiment of the utility model, a workpiece preheating device for QPQ process, wherein the interference assembly includes a "triangular pyramid" wedge block 9 movably arranged between two connecting plates 8, and the two side surfaces of the wedge block 9 are respectively slidably abutted against the two connecting plates 8, and the bottom of the wedge block 9 is fixedly connected with a threaded rod 11, and the threaded rod 11 downwardly penetrates the mounting block 7 and is threadedly sleeved with a threaded sleeve 13, and the top of the threaded sleeve 13 is rotatably connected to the mounting block 7, and the surface of the threaded sleeve 13 is fixedly sleeved with a worm gear 14, and the bottom of the mounting block 7 is fixedly connected with a mounting plate, and a motor 10 is fixedly connected to the mounting plate, and the output end of the motor 10 penetrates the mounting plate and is fixedly connected with a worm 15 meshing with the worm gear 14, and a chamber is opened on the inner side of the mounting block 7, and the part of the threaded rod 11 located in the chamber is fixedly sleeved with a slider 12, and the slider 12 is slidably abutted against the side wall of the chamber.

[0032] The present scheme realizes the purpose of controlling the two closing plates 2 to move away from each other by setting the wedge block 9, the threaded sleeve 13, the threaded rod 11, the mounting plate, the slider 12, the worm gear 14, the worm 15 and the motor 10 to cooperate with each other. When in use, the motor 10 is started to drive the worm 15 to rotate, and then the worm gear 14 drives the threaded sleeve 13 to rotate. Since the slider 12 is constrained by the side wall of the chamber and cannot rotate, the threaded rod 11 starts to drive the wedge block 9 to move upward under the action of the thread. As the cross-section of the contact between the wedge block 9 and the two connecting plates 8 gradually increases, the two connecting plates 8 begin to move away from each other, that is, the angle between them gradually increases, so that the two closing plates 2 also move away from each other, thereby achieving the purpose of opening the preheating furnace 1; when the preheating furnace 1 needs to be closed, the driving motor 10 rotates in the opposite direction to make the wedge block 9 descend, and then the two closing plates 2 are close to each other and pressed against each other under the action of the torsion spring, thereby achieving the closure of the preheating furnace 1.

[0033] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A workpiece preheating device for QPQ process, It is characterized in that include: A preheating furnace (1) having an open top, wherein two closing plates (2) are rotatably connected to the open top; A lifting assembly is arranged above the preheating furnace (1), and the output end of the lifting assembly is detachably connected to the material frame (3); A control mechanism, which is arranged on one side of the preheating furnace (1); The lifting assembly is used to drive the material frame (3) to move horizontally or up and down, and the control mechanism is used to control the two closing plates (2) to move closer to or farther away from each other.

2. A workpiece preheating device for a QPQ process as claimed in claim 1, Features: The lifting assembly comprises a support frame (5) fixedly arranged on both sides of the preheating furnace (1), an electric hoist (4) is installed on the top of the support frame (5), and the bottom of the electric hoist (4) is connected to the material frame (3) through a lifting rope.

3. A workpiece preheating device for a QPQ process as claimed in claim 2, Features: The control mechanism comprises two connecting plates (8) and a mounting block (7), wherein the two connecting plates (8) are fixedly connected to the two closing plates (2) respectively, the mounting block (7) is fixedly arranged on one side of the preheating furnace (1), the two connecting plates (8) are rotatably connected to the mounting block (7) via a rotating shaft (17), and a torsion spring is installed at the rotating shaft (17), the two connecting plates (8) force the two closing plates (2) to be in close contact with each other under the action of the torsion spring, and an interference component for separating the two closing plates (2) is arranged on the inner side of the mounting block (7).

4. A workpiece preheating device for a QPQ process as claimed in claim 3, Features: The interference assembly comprises a "triangular pyramid" wedge (9) movably arranged between two connecting plates (8), the two side surfaces of the wedge (9) are respectively in sliding contact with the two connecting plates (8), the bottom of the wedge (9) is fixedly connected with a threaded rod (11), the threaded rod (11) passes through the mounting block (7) downward and is threadedly sleeved with a threaded sleeve (13), the top of the threaded sleeve (13) is rotatably connected to the mounting block (7), the surface of the threaded sleeve (13) is fixedly sleeved with a worm gear (14), the bottom of the mounting block (7) is fixedly connected with a mounting plate, the mounting plate is fixedly connected with a motor (10), the output end of the motor (10) passes through the mounting plate and is fixedly connected with a worm (15) meshing with the worm gear (14), the inner side of the mounting block (7) is provided with a chamber, the part of the threaded rod (11) located in the chamber is fixedly sleeved with a slider (12), and the slider (12) is in sliding contact with the side wall of the chamber.

5. A workpiece preheating device for a QPQ process as claimed in claim 4, Features: A bottom plate (6) is fixedly arranged at the bottom of the support frame (5), and the preheating furnace (1) is placed on the bottom plate (6).

6. A workpiece preheating device for a QPQ process as claimed in claim 5, Features: The two closing plates (2) are provided with a through hole (16) for the suspension rope to pass through.

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