A tunnel oven for baking pizzas

Abstract

The present application relates to the technical field of food processing, and particularly relates to a tunnel oven for baking pizza, an oven body and a conveying system, the conveying system comprising a driving unit, two transmission mechanisms and two conveying chains, the two transmission mechanisms being respectively located at opposite ends outside the oven body, the driving unit being arranged on a support outside the oven body and used for driving the transmission mechanisms to drive the two conveying chains to transmit in the length direction of the oven body, a pizza stone being connected between the two conveying chains, each conveying chain being provided with a connecting portion, two connecting portions being connected with a supporting seat, the pizza stone being arranged on the supporting seat, opposite ends of the supporting seat being provided with connecting seats, accommodation grooves being formed between the connecting seats and the upper surface of the supporting seat, opposite ends of the pizza stone being provided with plug-in portions, the two plug-in portions being respectively plug-in matched with the two accommodation grooves, and a compensation gap being further arranged between the plug-in portions and the connecting seats in the accommodation grooves, so as to prevent the pizza stone from being broken due to asynchronous transmission of the two conveying chains.

Description

Technical Field

[0001] This invention relates to the field of food processing technology, and in particular to a tunnel oven for baking pizzas. Background Technology

[0002] A tunnel oven (food processing type) is a tunnel-shaped mechanical device that bakes food through heat conduction, convection, and radiation. Inside the tunnel is a continuously operating conveyor system. During baking, the relative movement between the conveyor chain, steel belt, or mesh belt and the electric heating elements or direct-fired burners ensures uniform baking and transport of the food. This type of oven can operate continuously, has high production efficiency, and produces consistent baking quality.

[0003] However, existing tunnel ovens are generally only suitable for baking foods such as cookies, bread, and cakes, and cannot be used for baking pizzas. This is because when baking cookies, bread, and cakes, the conveyor system of a tunnel oven can use conveyor chains, steel belts, or mesh belts as conveyor units. However, when baking pizzas, considering the texture of the pizza, a pizza stone is usually needed to support the pizza and transfer heat. If a tunnel oven is used to bake pizzas, both ends of the pizza stone need to be connected to two conveyor chains, which would then drive the pizza stone to transport the pizza within the tunnel oven. This would make the pizza stone the conveyor unit for transporting the pizza. However, this method is prone to pizza stone breakage for the following reasons: When the temperature distribution within the tunnel oven is uneven, the two conveyor chains will be heated differently, resulting in differences in thermal expansion and contraction. This difference in thermal expansion and contraction will affect the asynchronous transmission of the two conveyor chains, causing the pizza stone to be stretched and eventually break.

[0004] Therefore, in the existing technology, pizzas can usually only be baked by pizza ovens, but pizza ovens are not as efficient as tunnel ovens, nor do they have the same consistent baking quality.

[0005] Therefore, there is an urgent need to propose a tunnel oven that can be used to bake pizzas. Summary of the Invention

[0006] One of the objectives of this invention is to provide a tunnel oven for baking pizza, which aims to solve the technical problem that the two conveyor chains are not driven synchronously due to the difference in thermal expansion and contraction inside the tunnel oven, resulting in the pizza slab being pulled and broken.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A tunnel oven for baking pizza includes an oven body and a conveying system. The conveying system includes a drive unit, two transmission mechanisms, and two conveyor chains. The two transmission mechanisms are respectively mounted on a front support and a rear support at opposite ends of the oven body. The drive unit is mounted on the rear support and is used to drive the transmission mechanisms to move the two conveyor chains along the length of the oven body. A pizza stone is connected between the two conveyor chains. Each conveyor chain has a connecting part, and a support base is connected between the two connecting parts. The pizza stone is placed on the support base. The support base has connecting seats at opposite ends, and a receiving groove is formed between the connecting seats and the upper surface of the support base. The pizza stone has insertion parts at opposite ends, and the two insertion parts are respectively inserted into the two receiving grooves to restrict the degree of freedom of the pizza stone in the horizontal and vertical directions. In the receiving groove, a compensation gap is also provided between the insertion part and the connecting seat. The compensation gap is used to prevent the two conveyor chains from being driven asynchronously due to the difference in thermal expansion and contraction in the furnace body, which would cause the pizza stone to be pulled and broken.

[0009] Furthermore, the connecting seat includes a mounting part, an inverted L-shaped extension part, and two enclosing parts. The mounting part is connected and fixed to the support seat. The inverted L-shaped extension part includes a vertical extension part and a horizontal extension part. One end of the vertical extension part is connected and fixed to the mounting part along the vertical direction of the furnace body. One end of the horizontal extension part along the width direction of the furnace body is connected and fixed to the other end of the vertical extension part. The two enclosing parts are respectively connected to both sides of the horizontal extension part along the length direction of the furnace body. A gap is provided between each enclosing part and the vertical extension part. The inverted L-shaped extension part, the two enclosing parts, and the upper surface of the support seat enclose and form the receiving groove.

[0010] Furthermore, within the oven body, the area above the pizza stone is designated as a far-infrared radiation area, and a far-infrared heater is provided in the far-infrared radiation area for heating the pizza conveyed on the pizza stone; the area below the pizza stone is designated as an open flame combustion area, and an open flame combustion tube is provided in the open flame combustion area for heating the pizza conveyed on the pizza stone.

[0011] Furthermore, multiple sets of waist-shaped grooves are formed on the bottom surface of the support base. Each set of waist-shaped grooves penetrates the upper and lower surfaces of the support base. Two adjacent sets of waist-shaped grooves are set as the first set of waist-shaped grooves and the second set of waist-shaped grooves. The waist-shaped grooves of the first set of waist-shaped grooves and the waist-shaped grooves of the second set of waist-shaped grooves are staggered and have different numbers.

[0012] Furthermore, multiple pizza slabs are provided, and the multiple pizza slabs are laid along the length of the oven body. Multiple support seats are also provided, and each support seat corresponds to one of the multiple pizza slabs. Multiple connecting parts are also provided on each conveyor chain and on each support seat. Each connecting part on each conveyor chain corresponds to one of the multiple pizza slabs, and each connecting seat on each support seat corresponds to one of the multiple pizza slabs.

[0013] Furthermore, the support base has reinforcing sections formed by bending on both sides along the length of the furnace body.

[0014] Furthermore, the compensation gap between the plug-in part and the connecting seat in the length and / or width direction of the furnace body is set to D1, and the relationship satisfied by D1 is: 1≤D1≤2mm.

[0015] Furthermore, the compensation gap between the upper surface of the plug and the connecting seat in the vertical direction of the furnace body is set to D2, and the relationship satisfied by D2 is: 1≤D1≤2mm.

[0016] Furthermore, the transmission mechanism includes two seated bearings and a rotating shaft. The two ends of the rotating shaft are rotatably connected to the two seated bearings respectively. Chain discs are also fixed at both ends of the rotating shaft. The two ends of the conveying chain are respectively connected to the chain discs on one rotating shaft and the chain discs on the other rotating shaft. Among them, the seated bearing on one of the transmission mechanisms is slidably connected to a guide rail provided on the front support. The guide rail extends along the length direction of the furnace body. The seated bearing on the other transmission mechanism is fixedly connected to the rear support. An elastic unit is connected between the seated bearing slidably connected to the guide rail and the end face of the furnace body facing the guide rail. The extension and contraction direction of the elastic unit is the same as the extension direction of the guide rail.

[0017] Furthermore, the surface of one conveyor chain facing the other conveyor chain is designated as a connecting surface, and each connecting part is disposed on the connecting surface of each conveyor chain, wherein the connecting part is integrally connected to the connecting surface.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In use, the pizza oven of the present invention features a pizza stone supported by a support base. The two ends of the pizza stone are connected to receiving grooves on the support base via insertion parts, thus restricting the pizza stone's freedom of movement in the horizontal and vertical directions. Based on this, the pizza to be baked is placed on the pizza stone, and the drive unit drives the transmission mechanism to move the conveyor chain along the length of the oven body, thereby conveying the pizza stone along the length of the oven body. When the conveyor chains are not synchronized due to uneven temperature distribution within the oven body, resulting in different heating levels and thermal expansion / contraction differences between the two conveyor chains, the compensation gap between the insertion part and the connecting base compensates for this difference in thermal expansion / contraction. In other words, the compensation gap allows the insertion part of the pizza stone a small amount of space to move within the receiving groove. Even if the two conveyor chains are not synchronized due to thermal expansion / contraction differences, they will not pull on the pizza stone, thus preventing breakage of the pizza stone due to the asynchronous transmission of the two conveyor chains. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the tunnel oven for baking pizza according to the present invention;

[0021] Figure 2 This is a schematic diagram of the connection between the furnace body, the rear support, and the front support according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the rear support structure according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram illustrating the connection between two conveyor chains and a pizza stone in an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of a single pizza stone connected to two conveyor chains according to an embodiment of the present invention;

[0025] Figure 6 for Figure 5 Another structural diagram from a different angle;

[0026] Figure 7 A top view of 6;

[0027] Figure 8 This is a cross-sectional view at point AA in section 7;

[0028] Figure 9 for Figure 8 Enlarged structural diagram at point B;

[0029] Figure 10 for Figure 7 Sectional view at CC;

[0030] Figure 11 This is a schematic diagram of the connecting seat according to an embodiment of the present invention;

[0031] Figure 12 for Figure 11 Another structural diagram from a different angle;

[0032] Figure 13 This is a schematic diagram of the structure of a pizza slab according to an embodiment of the present invention.

[0033] Numbering in each attached figure:

[0034] 1. Furnace body; 10. Far-infrared heater; 11. Open flame combustion tube; 12. Smoke exhaust system; 13. Air intake pipeline system; 2. Transmission mechanism; 20. Bearing with seat; 21. Rotating shaft; 210. Chain wheel; 3. Front support; 30. Guide rail; 31. Elastic unit; 4. Rear support; 5. Conveyor chain; 50. Connecting part; 6. Support seat; 60. Reinforcing part; 61. Waist-shaped groove; 7. Connecting seat; 70. Mounting part; 71. Vertical extension part; 72. Horizontal extension part; 73. Enclosure part; 74. Gap; 8. Pizza stone slab; 80. Insertion part; 9. Compensation gap; 90. Receiving groove. Detailed Implementation

[0035] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] In the description of this invention, it should be understood that the terms "width", "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Please refer to Figure 1 - Figure 13 This invention provides a tunnel oven for baking pizza, comprising an oven body 1 and a conveying system. The conveying system includes a drive unit, two transmission mechanisms 2, and two conveyor chains 5. The two transmission mechanisms 2 are respectively mounted on a front support 3 and a rear support 4 at opposite ends outside the oven body 1. The drive unit is mounted on the rear support 4 and is used to drive the transmission mechanisms 2 to drive the two conveyor chains 5 to move along the length of the oven body 1 within the oven body 1. Specifically, the drive unit is a drive motor. Each of the two transmission mechanisms 2 includes two bearings 20 and a rotating shaft 21. In one transmission mechanism 2, both ends of the rotating shaft 21 are rotatably connected to the two bearings 20, and chain discs 210 are fixed to both ends of the rotating shaft 21. Based on this structure, the output shaft of the drive motor is driven and connected to the rotating shaft 21 on the transmission mechanism set on the rear support. The two ends of the conveyor chain 5 are respectively connected to the chain disc 210 on one rotating shaft 21 and the chain disc 210 on another rotating shaft 21. Among them, each of the bearings 20 on the transmission mechanism 2 is slidably connected to two guide rails 30 slidably set on the front support 3. The guide rails 30 extend along the length direction of the furnace body 1, and the two guide rails 30 are spaced apart along the width direction of the furnace body 1. The bearing 20 on the other transmission mechanism 2 is fixedly connected to the rear support 4. An elastic unit 31 is connected between the bearing 20 slidably connected to the guide rail 30 and the end face of the furnace body 1 facing the guide rail 30. The elastic unit 31 is a spring, and the extension and contraction direction of the elastic unit 31 is the same as the extension direction of the guide rail 30. Therefore, by driving a rotating shaft 21 to rotate by a drive motor, the conveyor chain 5 can be driven to transport along the length of the furnace body 1. Since the conveyor chain 5 is affected by the high temperature inside the furnace body 1, according to the principle of thermal expansion and contraction, the conveyor chain 5 may become loose after long-term operation. Therefore, the elastic unit 31 can always keep the conveyor chain 5 in a taut state, thereby improving the conveying performance of the conveyor chain 5.

[0040] Based on the above structure, referring to Figure 2 , Figure 4 , Figure 5 and Figure 9A pizza stone 8 is connected between two conveyor chains 5. The pizza stone 8 extends along the width direction of the oven body 1, meaning that the opposite ends of the pizza stone 8 are connected to the two conveyor chains 5 respectively. Specifically, each conveyor chain 5 is provided with a connecting part 50, which extends along the width direction of the oven body 1 and is located within the gap between the two conveyor chains 5. A support base 6 is connected between the connecting parts 50 on the two conveyor chains 5, and the support base 6 can be fixed to the connecting part 50 by bolts. The pizza stone 8 is placed on the upper surface of the support base 6, and the opposite ends of the support base 6 are provided with connecting seats 7, which can be fixed to the connecting part 50 by bolts. A receiving groove 90 is formed between the connecting seat 7 and the upper surface of the support base 6. The opposite ends of the pizza stone 8 are provided with insertion parts 80, which are integrally connected to the pizza stone 8. The two insertion parts 80 on the pizza stone 8 are respectively inserted into the two receiving grooves to restrict the degree of freedom of the pizza stone 8 in the horizontal and vertical directions. In addition, a compensation gap 9 is provided between the insertion part 80 and the connecting seat 7 in the receiving groove. The compensation gap 9 is mainly used to prevent the two conveying chains 5 from being driven asynchronously due to the difference in thermal expansion and contraction in the furnace body 1, so as to prevent the pizza stone 8 from being pulled and broken.

[0041] To prevent the connecting part 50 from affecting the transmission of the conveyor chain 5, refer to Figure 5 The surface of one conveyor chain 5 facing the other conveyor chain 5 is designated as a connecting surface, and each connecting part 50 is disposed on the connecting surface of each conveyor chain 5, and the connecting part 50 is integrally connected to the connecting surface.

[0042] In summary, during use, the pizza stone 8 is supported by the support base 6, and the opposite ends of the pizza stone 8 are engaged with the receiving grooves 90 on the support base 6 via the insertion parts 80, thereby restricting the pizza stone 8's freedom in the horizontal and vertical directions. Based on this, the pizza to be baked is placed on the pizza stone 8, and the drive unit drives the transmission mechanism 2 to drive the conveyor chain 5 to move along the length of the oven body 1, thereby driving the pizza stone 8 to move along the length of the oven body 1. When the conveyor chain 5 is not uniformly heated due to uneven temperature distribution within the oven body 1, causing the two conveyor chains to... When the two conveyor chains 5 are heated to different degrees, they expand and contract differently due to thermal expansion and contraction. This causes them to drive asynchronously. The compensation gap 9 between the insertion part 80 and the connecting seat 7 compensates for the asynchronous drive of the two conveyor chains 5 caused by the difference in thermal expansion and contraction. In other words, the compensation gap 9 allows the insertion part 80 of the pizza slab 8 to have a small space to move within the receiving groove 90. Even if the two conveyor chains 5 are not driven asynchronously due to the difference in thermal expansion and contraction, they will not pull on the pizza slab, thus preventing the pizza slab 8 from breaking due to the asynchronous drive of the two conveyor chains 5.

[0043] Of course, both the connecting seat 7 and the support seat 6 are made of high-temperature resistant materials.

[0044] It should be noted that the pizza slate 8 mentioned above is made of iolite. Iolite can typically withstand temperatures of approximately 1350–1500 degrees Celsius. This characteristic allows iolite to maintain stable physical and chemical properties under high temperatures, making it less prone to deformation, cracking, or melting. Furthermore, iolite is neither too hard to be scratched nor too brittle to easily break; its low water absorption allows it to maintain good performance even in humid environments.

[0045] In one embodiment, reference is made to Figure 11 , Figure 12 The connecting seat 7 includes a mounting part 70, an inverted L-shaped extension, and two enclosing parts 73. The mounting part 70 is connected and fixed to the support seat 6. The inverted L-shaped extension includes a vertical extension 71 and a horizontal extension 72. One end of the vertical extension 71 is connected and fixed to the mounting part 70 along the vertical direction of the furnace body 1. One end of the horizontal extension 72 along the width direction of the furnace body 1 is connected and fixed to the other end of the vertical extension 71. The two enclosing parts 73 are respectively connected to both sides of the horizontal extension 72 along the length direction of the furnace body 1. A gap 74 is provided between each enclosing part 73 and the vertical extension 71. The inverted L-shaped extension, the two enclosing parts 73, and the upper surface of the support seat 6 enclose and form the above-mentioned receiving groove. Therefore, the gap 74 between the enclosure 73 and the vertical extension 71 gives the enclosure 73 a certain elastic deformation capacity relative to the vertical extension 71. When the two conveyor chains 5 are driven asynchronously, and the compensation gap 9 between the plug 80 and the connecting seat 7 in the length direction of the furnace body 1 is zero in the receiving groove, the force of the pizza stone 8 being pulled will be converted into the force of the plug 80 pressing the enclosure 73 along the length direction of the furnace body 1, so that the enclosure 73 will undergo a certain deformation, thus preventing the pizza stone 8 from being pulled and breaking.

[0046] It should be noted that, referring to Figure 2 , Figure 7 , Figure 8 and Figure 10 The compensation gap 9 between the plug-in part 80 and the connecting seat 7 in the length and / or width direction of the oven body 1 is set to D1, and D1 satisfies the relationship: 1≤D1≤2mm. In this embodiment, D1 is set to 1mm to avoid affecting the stability of the pizza stone 8 due to D1 being too large; in other embodiments, D1 can also be set to 2mm, which can be reasonably changed according to the actual situation.

[0047] Similarly, refer to Figure 2 , Figure 7 - Figure 9The compensation gap 9 between the upper surface of the plug-in part 80 and the connecting seat 7 in the vertical direction of the oven body 1 is set to D2, and D2 satisfies the relationship: 1≤D1≤2mm. In this embodiment, D2 is set to 1mm to avoid affecting the stability of the pizza stone 8 due to excessive D2; in other embodiments, D1 can also be set to 2mm, which can be reasonably changed according to the actual situation.

[0048] In one embodiment, reference is made to Figure 1 Inside the oven body 1, the area above the pizza stone 8 is set as a far-infrared radiation area, and a far-infrared heater 10 is installed in the far-infrared radiation area. The far-infrared heater 10 has a cylindrical structure and extends along the width direction of the oven body 1. The opposite ends of the far-infrared heater 10 are respectively fixed to the opposite side walls of the oven body 1 for heating the pizza conveyed on the pizza stone 8. The area below the pizza stone 8 is set as an open flame combustion area, and an open flame combustion tube 11 is installed in the open flame combustion area. The two ends of the open flame combustion tube 11 are respectively fixed to the opposite side walls of the oven body 1 for heating the pizza conveyed on the pizza stone 8. Therefore, it can be seen that the lower flame of the tunnel oven 1 of the present invention uses open flame tubes to heat the pizza on the pizza stone 8, and the upper flame uses far-infrared radiation technology to heat the pizza on the pizza stone 8. That is, the pizza is baked by combining open flame and far-infrared radiation (thermal radiation), so that the temperature inside the oven 1 can be precisely controlled. The lower flame inside the oven 1 is not lower than 300°C and the upper flame is not lower than 350°C, which is more conducive to improving the taste of the baked pizza.

[0049] Far-infrared radiation baking is a technology that utilizes far-infrared radiation for heating and baking. Far-infrared rays have a significant thermal effect and strong penetrating power. When far-infrared rays irradiate the surface of a pizza, they are absorbed by the pizza and converted into heat energy, thus achieving the heating and baking effect. Because of the strong penetrating power of far-infrared rays, they can penetrate deep into the interior of an object for heating, resulting in more uniform and efficient heating. Therefore, combining open flame with far-infrared radiation technology to bake pizza can improve its taste. Furthermore, how the open flame combustion tube 11 achieves food baking is existing technology and will not be elaborated here. Please refer to the tunnel oven disclosed in existing patent publication number CN108991050A.

[0050] For batch baking of pizzas, refer to Figure 4Multiple pizza stones 8 are provided, and correspondingly, multiple support seats 6 are also provided. Each support seat 6 corresponds to one pizza stone 8. Multiple connecting parts 50 on each conveyor chain 5 and multiple connecting seats 7 on each support seat 6 are also provided. Each connecting part 50 on each conveyor chain 5 corresponds to one pizza stone 8, and each connecting seat 7 on each support seat 6 corresponds to one pizza stone 8. Multiple pizza stones 8 are laid along the length of the oven body 1, thus achieving the purpose of batch baking pizzas.

[0051] In one embodiment, reference is made to Figure 6 Each support base 6 has multiple sets of waist-shaped grooves 61 on its bottom surface, which penetrate the upper and lower surfaces of the support base 6. Adjacent sets of waist-shaped grooves are designated as the first set and the second set. The waist-shaped grooves 61 in the first set and the second set are staggered and have different numbers. For example, the first set of waist-shaped grooves has three waist-shaped grooves, and the second set has two waist-shaped grooves. Each waist-shaped groove 61 extends along the width direction of the furnace body 1, and in either the first or second set of waist-shaped grooves, adjacent waist-shaped grooves 61 are evenly spaced along the length direction of the furnace body 1. Furthermore, the spacing between any two adjacent sets of waist-shaped grooves is the same. In summary, the waist-shaped groove 61 on the support base 6 can allow the heat from the lower fire to pass up and heat the pizza stone 8, thus improving the heating effect of the lower fire. At the same time, this waist-shaped groove 61 layout structure on the support base 6 can ensure that the strength of the support base 6 is not significantly uneven, effectively preventing the upper surface of the support base 6 from becoming uneven due to uneven strength, which could lead to the pizza stone 8 being pulled apart by internal stress in the vertical direction.

[0052] To enhance the strength of the support base 6, a reinforcing part 60 is formed by bending on both sides along the length of the furnace body 1. The reinforcing part 60 is used to enhance the strength of the support base 6 and prevent the support base 6 from deforming.

[0053] Of course, refer to Figure 1 The furnace body 1 is also equipped with an air intake pipeline system 13. The air intake pipeline system 13 is an existing system, comprising an air pipeline and a gas pipeline. A zero-pressure solenoid valve is installed on the open flame combustion tube 11. The air pipeline is connected to the open flame combustion tube 11, and the gas pipeline is connected to the open flame combustion tube 11 via the zero-pressure solenoid valve. The air pipeline is adapted to inject air into the open flame combustion tube 11, and the gas pipeline is adapted to inject fuel into the open flame combustion tube 11. The surface of the open flame combustion tube 11 has flame holes facing the pizza slab 8. The open flame combustion tube 11 is adapted to mix and ignite the injected air and fuel, and then eject the mixture from the flame holes to heat the pizza slab 8. For details, refer to a tunnel furnace disclosed in existing patent publication number CN108991050A.

[0054] In addition, refer to Figure 1 or Figure 2 The furnace body 1 is also equipped with a flue gas system 12, which is used to exhaust the flue gas inside the furnace body 1. The flue gas system 12 also uses the existing gas tunnel furnace air intake system, which will not be described here.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tunnel oven for baking pizza, comprising an oven body and a conveying system, the conveying system comprising a drive unit, two transmission mechanisms, and two conveyor chains, the two transmission mechanisms being respectively disposed on a front support and a rear support at opposite ends of the oven body, the drive unit being disposed on the rear support, for driving the transmission mechanisms to drive the two conveyor chains to move along the length of the oven body within the oven body, characterized in that, A pizza stone is connected between the two conveyor chains. Each conveyor chain is provided with a connecting part, and a support base is connected between the two connecting parts. The pizza stone is placed on the support base. Connecting seats are provided at opposite ends of the support base. A receiving groove is formed between the connecting seat and the upper surface of the support base. Insertion parts are provided at opposite ends of the pizza stone. The two insertion parts are respectively inserted into the two receiving grooves to restrict the freedom of the pizza stone in the horizontal and vertical directions. A compensation gap is also provided between the insertion part and the connecting seat in the receiving groove. The compensation gap is used to prevent the two conveyor chains from being driven asynchronously due to the difference in thermal expansion and contraction in the furnace, which could cause the pizza stone to be pulled and broken. The connecting seat includes a mounting part, an inverted L-shaped extension part, and two enclosing parts. The mounting part is fixedly connected to the support seat. The inverted L-shaped extension part includes a vertical extension part and a horizontal extension part. One end of the vertical extension part is fixedly connected to the mounting part along the vertical direction of the furnace body. One end of the horizontal extension part along the width direction of the furnace body is fixedly connected to the other end of the vertical extension part. The two enclosing parts are respectively connected to both sides of the horizontal extension part along the length direction of the furnace body. A gap is provided between each enclosing part and the vertical extension part. The inverted L-shaped extension part, the two enclosing parts, and the upper surface of the support seat enclose and form the receiving groove. The compensation gap between the plug-in part and the connecting seat in the length and / or width direction of the furnace body is set to D1, and the relationship satisfied by D1 is: 1≤D1≤2mm; The compensation gap between the upper surface of the plug-in part and the connecting seat in the vertical direction of the furnace body is set to D2, and the relationship satisfied by D2 is: 1≤D1≤2mm; The transmission mechanism includes two seated bearings and a rotating shaft. Both ends of the rotating shaft are rotatably connected to the two seated bearings, and chain discs are fixed to both ends of the rotating shaft. The two ends of the conveyor chain are respectively connected to the chain discs on one rotating shaft and the chain discs on the other rotating shaft. One seated bearing of the transmission mechanism is slidably connected to a guide rail mounted on the front support, the guide rail extending along the length of the furnace body. The other seated bearing of the transmission mechanism is fixedly connected to the rear support. An elastic unit is connected between the seated bearing slidably connected to the guide rail and the end face of the furnace body facing the guide rail. The extension and retraction direction of the elastic unit is the same as the extension direction of the guide rail.

2. The tunnel oven for baking pizza according to claim 1, characterized in that, Inside the oven, the area above the pizza stone is set as a far-infrared radiation area, and a far-infrared heater is provided in the far-infrared radiation area for heating the pizza conveyed on the pizza stone; the area below the pizza stone is set as an open flame combustion area, and an open flame combustion tube is provided in the open flame combustion area for heating the pizza conveyed on the pizza stone.

3. The tunnel oven for baking pizza according to claim 1, characterized in that, The bottom surface of the support base has multiple sets of waist-shaped grooves, each set of waist-shaped grooves penetrating the upper and lower surfaces of the support base. Two adjacent sets of waist-shaped grooves are designated as the first set of waist-shaped grooves and the second set of waist-shaped grooves. The waist-shaped grooves of the first set of waist-shaped grooves and the waist-shaped grooves of the second set of waist-shaped grooves are staggered and have different numbers.

4. The tunnel oven for baking pizza according to claim 1, characterized in that, Multiple pizza slabs are provided, and the multiple pizza slabs are laid along the length of the oven body. Multiple support seats are also provided, and each support seat corresponds to a multiple pizza slab. Multiple connecting parts are also provided on each conveyor chain and on each support seat. Each connecting part on each conveyor chain corresponds to a multiple pizza slab, and each connecting seat on each support seat corresponds to a multiple pizza slab.

5. The tunnel oven for baking pizza according to claim 4, characterized in that, The support base has reinforcing sections formed by bending on both sides along the length of the furnace body.

6. The tunnel oven for baking pizza according to claim 1, characterized in that, The surface of one conveyor chain facing the other conveyor chain is designated as a connecting surface, and each connecting part is disposed on the connecting surface of each conveyor chain, and the connecting part is integrally connected to the connecting surface.

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