PU foaming oven

Abstract

The present application relates to PU production process technical field, especially point to a kind of PU foaming oven, including machine body, heating module, upper transmission mechanism and lower transmission mechanism, upper transmission mechanism, lower transmission mechanism are installed in machine body, distance adjusting mechanism is provided between upper transmission mechanism and lower transmission mechanism, distance adjusting mechanism is used to adjust the distance between upper transmission mechanism and lower transmission mechanism;Heating module is set in machine body and is used to heat inside machine body, to bake PU material between upper transmission mechanism and lower transmission mechanism.The present application is cooperated with upper transmission mechanism and lower transmission mechanism, realizes the effect of " clamping " PU material transmission, the distance between upper transmission mechanism and lower transmission mechanism can be adjusted by distance adjusting mechanism, the function of adjusting PU material thickness according to the distance between upper transmission mechanism and lower transmission mechanism is realized, and flexibility is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to PU production process technical field, especially point to a kind of PU foaming oven. BACKGROUND

[0002] PU is polyurethane, full name is polyurethane, it is a kind of high molecular compound.

[0003] At present, PU material is widely used in household field, building field, commodity field, transportation field, household electrical appliances field and so on, and the density of PU material in different fields has different requirements. In the prior art, PU material is usually shaped and then baked to shape, but due to the volume change of PU material during baking process, the density of PU material will also change; Moreover, after baking and foaming, the volume change of PU material is usually irregular, so that PU material needs to be trimmed and shaped after shaping, which causes waste of PU material. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a PU foaming oven, which can limit the height change of PU material during transmission, thereby reducing the waste of PU material caused by subsequent trimming and shaping.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0006] The PU foaming oven provided by the present application comprises a body, a heating module, an upper conveying mechanism and a lower conveying mechanism, the upper conveying mechanism and the lower conveying mechanism are installed on the body, a distance adjusting mechanism is arranged between the upper conveying mechanism and the lower conveying mechanism, and the distance adjusting mechanism is used to adjust the distance between the upper conveying mechanism and the lower conveying mechanism; the heating module is arranged in the body and is used to heat the inside of the body to bake PU material between the upper conveying mechanism and the lower conveying mechanism.

[0007] Further, the distance adjusting mechanism comprises at least one distance adjusting component, the distance adjusting component comprises a contact piece, a limiting seat and a distance adjusting seat, the contact piece is movably arranged in the distance adjusting seat, and the contact piece is used to abut against the limiting seat;

[0008] The distance adjusting seat is arranged on the upper conveying mechanism, and the limiting seat is arranged on the lower conveying mechanism; or the distance adjusting seat is arranged on the lower conveying mechanism, and the limiting seat is arranged on the upper conveying mechanism.

[0009] When adjusting the distance, the relative position between the contact piece and the limiting seat is adjusted to control the lifting of the upper conveying mechanism relative to the lower conveying mechanism.

[0010] Further, the distance adjusting seat is provided with a threaded hole, the contact piece is provided with a control rod, the control rod is provided with a threaded section for threaded connection with the threaded hole, and the control rod is movably arranged in the distance adjusting seat.

[0011] Furthermore, the resistance member further includes a ruler, which is used to feedback the distance between the upper transmission mechanism and the lower transmission mechanism.

[0012] Furthermore, the number of the distance-adjusting components is more than two, and the more than two distance-adjusting components are arranged between the upper transmission mechanism and the lower transmission mechanism at intervals, and the distances between adjacent distance-adjusting components are equal;

[0013] The distance adjustment mechanism is used to perform the following steps:

[0014] Get the height difference of PU material before and after baking;

[0015] According to the height change difference, the curve of the PU material height changing with baking time is calculated;

[0016] Obtaining height values ​​corresponding to two or more adjustment component positions in the change curve;

[0017] Adjust the distance between the resistance member and the limit seat so that the distance is equal to the corresponding height value.

[0018] Furthermore, the machine body includes a base, a top cover and a lifting module, the lifting module includes two lifting cylinders, the top cover is located directly above the base, the two lifting cylinders are respectively arranged at both ends of the base, and the piston rods of the lifting cylinders are connected to the top cover; the upper transmission mechanism is arranged on the top cover, and the lower transmission mechanism is arranged on the base;

[0019] When the height of the PU material changes with the baking time, the two lifting cylinders are actuated to make the height of the input end of the machine body different from the height of the output end.

[0020] Furthermore, the upper transmission mechanism includes a drive module, a transmission belt, a first drive roller, a second drive roller, a first adjustment roller module, a second adjustment roller module and several adjustment modules. The drive module is used to drive the first drive roller and the second drive roller to rotate synchronously. The two ends of the transmission belt are respectively wrapped around the first drive roller and the second drive roller, and the transmission belt is used to contact the PU material; the first adjustment roller module is used to drive the first drive roller to rise and fall, and the second adjustment roller module is used to drive the second drive roller to rise and fall; the distance adjustment component is located between two adjacent adjustment modules, and the adjustment module is used to contact the transmission belt and adjust the tension of the transmission belt.

[0021] Furthermore, the heating module includes a heater, an air pump and two jet assemblies. The air pump is connected to the two jet assemblies through the heater. The two jet assemblies are respectively installed on the upper transmission mechanism and the lower transmission mechanism, and the two jet assemblies are arranged opposite to each other.

[0022] Further, the air jet assembly comprises a gas guide communicated with the heater, the gas guide is provided with a plurality of gas outlets, and a plurality of air jet nozzles are detachably arranged on the gas guide and communicated with the gas outlets one by one.

[0023] The air outlet directions of the n air jet nozzles at the two ends are arranged at an angle with the air outlet direction of the air outlet, n is a natural number and 1<=n<=3.

[0024] Further, the upper transmission mechanism and the lower transmission mechanism are respectively provided with a clearance hole corresponding to the air jet nozzle, and the gas blown out by the air jet nozzle contacts the PU material through the clearance hole.

[0025] A switch element is arranged between the air jet nozzle and the gas guide, and the switch element is used for controlling the flow resistance between the air jet nozzle and the gas guide.

[0026] The present application has the following beneficial effects: the upper transmission mechanism and the lower transmission mechanism are used to realize the effect of "clamping" the PU material for transmission, the distance between the upper transmission mechanism and the lower transmission mechanism can be adjusted by the distance adjusting mechanism, the distance between the upper transmission mechanism and the lower transmission mechanism can be adjusted according to the need to adjust the thickness of the PU material, and the flexibility is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the present application.

[0028] Figure 2 It is an internal schematic diagram of the present application.

[0029] Figure 3 It is a schematic diagram of the upper transmission mechanism, the lower transmission mechanism and the distance adjusting mechanism of the present application.

[0030] Figure 4 It is Figure 3 the enlarged view of A.

[0031] Figure 5 It is a schematic diagram of the distance adjusting assembly of the present application.

[0032] Figure 6 It is a schematic diagram of the air jet assembly of the present application.

[0033] Fig. 1 - body, 2 - heating module, 3 - upper transmission mechanism, 4 - lower transmission mechanism, 5 - distance adjusting mechanism, 11 - base, 12 - top cover, 13 - lifting cylinder, 21 - heater, 22 - air pump, 23 - air jet assembly, 24 - air guide, 25 - air jet nozzle, 31 - drive module, 32 - transmission belt, 33 - first drive roller, 34 - second drive roller, 35 - first roller adjusting module, 36 - second roller adjusting module, 37 - adjusting module, 38 - tension control module, 50 - distance adjusting assembly, 51 - abutting piece, 52 - limiting seat, 53 - distance adjusting seat, 54 - control rod, 55 - control head, 56 - scale. DETAILED DESCRIPTION

[0034] For the convenience of those skilled in the art, the present application is further described below in conjunction with the embodiments and the accompanying drawings, and the content mentioned in the embodiments is not a limitation of the present application. The present application is described in detail below in conjunction with the accompanying drawings.

[0035] As shown in Figures 1 to 6 The present application provides a PU foaming oven, which comprises a body 1, a heating module 2, an upper transmission mechanism 3 and a lower transmission mechanism 4. The upper transmission mechanism 3 and the lower transmission mechanism 4 are both installed on the body 1. A distance adjusting mechanism 5 is arranged between the upper transmission mechanism 3 and the lower transmission mechanism 4, and is used for adjusting the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4. The heating module 2 is arranged on the body 1 and is used for heating the inside of the body 1 to bake the PU material between the upper transmission mechanism 3 and the lower transmission mechanism 4.

[0036] In operation, the PU material to be baked is transmitted between the upper transmission mechanism 3 and the lower transmission mechanism 4. The PU material is driven by the lower transmission mechanism 4 to enter the body 1 and is transmitted. The PU material is heated and baked by the heating module 2 during the transmission process. The water vapor in the PU material is vaporized during the baking process, so that the PU material has holes inside. The water leaving the PU material will inevitably cause the PU material to expand. However, the height of the PU material is limited by the cooperation of the upper transmission mechanism 3 and the lower transmission mechanism 4 at this time, so that the PU material is limited in the height direction. Tests show that the volume change of the PU material is mainly in the height direction, and the volume change to the surrounding is very small. Therefore, the present application realizes the effect of limiting the excessive change of the volume of the PU material, so that the density of the volume of the PU material after being processed in the oven will not change too much. In addition, the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4 is adjustable by the distance adjusting mechanism 5, so that the height change of the PU material after baking can be flexibly controlled.

[0037] In the embodiment, the distance adjusting mechanism 5 comprises at least one distance adjusting assembly 50, the distance adjusting assembly 50 comprises an abutting piece 51, a limiting seat 52 and a distance adjusting seat 53, the abutting piece 51 is movably arranged in the distance adjusting seat 53, and the abutting piece 51 is used for abutting against the limiting seat 52;

[0038] The distance adjusting seat 53 is arranged on the upper conveying mechanism 3, and the limiting seat 52 is arranged on the lower conveying mechanism 4; or the distance adjusting seat 53 is arranged on the lower conveying mechanism 4, and the limiting seat 52 is arranged on the upper conveying mechanism 3.

[0039] When the distance is adjusted, the relative position between the abutting piece 51 and the limiting seat 52 is adjusted to control the lifting of the upper conveying mechanism 3 relative to the lower conveying mechanism 4.

[0040] In actual use, the present application has two installation modes: one is that the distance adjusting seat 53 is arranged on the upper conveying mechanism 3, and the limiting seat 52 is arranged on the lower conveying mechanism 4; the other is that the distance adjusting seat 53 is arranged on the lower conveying mechanism 4, and the limiting seat 52 is arranged on the upper conveying mechanism 3. Figure 1 、 2 In order to facilitate understanding, the embodiment and the accompanying drawings adopt the first installation mode.

[0041] When the distance needs to be adjusted, the relative position between the abutting piece 51 and the limiting seat 52 is adjusted to control the lifting of the upper conveying mechanism 3 relative to the lower conveying mechanism 4.

[0042] That is, before the present application works, for example, in an oven used in the PU foaming process, the worker first adjusts the distance between the distance adjusting seat 53 and the limiting seat 52 by controlling the lifting of the abutting piece 51 on the distance adjusting seat 53, so as to control the lifting of the upper conveying mechanism 3 relative to the lower conveying mechanism 4, so as to achieve the effect of adjusting the distance. When conveying, the lower conveying mechanism 4 supports the product, and at the same time, the upper conveying mechanism 3 presses the product, and at the same time, the two convey the product at a substantially same speed, so that the thickness of the product does not change greatly in the conveying process due to the limiting of the lower conveying mechanism 4 and the upper conveying mechanism 31, that is, the change of the density caused by the foaming of the product is avoided, and the waste of the product caused by excessive cutting of the product during subsequent trimming is also avoided, and the waste of the product is reduced.

[0043] In the embodiment, the distance adjusting seat 53 is provided with a threaded hole, the abutting piece 51 is provided with a control rod 54, the control rod 54 is provided with a threaded section used for threaded connection with the threaded hole, and the control rod 54 is movably arranged in the distance adjusting seat 53. Through the threaded arrangement, the worker only needs to rotate the control rod 54 to drive the control rod 54 to extend or retract in the distance adjusting seat 53, so as to achieve the effect of changing the distance between the distance adjusting seat 53 and the limiting seat 52, that is, the function of simply and accurately adjusting the distance between the upper conveying mechanism 3 and the lower conveying mechanism 4 is achieved.

[0044] In the embodiment, the abutting member is provided with a control head 55, which is twisted by a worker to drive the control rod 54 to rotate. The width of the control head 55 is greater than that of the control rod 54, so that the worker can more easily drive the control rod 54 to rotate.

[0045] Specifically, the abutting member 51 further comprises a scale 56, which is used to feedback the distance between the upper conveying mechanism 3 and the lower conveying mechanism 4.

[0046] In actual installation, a shell of the scale 56 can be installed on the control head 55, and only rises and falls with the control head 55 without rotating with the control head 55, so that the change of the scale pointed by the scale 56 to the same position of the distance adjusting seat 53 can achieve the effect of visually observing the change of the distance between the distance adjusting seat 53 and the limiting seat 52, and further achieve the effect of feedbacking the distance between the upper conveying mechanism 3 and the lower conveying mechanism 4.

[0047] It should be noted that the above-mentioned display method is not unique, and the embodiment only shows one way, and does not need to be described in detail, but will not affect the understanding of the scheme by those skilled in the art.

[0048] Specifically, the abutting member 51 is detachably connected with the control rod 54. That is, the worker can replace the abutting member 51 according to the wear degree of the abutting member 51 when needed. The detachable connection between the abutting member 51 and the control rod 54 can be achieved by plug-in or threaded connection.

[0049] In the embodiment, the number of the distance adjusting assemblies 50 is two or more, and the two or more distance adjusting assemblies 503 are arranged between the upper conveying mechanism 3 and the lower conveying mechanism 4.

[0050] Through the arrangement of the two or more distance adjusting assemblies 50, the distances between the positions of the upper conveying mechanism 3 and the lower conveying mechanism 4 are basically the same, so as to ensure the reliable control of the thickness of the product.

[0051] It should be noted that the upper conveying mechanism 3 and the lower conveying mechanism 4 of the present application are conventional conveying mechanisms, which will not be described in detail here.

[0052] In the embodiment, the distance adjusting mechanism 5 is used to perform the following steps:

[0053] Obtaining the height change difference of the PU material before and after baking;

[0054] According to the height change difference, the curve of the height of the PU material changing with the baking time is calculated;

[0055] Obtaining the height values corresponding to the positions of the two or more adjusting assemblies in the change curve;

[0056] The distance between the resisting member 51 and the limiting seat 52 is adjusted so that the distance is equal to the corresponding height value.

[0057] For example, the height of the PU material when entering the present invention is H, and the desired height when leaving the present invention is 1.2H. Assuming that the height change rate of the PU material in the present invention is constant, the present invention can be set in the following two ways:

[0058] One method is to directly adjust the distance between each position of the upper transmission mechanism 3 and the lower transmission mechanism 4 to 1.2H. This method is the easiest to implement, but it will make the internal pore size of the PU material larger.

[0059] The other is set up in a linear manner, that is, the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4 at the action position of the first distance adjusting component 50 is 1.05H, the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4 at the action position of the second distance adjusting component 50 is 1.1H, the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4 at the action position of the third distance adjusting component 50 is 1.15H, and the distance between the upper transmission mechanism 3 and the lower transmission mechanism 4 at the action position of the second or more distance adjusting components 50 is 1.2H.

[0060] By setting it up in this way, the foaming expansion of the PU material can be controlled, that is, as the PU material is transmitted, its height change rate remains basically unchanged, and the upper transmission mechanism 3 and the lower transmission mechanism 4 always contact the PU material during the transmission process, ensuring the stability of the transmission.

[0061] The present invention mainly uses the second setting method, which can allow the PU material to change in height in a controllable manner and can also prevent the PU material from being suddenly squeezed during expansion, which may affect the performance parameters.

[0062] Specifically, the machine body 1 includes a base 11, a top cover 12, and a lifting module. The lifting module includes two lifting cylinders 13. The top cover 12 is located directly above the base 11. The two lifting cylinders 13 are respectively arranged at both ends of the base 11. The piston rods of the lifting cylinders 13 are connected to the top cover 12. The upper transmission mechanism 3 is arranged on the top cover 12, and the lower transmission mechanism 4 is arranged on the base 11.

[0063] When the height of the PU material changes with the baking time, the two lifting cylinders 13 are actuated to make the height of the input end of the machine body 1 different from the height of the output end.

[0064] In other words, in actual use, two baffles can be positioned between the top cover 12 and the body 1 to prevent internal heat from being dissipated too quickly. Furthermore, by raising the two lifting cylinders 13 (preferably pneumatic or hydraulic cylinders) to different heights, the relative position of the upper and lower conveyor mechanisms 3 and 4 can be maintained stable.

[0065] Specifically, the upper conveying mechanism 3 comprises a driving module 31, a conveying belt 32, a first driving roller 33, a second driving roller 34, a first roller adjusting module 35, a second roller adjusting module 36, and a plurality of adjusting modules 37, the driving module 31 is used to drive the first driving roller 33 and the second driving roller 34 to rotate synchronously, two ends of the conveying belt 32 are wound around the first driving roller 33 and the second driving roller 34 respectively, and the conveying belt 32 is used to abut against the PU material; the first roller adjusting module 35 is used to drive the first driving roller 33 to ascend and descend, and the second roller adjusting module 36 is used to drive the second driving roller 34 to ascend and descend; the pitch adjusting assembly 50 is located between two adjacent adjusting modules 37, and the adjusting module 37 is used to abut against the conveying belt 32 and adjust the tension of the conveying belt 32.

[0066] In actual use, the driving module 31 is preferably composed of a motor and a speed reducer, and a belt can be used for transmission between the two driving rollers; or the driving module 31 has two, which respectively drive the first driving roller 33 and the second driving roller 34 to rotate, and the consistency of the actions of the two is maintained through a synchronizer. In the present application, the first roller adjusting module 35 and the second roller adjusting module 36 are respectively arranged on the first driving roller 33 and the second driving roller 34, which are used in cooperation with the adjusting modules 37: when the height change of the PU material requires more precision, in addition to the action of the pitch adjusting assembly 50, the height of the conveying belt 32 at a specific position can also be changed by the adjusting module 37 between the two pitch adjusting assemblies 50, so that the adjusting mode of the present application is more flexible, and the control of the height change of the PU material during the expansion process is more accurate.

[0067] The first roller adjusting module 35 and the second roller adjusting module 36 are arranged to compensate for the change of the tension of the conveying belt 32 after the adjusting module 37 acts on the conveying belt 32, and the embodiment preferably further has a plurality of tension control modules 38, wherein the tension control module 38 is arranged at the top of the conveying belt 32 away from the lower conveying mechanism 4 (i.e. the top), the number of the tension control module 38 is multiple, and the tension control module 38 is distributed above and below the top of the tension belt; the tension control module 38 comprises an abutting wheel and a lifting control member, the tension control member controls the lifting of the abutting wheel, which can be a pneumatic cylinder or a hand-operated screw rod structure, and the abutting wheel abuts against the conveying belt 32.

[0068] In the present embodiment, the heating module 2 comprises a heater 21, an air pump 22, and two air jet assemblies 23, the air pump 22 is communicated with the two air jet assemblies 23 through the heater 21, the two air jet assemblies 23 are respectively installed on the upper conveying mechanism 3 and the lower conveying mechanism 4, and the two air jet assemblies 23 are arranged opposite to each other.

[0069] The present application draws outside air into the heater 21 with the air pump 22, heats the air in the heater 21, and then transmits the heated air to the air jet assembly 23, which sprays the heated air to the PU material, thereby achieving the effect of baking the PU material by heating it, and ensuring the effect of heat transfer.

[0070] Specifically, the air jet assembly 23 includes an air guide 24 and a plurality of air jet nozzles 25, the air guide 24 is in communication with the heater 21, the air guide 24 is provided with a plurality of air outlets, and the air jet nozzles 25 are detachably arranged on the air guide 24, and the plurality of air jet nozzles 25 are in one-to-one correspondence with the plurality of air outlets.

[0071] The air outlet directions of the n air jet nozzles 25 at both ends are arranged at an angle with the air outlet directions of the air outlets, n is a natural number and 1≤n≤3.

[0072] In actual use, the first end (i.e. the end where the PU material enters the present application) has two inclined air jet nozzles 25, and the angle of the air jet nozzles 25 is preferably 45° inclined and directed towards the transmission direction of the PU material; the last end (i.e. the end where the PU material leaves the present application) also has two inclined air jet nozzles 25, and the last end air jet nozzles 25 and the first end air jet nozzles 25 are both directed towards the upper transmission mechanism 3 / the lower transmission mechanism 4 but in opposite directions. The inclined air jet nozzles 25 mainly play the role of blocking the airflow, i.e. for the gas blown out by the middle air jet nozzles 25, more of it is retained in the present application after being blocked by the "air curtain" blown out by the first end / last end air jet nozzles 25, reducing the loss of energy.

[0073] Specifically, the upper transmission mechanism 3 and the lower transmission mechanism 4 are respectively provided with a clearance hole corresponding to the air jet nozzles 25, and the gas blown out by the air jet nozzles 25 contacts the PU material after passing through the clearance hole.

[0074] The clearance holes are evenly distributed on the transmission belts 32 of the upper transmission mechanism 3 and the lower transmission mechanism 4, so that the hot gas blown out by the air jet nozzles 25 can directly pass through the clearance holes and contact the PU material, thereby ensuring the baking effect.

[0075] A switching element is arranged between the air jet nozzles 25 and the air guide 24, and the switching element is used to control the flow resistance between the air jet nozzles 25 and the air guide 24. The switching element is preferably a solenoid valve, i.e. the solenoid valve is used to control whether the corresponding air jet nozzles 25 blow out gas, thereby controlling the position and number of air jet nozzles 25 blowing out gas to achieve the functions of temperature control and PU material baking effect control, making the present application more flexible.

[0076] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the present application are within the scope of the technical solution of the present application.

Claims

1. A PU foaming oven, characterized by: The machine body includes a heating module, an upper transmission mechanism, and a lower transmission mechanism. The upper transmission mechanism and the lower transmission mechanism are both installed on the machine body. A distance adjustment mechanism is provided between the upper transmission mechanism and the lower transmission mechanism. The distance adjustment mechanism is used to adjust the distance between the upper transmission mechanism and the lower transmission mechanism. The heating module is provided in the machine body and is used to heat the interior of the machine body to bake the PU material between the upper transmission mechanism and the lower transmission mechanism. The distance adjustment mechanism includes at least one distance adjustment component, the distance adjustment component includes a resistance member, a limit seat and a distance adjustment seat, the resistance member is movably arranged on the distance adjustment seat, and the resistance member is used to resist the limit seat; The distance adjusting seat is arranged on the upper transmission mechanism, and the position limiting seat is arranged on the lower transmission mechanism; or the distance adjusting seat is arranged on the lower transmission mechanism, and the position limiting seat is arranged on the upper transmission mechanism; When adjusting the distance, the relative position between the abutment and the limit seat is adjusted to control the lifting and lowering of the upper transmission mechanism relative to the lower transmission mechanism; The distance adjusting seat is provided with a screw hole, the abutment is provided with a control rod, the control rod is provided with a threaded section for threaded connection with the screw hole, and the control rod is movably provided in the distance adjusting seat; The number of the distance-adjusting components is more than two, and the more than two distance-adjusting components are arranged between the upper transmission mechanism and the lower transmission mechanism at intervals, and the distances between adjacent distance-adjusting components are equal; The distance adjustment mechanism is used to perform the following steps: Get the height difference of PU material before and after baking; According to the height change difference, the curve of the PU material height changing with baking time is calculated; Obtaining height values ​​corresponding to two or more distance adjustment component positions in the change curve; Adjust the distance between the resistance piece and the limit seat so that the distance is equal to the corresponding height value; The upper transmission mechanism includes a driving module, a transmission belt, a first driving roller, a second driving roller, a first adjusting roller module, a second adjusting roller module and several adjusting modules. The driving module is used to drive the first driving roller and the second driving roller to rotate synchronously. The two ends of the transmission belt are respectively wound around the first driving roller and the second driving roller. The transmission belt is used to contact the PU material; the first adjusting roller module is used to drive the first driving roller to rise and fall, and the second adjusting roller module is used to drive the second driving roller to rise and fall; the distance adjustment component is located between two adjacent adjusting modules, and the adjusting module is used to contact the transmission belt and adjust the tension of the transmission belt; The heating module includes a heater, an air pump and two jet assemblies. The air pump is connected to the two jet assemblies through the heater. The two jet assemblies are respectively installed on the upper transmission mechanism and the lower transmission mechanism, and the two jet assemblies are arranged opposite to each other.

2. The PU foaming oven according to claim 1, characterized in that: The resistance member further includes a ruler, which is used to feed back the distance between the upper transmission mechanism and the lower transmission mechanism.

3. The PU foaming oven according to claim 1, characterized in that: The machine body includes a base, a top cover, and a lifting module. The lifting module includes two lifting cylinders. The top cover is located directly above the base. The two lifting cylinders are respectively arranged at both ends of the base. The piston rods of the lifting cylinders are connected to the top cover. The upper transmission mechanism is arranged on the top cover, and the lower transmission mechanism is arranged on the base. When the height of the PU material changes with the baking time, the two lifting cylinders are actuated to make the height of the input end of the machine body different from the height of the output end.

4. The PU foaming oven according to claim 1, characterized in that: The air injection assembly includes an air guide and a plurality of air nozzles, the air guide is connected to the heater, the air guide is provided with a plurality of air outlets, the air nozzles are detachably arranged on the air guide, and the plurality of air nozzles are connected to the plurality of air outlets in a one-to-one correspondence; The air outlet directions of the n air nozzles at both ends are arranged at an angle to the air outlet direction of the air outlet, where n is a natural number and 1≤n≤3.

5. The PU foaming oven according to claim 4, characterized in that: The upper transmission mechanism and the lower transmission mechanism are respectively provided with clearance holes corresponding to the air nozzles, and the gas blown out of the air nozzles contacts the PU material after passing through the clearance holes; A switching piece is provided between the air nozzle and the air guide piece, and the switching piece is used to control the flow resistance between the air nozzle and the air guide piece.

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