Tunnel type continuous heating furnace

Abstract

The utility model belongs to the technical field of tunnel type heating furnaces, and provides a tunnel type continuous heating furnace which comprises a heating tunnel, a rack, a conveying unit and a pre-tightening unit. The conveying unit comprises a chain type mesh belt and a rotating shaft, the rotating shaft is rotatably installed on the rack, rotating gears are coaxially fixed to the two ends of the rotating shaft, and the rotating gears are matched with a chain of the chain type mesh belt; the pre-tightening unit comprises a pre-tightening shaft, a swing rod and a spring, the two ends of the spring are connected with the swing rod and the machine frame respectively, the pre-tightening shaft is rotatably installed on the swing rod, pre-tightening gears are coaxially fixed to the two ends of the pre-tightening shaft, and the pre-tightening gears are matched with a chain of the chain type mesh belt. According to the heating furnace, after the chain type mesh belt is loosened, the spring is shortened, the swing rod is pulled to swing, and meanwhile the pre-tightening shaft is driven to move, so that the tightness of the chain type mesh belt can be automatically adjusted, and the problem that the distance needs to be manually adjusted after the mesh belt is loosened is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel type heating furnaces, and in particular relates to a tunnel type continuous heating furnace. Background Art

[0002] The tunnel heating furnace is a tunnel-type mechanical equipment that dries and heats the workpieces through heat conduction. The workpieces move relative to each other through the chain mesh belt and the electric heating element, thereby completing the drying, heating and conveying tasks. It can produce continuously, save a lot of manpower, and has stable heating quality.

[0003] The existing tunnel heating furnace is usually longer than 6 meters, which is not only inefficient, slow to heat, and has a large energy loss, but also the chain mesh belt is easy to loosen after a period of use, and the spacing needs to be manually adjusted to ensure normal transmission. In addition, the fan of the existing tunnel heating furnace is usually arranged from the side, and the heating efficiency is not high. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a tunnel-type continuous heating furnace, which can automatically adjust the tightness of the chain mesh belt through a pre-tightening unit, effectively solving the problem of manual adjustment of the spacing of the chain mesh belt after it becomes loose.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a tunnel-type continuous heating furnace, comprising a heating tunnel, a frame, a conveying unit, and a pre-tightening unit;

[0006] The conveying unit comprises a chain mesh belt and at least four rotating shafts, wherein the rotating shafts are rotatably mounted on the frame, and rotating gears are coaxially fixed at both ends of the rotating shafts, and the rotating gears cooperate with the chains of the chain mesh belt;

[0007] The pre-tightening unit comprises a pre-tightening shaft, a swinging rod, and a spring. The swinging rod is hinged to the frame. Two ends of the spring are respectively connected to the swinging rod and the frame. The pre-tightening shaft is rotatably mounted on the swinging rod. Pre-tightening gears are coaxially fixed to the two ends of the pre-tightening shaft. The pre-tightening gears cooperate with the chains of the chain-type mesh belt so that the four rotating shafts and the pre-tightening shaft are connected through the chain-type mesh belt transmission.

[0008] The heating tunnel is installed on the frame, and the heating tunnel cover is arranged on the outside of the chain mesh belt.

[0009] Preferably, a heating conveying chamber is provided in the heating tunnel, and a fan is provided at the top of the heating conveying chamber.

[0010] Preferably, the fan is a turbulent flow fan.

[0011] Preferably, a placement groove is provided at the bottom of the heating and conveying chamber, and a heating unit is provided in the placement groove.

[0012] Preferably, a partition is provided at the top of the placement groove.

[0013] Preferably, both the inlet and the outlet of the heating conveying chamber are provided with thermal insulation curtains.

[0014] Preferably, the thermal insulation curtain comprises a plurality of baffles connected in sequence, and two adjacent baffles are hinged.

[0015] Preferably, a motor is mounted on the frame, and a power output end of the motor is coaxially fixed with one of the rotating shafts.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model provides a tunnel-type continuous heating furnace, in which the swing rod is connected to the frame through a spring, and the spring is in a stretched state. When the chain mesh belt is loose, the spring shortens and pulls the swing rod to swing, and at the same time drives the preload shaft to move, so that the tightness of the chain mesh belt can be automatically adjusted, effectively solving the problem of manually adjusting the spacing after the chain mesh belt is loose. The heating furnace is suitable for pre-treatment of hot forging aluminum with a small batch temperature below 400°C, with a length of about 3 meters, and has the characteristics of low cost, high heating efficiency, and suitable for small-sized parts products.

[0018] 2. The utility model provides a tunnel-type continuous heating furnace, which adopts the bottom heating method so that the heating unit can maintain the shortest distance from the workpiece. At the same time, a turbulent fan is arranged at the top of the heating conveying chamber to blow from top to bottom, which can achieve rapid heating and effectively improve the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the side structure of a tunnel-type continuous heating furnace provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the front structure of a preload shaft and related parts of a tunnel-type continuous heating furnace provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the front structure of a tunnel-type continuous heating furnace provided in an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the front structure of a heating tunnel and related parts of a tunnel-type continuous heating furnace provided in an embodiment of the utility model;

[0023] Figure 5A schematic diagram of the front structure of a heat preservation curtain of a tunnel-type continuous heating furnace provided in an embodiment of the utility model;

[0024] Figure 6 A schematic diagram of the front structure of a filter plate of a tunnel-type continuous heating furnace provided in an embodiment of the utility model.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. Heating tunnel; 2. Frame; 3. Rotating shaft; 4. Chain mesh belt; 5. Rotating gear; 6. Preload shaft; 7. Preload gear; 8. Swing rod; 9. Spring; 10. Fan; 11. Placement slot; 12. Heating unit; 13. Partition; 14. Insulation curtain; 15. Heating conveying chamber; 16. Workpiece; 17. Air duct; 18. Exhaust fan; 19. Filter plate; 141. Baffle. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0028] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a tunnel-type continuous heating furnace, including a heating tunnel 1, a frame 2, a conveying unit, and a pre-tightening unit;

[0031] The conveying unit includes a chain mesh belt 4 and four rotating shafts 3. The rotating shafts 3 are rotatably mounted on the frame 2. Rotating gears 5 are coaxially fixed at both ends of the rotating shafts 3. The rotating gears 5 cooperate with the chains of the chain mesh belt 4. Specifically, the chain mesh belt 4 includes a grid-shaped belt and chains on both sides of the grid-shaped belt. The two rotating gears 5 on the rotating shaft 3 cooperate with the two chains of the chain mesh belt 4 respectively, so that when the rotating shaft 3 rotates, the rotating gears 5 can be driven to rotate, and then the chain mesh belt 4 can be driven to transmit.

[0032] The preload unit includes a preload shaft 6, two swing rods 8, and a spring 9. Figure 1As shown, the bottom end of the swing rod 8 is hinged to the frame 2, the spring 9 is located on the right side of the swing rod 8, the two ends of the spring 9 are respectively connected to the swing rod 8 and the frame 2, and the spring 9 is in a stretched state. Figure 2 As shown, a rotating seat is fixed on the swing rod 8, and the two ends of the pre-tightening shaft 6 can be rotatably inserted in the rotating seats of the two swing rods 8, and the two ends of the pre-tightening shaft 6 are coaxially fixed with pre-tightening gears 7, and the two pre-tightening gears 7 are located between the two swing rods 8. The pre-tightening gear 7 cooperates with the chain of the chain-type mesh belt 4, so that the four rotating shafts 3 and the pre-tightening shaft 6 are connected by the chain-type mesh belt 4. For example, the four rotating shafts 3 are respectively located at four corners, the pre-tightening shaft 6 is located between the two rotating shafts 3 on the left, and the pre-tightening shaft 6 is located on the right side of the two rotating shafts 3 on the left, so that the chain-type mesh belt 4 on the left can be in a wavy structure. In other words, the chain-type mesh belt 4 first bypasses the left side of the rotating shaft 3 on the upper left, then bypasses the right side of the pre-tightening shaft 6, and finally bypasses the left side of the rotating shaft 3 on the lower left.

[0033] A motor is also mounted on the frame 2, and the power output end of the motor is coaxially fixed with a rotating shaft 3. The motor drives the rotating shaft 3 to rotate, thereby realizing the conveying function of the chain mesh belt 4, and the transmission speed of the chain mesh belt 4 can be adjusted according to the heating temperature.

[0034] The heating tunnel 1 is installed on the frame 2, and the heating tunnel 1 is covered on the outside of the chain mesh belt 4. The heating tunnel 1 is about 3 meters long, and the heating tunnel 1 can adopt a split structure to facilitate assembly or disassembly and maintenance. The chain mesh belt 4 is used to transport the workpiece 16, and the heating tunnel 1 is used to heat the workpiece 16.

[0035] Based on the above structure, when the chain mesh belt 4 becomes longer and loose, the spring 9 shortens and pulls the top end of the swing rod 8 to swing to the right, so that the pre-tensioning shaft 6 moves away from the two rotating shafts 3 on the left, so that the chain mesh belt 4 can be tightened again without manual adjustment of the spacing.

[0036] In this embodiment, Figure 3 As shown, a heating conveying chamber 15 is provided in the heating tunnel 1, and the chain-type mesh belt 4 can convey a workpiece 16 through the heating conveying chamber 15. A fan 10 is provided on the top of the heating conveying chamber 15. The fan 10 can be a turbulent fan.

[0037] The turbulent fan can blow from top to bottom, effectively improving the heating efficiency.

[0038] In this embodiment, Figure 1 , 3As shown, a placement groove 11 is provided at the bottom of the heating and conveying chamber 15 , and a heating unit 12 is provided in the placement groove 11 .

[0039] The heating and conveying chamber 15 can be divided into a preheating zone, a heating zone, and a heat preservation zone. The heating power of the heating unit 12 in different zones is different, and the length of each zone is also different. Each zone adopts the bottom heating method, so that the heating unit 12 can maintain the shortest distance with the workpiece 16 to achieve rapid heating. A partition 13 is provided at the top of the placement groove 11. It can play a protective role.

[0040] In this embodiment, Figure 4 As shown, the entrance and exit of the heating conveying cavity 15 are both provided with a heat preservation curtain 14. The heat preservation curtain 14 can improve the heat preservation effect of the heating tunnel 1, thereby improving the heating efficiency. Figure 5 As shown, the heat preservation curtain 14 includes a plurality of baffles 141 connected in sequence, and two adjacent baffles 141 are hinged. When no external force is applied, the heat preservation curtain 14 is in a vertical state. When a workpiece passes through, the baffles 141 are pressed and flipped open, which will not affect the normal passage of the workpiece.

[0041] Example 2

[0042] like Figure 4 As shown, on the basis of Example 1, an air duct 17 is provided on the side wall of the heating tunnel 1 , one end of the air duct 17 is connected to the heating conveying chamber 15 , and the other end of the air duct 17 is connected to an exhaust fan 18 .

[0043] The exhaust fan 18 can be used for ventilation. On the one hand, the air inside the heating and conveying chamber 15 can be cooled down, and on the other hand, the air inside the heating and conveying chamber 15 can be replaced to avoid the accumulation of dust particles and other harmful substances generated by high temperature inside the heating and conveying chamber 15.

[0044] A filter plate 19 may be provided inside the air duct 17 , and the filter plate 19 may absorb impurities such as dust particles.

[0045] The top of the air duct 17 is provided with a strip hole, which is matched with the filter plate 19. The top of the filter plate 19 extends above the strip hole, that is, the filter plate 19 can be clamped in the strip hole, so that the filter plate 19 can be directly pulled out upwards for quick replacement. The top part of the filter plate 19 is not provided with a filter hole, so that the filter plate 19 can be clamped in the strip hole with a seal.

[0046] A sealing strip is provided on the inner wall of the strip-shaped hole along the circumferential direction, which can further improve the sealing and stability of the connection between the filter plate 19 and the strip-shaped hole.

[0047] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0048] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0049] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tunnel type continuous heating furnace, characterized in that: It comprises a heating tunnel (1), a frame (2), a conveying unit, and a pre-tightening unit; The conveying unit comprises a chain mesh belt (4) and at least four rotating shafts (3), wherein the rotating shafts (3) are rotatably mounted on the frame (2), rotating gears (5) are coaxially fixed at both ends of the rotating shafts (3), and the rotating gears (5) cooperate with the chains of the chain mesh belt (4); The pre-tightening unit comprises a pre-tightening shaft (6), a swinging rod (8), and a spring (9); the swinging rod (8) is hinged to the frame (2); two ends of the spring (9) are respectively connected to the swinging rod (8) and the frame (2); the pre-tightening shaft (6) is rotatably mounted on the swinging rod (8); two ends of the pre-tightening shaft (6) are coaxially fixed with pre-tightening gears (7); the pre-tightening gears (7) are matched with the chain of the chain-type mesh belt (4), so that the four rotating shafts (3) and the pre-tightening shaft (6) are connected by transmission through the chain-type mesh belt (4); The heating tunnel (1) is installed on the frame (2), and the heating tunnel (1) is covered on the outside of the chain mesh belt (4).

2. A tunnel type continuous heating furnace according to claim 1, characterized in that: A heating conveying chamber (15) is provided in the heating tunnel (1), and a fan (10) is provided at the top of the heating conveying chamber (15).

3. A tunnel type continuous heating furnace according to claim 2, characterized in that: The fan (10) is a turbulent flow fan.

4. A tunnel type continuous heating furnace according to claim 2, characterized in that: A placement groove (11) is provided at the bottom of the heating and conveying cavity (15), and a heating unit (12) is provided in the placement groove (11).

5. A tunnel type continuous heating furnace according to claim 4, characterized in that: A partition plate (13) is provided at the top of the placement groove (11).

6. The tunnel type continuous heating furnace according to claim 2, characterized in that: The inlet and outlet of the heating and conveying chamber (15) are both provided with heat-insulating curtains (14).

7. The tunnel type continuous heating furnace according to claim 6, characterized in that: The thermal insulation curtain (14) comprises a plurality of baffles (141) connected in sequence, and two adjacent baffles (141) are hinged.

8. The tunnel type continuous heating furnace according to claim 1, characterized in that: A motor is mounted on the frame (2), and a power output end of the motor is coaxially fixed to a rotating shaft (3).

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