Hydraulic lift type oven with down door

Abstract

The application discloses a lower-door hydraulic lifting type oven and relates to the technical field of oven equipment. The oven comprises a machine body and a drying cavity. The machine body comprises an upper box body and a lower box body which can move towards the side of the upper box body and is sealed by abutting against the upper box body. The opposite surfaces of the upper box body and the lower box body are respectively provided with a concave cavity, and the two concave cavities are symmetrically distributed and form the drying cavity. The two sides of the drying cavity are respectively provided with a ventilation cavity which is communicated with the drying cavity. Each ventilation cavity is communicated with the external air environment through a pipeline. The openings of the two ventilation cavities which are away from the drying cavity are respectively import and export for feeding and discharging materials. The combination of the fixed upper box body, the lower box body which can move towards the side of the upper box body and is sealed by abutting against the upper box body, the drying cavity which is formed by the two symmetric concave cavities and the ventilation cavities which are communicated with the external air environment on the two sides can effectively improve the operation and maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, specifically a bottom-opening hydraulic lifting drying oven. Background Technology

[0002] In the field of roll drying and continuous drying equipment, common oven structures typically employ a fixed chamber with front, rear, or top-opening doors, or the entire chamber is lifted for easier cleaning and maintenance. However, these structures still present numerous problems in practical use.

[0003] For example, in the prior art, there is a Chinese utility model patent with publication number CN206763301U, entitled "A Liftable Adjustable Device for the Static Pressure Chamber of an Oven." This structure uses mechanisms such as cylinders, guide columns, and locking pins to allow the static pressure chamber to be adjusted up and down to adapt to tension and position changes during the membrane material's passage. Although this solution can improve membrane tension matching and channel adjustment, its overall oven structure remains fixed. Opening the door or entering the cavity still requires stopping the machine, disassembling, or relying on external channels. It cannot quickly open the oven for maintenance or membrane replacement under high temperatures, and it does not address the design aspects of cavity sealing and heat dissipation control.

[0004] For example, in the Chinese utility model patent with announcement number CN 202947448U, entitled "A High Synchronous Precision Lifting Mechanism for a Top-and-Bottom Opening Oven," the lifting structure uses a worm gear transmission to ensure synchronization and safety, and is suitable for scenarios where the oven needs to be lifted for maintenance or dust removal. This solution mainly focuses on the synchronous lifting and locking of the upper and lower oven bodies or doors, but does not specifically integrate the entire system structure, including the drying chamber, ventilation chamber, material conveying path, and thermal field control.

[0005] However, the above structures are mostly top or side-opening doors. When dealing with continuous membrane materials (especially when the membrane is broken or the material needs to be replaced quickly), it is difficult to quickly open the inside of the box for replacement or cleaning, resulting in long downtime and low efficiency. In addition, the fixed box and lifting door structure often do not fully consider the sealing and hot gas leakage when the box is closed, which can easily cause high-temperature gas to escape along the gaps, reduce thermal efficiency and affect the stability of the temperature field.

[0006] To address these issues, we propose a bottom-opening hydraulic lifting oven. Summary of the Invention

[0007] The purpose of this invention is to provide a bottom-opening hydraulic lifting oven to solve the problems of difficult maintenance and low efficiency of ovens in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A bottom-opening hydraulic lifting drying oven includes a body and a drying chamber. The body includes an upper chamber and a lower chamber that can move towards the upper chamber and be sealed together. The upper and lower chambers each have a concave cavity on their opposite sides, and the two concave cavities are symmetrically distributed to form the drying chamber. Each side of the drying chamber has a ventilation chamber that communicates with it. Each ventilation chamber is connected to the external air environment through a pipe. The openings of the two ventilation chambers on the side away from the drying chamber are the inlet and outlet for material entry and exit.

[0010] Furthermore, the concave cross-sections of the opposing surfaces of the upper and lower housings are both trapezoidal in shape.

[0011] Furthermore, each of the ventilation chambers has a horizontally placed conveyor roller, with two conveyor rollers arranged in parallel and located at the junction of the drying chamber and the adjacent ventilation chamber, respectively.

[0012] Furthermore, the side end of the conveying roller extends out of the ventilation cavity and is driven to rotate by the chain wheel assembly.

[0013] Furthermore, several heating tubes are horizontally arranged in the concave cavities on the opposite sides of the upper and lower boxes. The heating tubes are divided into two rows, and the space between the two rows of heating tubes forms a heating area for material movement.

[0014] Furthermore, the spacing between the heating tubes located in the lower housing cavity is smaller than the spacing between the heating tubes located in the upper housing cavity.

[0015] Furthermore, two rows of heating tubes for preheating the material are arranged horizontally in the ventilation cavity near the material inlet.

[0016] Furthermore, each of the ventilation chambers has at least one opening at the top, and the openings in the two ventilation chambers converge through a top-connected pipe and communicate with the external air environment.

[0017] Furthermore, the upper housing is provided with a number of temperature sensors, and the sensing ends of the temperature sensors extend into the recesses of the upper housing.

[0018] Furthermore, a sensor is elastically hinged to the outside of the lower housing, and a sensing unit that cooperates with the sensor is provided on the upper housing.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In this invention, by using a combination of a fixed upper chamber, a lower chamber that can move toward one side of the upper chamber and be sealed together, a drying chamber formed by two symmetrical concave cavities, and ventilation chambers on both sides that are connected to the outside, the efficiency of operation and maintenance can be effectively improved.

[0021] The lower chamber can be opened / closed along the lifting direction, which facilitates quick replacement or maintenance of materials and cleaning of residues in the chamber during the drying process, significantly shortening downtime and improving production continuity and maintenance convenience;

[0022] The two symmetrical concave cavities provide a wider contact / fitting surface when they are joined to form a drying chamber, which is conducive to the realization of a sealing structure, reduces the escape of high-temperature gas through gaps, thereby reducing energy loss and improving heat utilization.

[0023] Ventilation chambers are provided on both sides of the drying chamber and connected to the outside through pipes, which can form a controlled lateral ventilation path, suppress the disorderly dissipation of hot air along the inlet and outlet, help maintain a stable thermal environment in the drying chamber and reduce the impact of external heating, thus improving operational safety.

[0024] The ventilation chamber is arranged with the inlet and outlet on the side away from the drying chamber, which makes the material entry and exit path clear and facilitates cooperation with the continuous feeding device, thus promoting a stable feeding and discharging rhythm and uniform drying process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the main structure of the oven in an embodiment of the present invention;

[0026] Figure 2 As described in the embodiments of the present invention Figure 1 Schematic diagram of the structure at point A in the middle;

[0027] Figure 3 This is a side view of the oven structure in an embodiment of the present invention;

[0028] Figure 4 As described in the embodiments of the present invention Figure 3 Schematic diagram of the structure at point B;

[0029] Figure 5 This is a front view schematic diagram of the oven structure in an embodiment of the present invention;

[0030] Figure 6 This is a schematic cross-sectional view of the oven structure in an embodiment of the present invention;

[0031] Figure 7 As described in the embodiments of the present invention Figure 6 Schematic diagram of the structure at point C;

[0032] Figure 8 This is a frontal cross-sectional view of the structure in an embodiment of the present invention.

[0033] Figure label:

[0034] 1. Machine body; 10. Upper chamber; 101. Temperature sensor; 102. Sensing unit; 11. Lower chamber; 110. Hydraulic lifting device; 111. Sensor; 112. Spring; 12. Heating element; 2. Drying chamber; 21. Ventilation chamber; 210. Pipe; 211. Conveyor roller; 22. Chain wheel assembly. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example:

[0037] Reference Appendix Figure 1-8 This invention provides a bottom-opening hydraulic lifting oven, which consists of a body 1. The body 1 includes a fixed upper chamber 10 and a lower chamber 11 that can move relative to the upper chamber 10 to one side and seal against it. The bottom of the lower chamber 11 is connected to the hydraulic lifting device 110 via a buffer structure. The buffer structure is used to reduce the impact of movement during the lifting of the lower chamber 11, so that the lower chamber 11 can smoothly close or open with the upper chamber 10. The upper and lower chambers are mechanically locked in the closed position by positioning pins. The positioning pins are aligned with the mating surfaces to ensure that the two achieve an accurate relative positional relationship when closed, which facilitates the sealing surfaces to fit together and form a stable drying chamber 2.

[0038] Each of the upper chamber 10 and the lower chamber 11 has a concave cavity on its opposite surface. The two concave cavities are symmetrically arranged and together form the drying chamber 2 when closed. The cross-section of the concave cavity is an isosceles trapezoid. The slope of the trapezoidal sides makes the openings on both sides have an outward or downward sloping channel shape. This geometric arrangement can form a longer contact surface and a better thermal resistance path at the mating point, thereby reducing the tendency for lateral heat to directly dissipate. The isosceles trapezoid shape also facilitates the rational distribution of airflow in the cavity along the axial and lateral directions, making the temperature field in the heating area more uniform.

[0039] Each side of the drying chamber 2 is provided with a ventilation chamber 21, which is connected to the drying chamber 2. The side of the ventilation chamber 21 away from the drying chamber 2 serves as the material inlet and outlet. Each ventilation chamber 21 has at least one opening at the top. The openings in the two ventilation chambers 21 are respectively connected to the outside air environment through pipes 210 from the top. The pipes 210 after being connected are H-shaped when viewed from above. The center of the H-shaped pipes 210 is connected to the outside air environment.

[0040] The drying chamber 2 formed by the two isosceles trapezoidal concave cavities is symmetrical trapezoidal channel in cross-section. This shape makes the drying chamber 2 narrow in the lateral direction and form a controllable channel height in the vertical direction. The heated surface when the film roll passes through is mainly located in the space between the two rows of heating tubes 12.

[0041] The sidewalls of the isosceles trapezoid play a dual role in guiding heat flow and inhibiting lateral dissipation:

[0042] Its sloping structure extends the heat transfer path from the center of the cavity to the outside, increases lateral thermal resistance, and reduces the possibility of heat escaping directly through the mating gap.

[0043] At the same time, the inclined plane guides the convection streamlines inside the cavity, making the distribution of the main flow along the length and the microcirculation in the side cavity more regular, which is beneficial to the overall uniformity of the temperature field inside the drying cavity 2.

[0044] The symmetrical distribution of the upper and lower isosceles trapezoidal concave cavities also makes the contact surface at the mating point appear as a strip, which facilitates stable mechanical bonding by combining with the positioning pin. This arrangement, through its connection with the outside and the geometry of the manifold 210, can form a relative negative pressure zone in the side cavity during operation, so that the gas flowing outward from the ventilation cavity is concentrated and discharged through the manifold 210, thereby suppressing the high-temperature gas in the drying chamber 2 from escaping through the inlet and outlet, reducing heat loss and helping to maintain a stable thermal environment in the drying chamber.

[0045] A conveyor roller 211 is horizontally placed in each ventilation chamber 21. Two conveyor rollers 211 are arranged in parallel and located at the junction of the drying chamber 2 and the adjacent ventilation chamber 21, respectively. One conveyor roller is set near the inlet and one near the outlet of the machine body, forming a total of four conveyor rollers to form the material bearing and traction structure. The side ends of the conveyor rollers 211 extend out of the ventilation chamber 21 and are connected by a chain wheel set 22, which synchronously drives the rollers to rotate, so that the film roll can maintain uniform force and control the tensile tension when passing through the drying tunnel.

[0046] The chain wheel assembly 22 is driven by a power unit. The synchronous transmission with chain connection ensures coordinated speeds between the rollers, preventing film roll misalignment or breakage due to speed differences. The chain drive design fully considers the impact of the high-temperature environment inside the equipment on the transmission components. Compared with rubber or synthetic belts, the chain has higher heat resistance and reliability under high-temperature conditions.

[0047] Several heating tubes 12 are arranged horizontally within the recesses of the upper and lower chambers. The heating tubes 12 are divided into two rows, spaced apart along the length of the oven. When the material passes between the upper and lower rows of heating tubes, it enters the main heating zone to complete the drying process. The spacing between the heating tubes 12 in the recess of the lower chamber 11 is smaller than that in the recess of the upper chamber 10. This difference in spacing can create a higher local heat source density on the lower side to compensate for heat loss on the upper side and optimize the vertical thermal field, thereby improving the temperature consistency of both sides of the film roll.

[0048] The heating tubes 12 are horizontally placed in the upper and lower recesses of the housing and are divided into two rows. Their arrangement not only limits the direct area of ​​heat radiation and heat convection, but also forms a heating channel for material movement through the gap between the upper and lower rows.

[0049] The spacing between the heating elements 12 inside the lower housing 11 is smaller than the spacing between the heating elements 12 inside the upper housing 10. This difference in arrangement creates a gradual heat source density in the vertical direction.

[0050] When the film is located in the main heating zone, the denser heating tubes 12 on the lower side provide a higher local heat flux to compensate for the temperature drop on the upper side caused by leakage or heat transfer loss, thereby providing a closer distribution of heat power to both sides of the film.

[0051] The uniform spacing of the upper and lower rows of heating tubes 12 along the length direction ensures the continuity of the temperature field along the process, while the difference in the upper and lower spacing forms a necessary compensation effect in the vertical direction, so that the temperature difference between the upper and lower surfaces of the film can be reduced during the process of the film roll, thereby improving the drying uniformity.

[0052] The ventilation chamber 21 near the feeding position is also equipped with two rows of heating tubes 12 for preheating. This section gradually increases the temperature of the film roll through a gentler heat input, which improves the temperature difference change when entering the main heating zone. The preheating section reduces thermal shock by gradually increasing the temperature, improves the thermal stress distribution of the film roll, and is conducive to the stability of continuous production.

[0053] It should be noted that the arrangement of the ventilation cavity 21 and the I-shaped top manifold form an important boundary condition for the heat flow distribution of the drying cavity 2.

[0054] Each ventilation chamber 21 is connected to the drying chamber 2, but its distal side, serving as the inlet and outlet, allows the processed film roll to pass through a transition section between the ventilation chamber 21 and the drying chamber 2 during entry and exit, achieving preheating and attenuation. The opening above the ventilation chamber 21 is connected through a top collecting pipe 210. The collecting pipe 210 is I-shaped with its central outward opening located in the center of the I-shape. This layout provides equal or nearly equal gas collection paths for both ventilation chambers 21 laterally, thus creating a coordinated exhaust effect in the side chambers during operation. The geometric connection between the ventilation chamber 21 and the collecting pipe 210 ensures that the heat exchange between the drying chamber 2 and the outside environment mainly occurs along the upper path of the side chambers, creating a pressure situation at the inlet and outlet that is unfavorable for direct heat dissipation, thus promoting heat retention and recovery within the drying chamber 2.

[0055] Several temperature sensors 101 are arranged on the upper chamber 10, with their sensing ends extending into the recessed cavity of the upper chamber 10. The temperature sensors 101 are arranged longitudinally along the length of the oven to form multiple temperature measuring points. The temperature information collected by the temperature sensors 101 is sent to the control unit to realize zoned temperature control of the upper and lower rows of heating tubes 12, thereby maintaining a constant temperature along the process and ensuring the uniformity of the drying effect as much as possible. The sensing ends of the temperature sensors 101 extend into the recessed cavity of the upper chamber 10 to directly sense the temperature changes of the upper heating tubes 12 and the gas inside the cavity. The setting of multiple measuring points helps to reflect the local differences in the thermal field along the process, thereby maintaining the temperature continuity in the drying chamber 2 by adjusting the operating state of the heating tubes 12.

[0056] In addition, a temperature sensor 101 is also installed at the entrance. The longitudinal arrangement of the temperature sensor 101 facilitates the acquisition of temperature information for the preheating section and the main heating section, reflecting the thermal response of the film winding when it passes through different sections.

[0057] It should be noted that the location and number of temperature sensors 101 can be determined based on the length of the oven and process requirements, but it should be ensured that the temperature detection points of the critical heating section are fully covered.

[0058] A sensor 111 is elastically hinged to the upper outer side of the lower housing 11. The sensor 111 is connected to the lower housing 11 via an L-shaped bending plate. A spring 112 is connected to the concave side of the bending plate to provide preload and restoring force for mobility. The sensor 111 is a wheel-shaped component, with its outer end face facing the sensing unit 102 on the upper housing 10. The end of the sensing unit 102 facing the sensor 111 is spherical, and the spherical wall intersects with the outer end face of the wheel-shaped sensor 111.

[0059] When the lower chamber 11 is raised by the hydraulic lifting device 110 and approaches the upper chamber 10, the wheel-shaped sensor 111, under the action of the spring 112, contacts or approaches the spherical sensing unit 102, and the sensing unit 102 outputs a confirmation signal indicating that the chamber is in place. This detection signal, as part of the control logic, is used to confirm that the lower chamber 11 has reliably engaged with the upper chamber 10, ensuring that the drying chamber 2 is in a sealed or controlled state before heating and conveying are started.

[0060] The sensor 111, which is elastically hinged to the upper outer side of the lower housing 11, and the sensing unit 102 that cooperates with the upper housing 10 play a dual function of mechanical and detection during the mating process. The interaction between the spherical sensing unit 102 and the wheel-shaped sensor 111 provides electrical signal confirmation in addition to mechanical mating, ensuring that the drying chamber 2 is in an ideal mating state before heating and conveying are started. This mating structure can still allow a certain degree of adaptive mating when there are slight differences in assembly tolerances, ensuring the integrity of the contact surface of the upper housing 10 and the lower housing 11 when forming the drying chamber 2, thereby reducing the risk of high-temperature gas escaping through the mating gap.

[0061] In use, the film roll is introduced into the feed inlet and hung on the conveyor roller 211; the hydraulic lifting device 110 is activated to lift the lower box 11 until the positioning pin is in place and the sensor 111 / sensing unit 102 confirms that it is in place; then the drive chain wheel group 22 drives the conveyor roller 211 to rotate synchronously, and the film roll passes continuously through the preheating section and the main heating zone; the temperature sensor 101 monitors the temperature along the way, and the control unit performs zone control of the heating tube 12 accordingly to maintain the set temperature curve; the opening above the ventilation chamber 21 and its I-shaped collecting pipe 210 form a negative pressure in the side chamber when it is in operation, which suppresses the heat loss of the drying chamber 2 and maintains the stability of the thermal field.

[0062] The conveyor rollers 211 are placed horizontally in each ventilation chamber 21 and together with the rollers located at the inlet and outlet, they form a four-roller support and traction system. Each conveyor roller 211 is located at the junction of the drying chamber 2 and the adjacent ventilation chamber 21. Their arrangement allows the film roll to obtain continuous support when entering and exiting the main heating zone, avoiding loosening or poor local adhesion in the transition section.

[0063] The surface of the conveyor roller 211 maintains a relative positional relationship with the heating tubes 12 in the main heating zone and the preheating zone. When the film roll passes through the channel formed between the roller surface and the heating tubes, it is supported by the roller surface and receives heat input from the upper and lower heating tubes. The geometric positioning of the roller system directly affects the trajectory of the film roll in the channel and the uniformity of heating. The side end of the conveyor roller 211 passes through the ventilation cavity 21 and is driven to rotate by the chain wheel assembly 22. The chain wheel assembly 22 is arranged along the side wall of the machine body to realize the synchronous rotation of the roller system, so that the linear velocity of the film roll in the inlet, preheating and main heating zones is consistent, and the stability of the time and temperature relationship along the process is guaranteed.

[0064] The chain wheel assembly 22 and the conveyor roller 211 work together to form an integrated transmission link. The chain rotates along the outer edge of the side wall and pulls each roller. The geometric position of the chain wheel assembly 22 determines the relative arrangement of the roller system in the transverse and longitudinal directions, thus affecting the tension transmission and contact state of the film roll in the channel. When the conveyor roller 211 works with the chain wheel assembly 22, its axial position and bearing support must ensure that the roller surface and the heating tube 12 form a stable relative distance to avoid the film roll from contacting the heating tube or experiencing local warping when passing through. The four-roller layout makes the guidance at the inlet and outlet smoother. Especially when the film roll is transferred from the ventilation chamber 21 to the drying chamber 2, the roller surface provides the necessary curvature transition to reduce stress concentration.

[0065] If it is necessary to replace the film roll or clean the residual material in the chamber, the conveying can be stopped and the hydraulic lifting device 110 can be used to lower the lower chamber 11, thereby quickly opening the front end, making it easy for operators to enter or approach the drying chamber 2 for maintenance and replacement.

[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bottom-opening hydraulic lifting oven, characterized in that, include: The body (1) includes an upper housing (10) and a lower housing (11) that can move toward the upper housing (10) and be sealed together. The drying chamber (2) has a concave cavity on the opposite side of the upper box (10) and the lower box (11), and the two concave cavities are symmetrically distributed to form the drying chamber (2). Among them, the drying chamber (2) is provided with a ventilation chamber (21) on each side, and each ventilation chamber (21) is connected to the external air environment through a pipe (210). The openings of the two ventilation chambers (21) away from the drying chamber (2) are respectively the inlet and outlet for material entry and exit. The concave cross sections of the opposite surfaces of the upper box (10) and the lower box (11) are both trapezoidal in shape; Each of the ventilation chambers (21) has a horizontally placed conveyor roller (211), and the two conveyor rollers (211) are arranged in parallel and located at the junction of the drying chamber (2) and the adjacent ventilation chamber (21), respectively. Several heating tubes (12) are horizontally arranged in the concave cavities on opposite sides of the upper box (10) and the lower box (11). The heating tubes (12) are divided into two rows, and the space between the two rows of heating tubes (12) forms a heating area for material movement. The heating tubes (12) are evenly spaced along the length of the oven, and the spacing between the heating tubes (12) in the concave cavity of the lower box (11) is smaller than the spacing between the heating tubes (12) in the concave cavity of the upper box (10). Each of the ventilation chambers (21) has at least one opening at the top, and the openings in the two ventilation chambers (21) are connected to each other through a pipe (210) at the top and communicate with the external air environment.

2. The bottom-opening hydraulic lifting oven according to claim 1, characterized in that: The side end of the conveying roller (211) extends out of the ventilation cavity (21) and is driven to rotate by the chain wheel assembly (22).

3. The bottom-opening hydraulic lifting oven according to claim 1, characterized in that: Two rows of heating tubes (12) for preheating materials are arranged horizontally in the ventilation chamber (21) near the material inlet.

4. The bottom-opening hydraulic lifting oven according to claim 1, characterized in that: The upper housing (10) is provided with a number of temperature sensors (101), and the sensing ends of the temperature sensors (101) extend into the cavity of the upper housing (10).

5. The bottom-opening hydraulic lifting oven according to claim 1, characterized in that: A sensor (111) is elastically hinged to the outside of the lower housing (11), and a sensing unit (102) is provided on the upper housing (10) to cooperate with the sensor (111) for sensing.

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