Tomato catalytic infrared combined gradient negative pressure peeling equipment

Abstract

The application discloses a tomato catalytic infrared combined gradient negative pressure peeling equipment and relates to the technical field of food processing machinery. The device is composed of a catalytic infrared part, a gradient vacuum part and a cylindrical double-pass sealing device. The catalytic infrared part is provided with a catalytic infrared emitter, a gas pipeline is arranged on the emitter for combustible gas delivery, a roller capable of transporting and self-rotating tomatoes is arranged on a support below the emitter, and a cylindrical guide rail assembly is arranged at the tail end of the emitter. The assembly is small at one end close to the roller and large at one end close to the distribution box. The gradient vacuum part is provided with two groups of vacuum bins, different vacuum degrees are arranged in the vacuum bins, and an elastic peeling mechanism is arranged in the bin with a low vacuum degree. The cylindrical double-pass sealing device is provided with a shell and a rotor, different sizes of tomatoes can be distributed into the bins with different vacuum degrees through the holes with different sizes arranged on the two sides of the shell. The peeling rate is greatly improved through secondary gradient negative pressure, the peeling loss is reduced, and the peeling quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of food processing machinery, including the technology of using catalytic infrared and vacuum for food processing, and relates to a tomato peeling device. BACKGROUND

[0002] Tomato is an important vegetable crop in the world, and tomato as a food vegetable has been well known and widely planted. China is a large country in the production of tomato products. Tomatoes contain lycopene, vitamin C and other nutrients, and have multiple effects. The main processed products include tomato sauce, tomato juice, peeled tomatoes, etc. In the future, there will be more market share.

[0003] Peeling is a necessary and important link and factor in the processing of tomato products. Peeling tomato product processing is a labor-intensive industry, and the quality of food processing personnel is required. Under the current situation of rising raw material prices and labor shortage, the requirement for mechanization is also increasing. On this basis, a production device capable of efficient peeling, continuous production and ultra-low loss is proposed.

[0004] Domestic large-scale tomato planting started relatively late, and the design and development of tomato product processing equipment also started relatively late. Traditional enterprises mostly use hot dipping, enzyme method, alkali solution, etc. to peel the skin, and then use a peeling roller to peel the skin. This method is feasible, but it causes great damage to the flesh of peeled tomatoes, high loss and even fruit rupture. At the same time, the temperature of hot dipping peeling is not easy to control, which seriously affects the taste and flavor of tomato products.

[0005] Therefore, it is very important to improve the peeling efficiency and quality, reduce the water consumption and energy consumption of the peeling link, and reduce waste emissions. SUMMARY

[0006] The main purpose of the present application is to overcome the above problems and provide a new tomato peeling device.

[0007] In order to overcome the above technical problems, the technical scheme adopted by the present application is:

[0008] A tomato catalytic infrared combined gradient negative pressure peeling device, comprising a natural gas flame generator, a constant speed channeling device connected to the end of the natural gas flame generator, a catalytic infrared emitter directly above a tumbling transmission device, a cylindrical double-pass sealing device with a hopper welded and linked to the inlet, a high negative pressure skin explosion cabin sealed connected to the outlet of the cylindrical double-pass sealing device, and a low negative pressure skin rubbing cabin connected to the inlet of the high negative pressure skin explosion cabin through the outlet of the cylindrical double-pass sealing device.

[0009] The natural gas flame generator is provided with a pipeline for gas inlet at the back, and a layer of metal mesh at the front, and is fixed on the rack by screw connection and at an angle, and has the function of rapidly preheating the surface of tomatoes as the first processing procedure of the device.

[0010] The constant-speed channeling device comprises a cylindrical turning plate, a channeling disc, and a cylinder, the cylindrical turning plate is installed at the end of the natural gas flame generator and is fixed on the rack by screw connection and bearing, the channeling disc is installed on the rack by bearing, the motor provides rotating force for the cylindrical turning plate, and the cylinder provides power for the channeling disc, the cylindrical turning plate uniformly transports the tomatoes preheated by the natural gas flame generator to the channeling disc, and the channeling disc transports the tomatoes to three channels in the next step respectively.

[0011] The catalytic infrared emitter is provided with a pipeline for gas inlet at the back, and a layer of metal mesh at the front, and is composed of catalytic metal internally, and is welded at the uppermost end of the rack, and radiates infrared rays by catalyzing combustible gas to perform infrared radiation on the tomatoes.

[0012] The rolling transmission device comprises a roller, a rack, a chain plate, a driving motor, a chain wheel, and a synchronous wheel, the side surfaces of the roller and the chain plate are connected, the chain wheel is installed on the rack by a fixed support and is engaged with the chain plate, the driving motor provides power for the rotation of the chain wheel and the chain plate through the synchronous wheel, the rack is fixed between the roller and the rack by screw, the rack cooperates with the gear at the end of the roller to provide power for the rotation of the roller while the roller moves forward, and the chain plate drives the roller to move forward while keeping the rotation of the roller so that the tomatoes also move forward while rotating.

[0013] The rolling transmission device is installed directly below the catalytic infrared emitter, the tail end of the rolling transmission device is connected to the feeding box, and the tomatoes are subjected to catalytic infrared radiation and then enter the feeding box at the upper end of the inlet of the cylindrical double-pass sealing device through the rolling transmission device.

[0014] The cylindrical double-pass sealing device comprises a shell, a rotor in the shell, and a rotating shaft penetrating the rotor, the inlet of the shell is connected to the feeding box, the outlet of the shell is connected to the upper inlet of two high-negative-pressure chambers, the side edges of the shell are screw-connected to the rack by a fixed support, the rotor is installed in the shell and is fixed in the circumferential direction by bearings at both ends, the rotor is gap-fitted with the inner wall of the shell, the rotating shaft is connected to the rotor and extends out of the shell, the rotating shaft drives the rotor to rotate, the horizontal and vertical blades on the rotor separate the inside of the shell, and the cylindrical double-pass sealing device realizes stable pressure in the outlet while continuously feeding, and can sort two sizes of tomatoes into two high-negative-pressure chambers with different vacuum degrees.

[0015] The high negative pressure skin explosion cabin and the low negative pressure skin rubbing cabin are four cylindrical barrels with different diameters, and the two ends are connected with two cylindrical double-way sealing devices, and the main function of the high negative pressure skin explosion cabin is to provide a high vacuum environment for tomatoes and short-term placement.

[0016] The low negative pressure skin rubbing cabin includes a low negative pressure barrel, a spiral material conveying device, and a skin rubbing device (gear fixed support, skin rubbing element, transmission shaft, and tension gear), which are coaxially installed inside the barrel, synchronous wheels are installed at the ends of the spiral material conveying device and the skin rubbing device transmission shaft, a magnetic coupler is installed at the tail end of the spiral material conveying device, the low negative pressure barrel is fixed on the rack through bolts, the skin rubbing element in the skin rubbing device is installed between the two tension gears and kept in a tension state, the fixed support is installed around the tension gear and symmetrically arranged to provide fixed support for the tension gear, the magnetic coupler provides rotating force for the spiral material conveying device and drives the transmission shaft and the tension gear to rotate through the synchronous wheel, the tension gear is meshed with the transmission shaft gear for transmission, the spiral material conveying device pushes the tomatoes forward, and the skin rubbing element rotates axially under the drive of the tension gear.

[0017] The surface of the high negative pressure skin explosion cabin and the low negative pressure skin rubbing cabin is provided with an exhaust pipeline for extracting internal air;

[0018] The exhaust pipeline on the barrel of the low negative pressure skin rubbing cabin exhausts air outside the barrel to form a vacuum degree, the spiral material conveying device in the center of the barrel separates the skin of the tomatoes from the flesh under the action of the elastic elements of the skin rubbing device around the barrel while pushing the tomatoes forward, and the separation of the skin from the flesh is more thorough due to the existence of the vacuum degree in the barrel, the separation of the skin from the flesh is completed, and finally the cylindrical double-way sealing device at the discharge port of the low negative pressure skin rubbing cabin discharges the tomatoes.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The space formed between the blades of the rotor is divided into two parts, which can uniformly convey two specifications of tomatoes into the two high negative pressure skin explosion cabins with different sizes under the lower opening of the cylindrical double-way sealing device, and different vacuum degrees can be provided for tomatoes of different sizes, effectively reducing the probability of uneven skin explosion quality and deformation and damage caused by size difference between tomatoes.

[0021] The tumbling transmission device below the catalytic infrared emitter may cause the phenomenon that the tomatoes are stuck and cannot roll before improvement, resulting in uneven radiation, and part of the flesh is damaged due to long-time radiation, although the surface of the drum has certain patterns, but this phenomenon still exists, by changing the shape of the drum, increasing the friction contact area, and changing the pattern shape of the drum surface, the occurrence of such phenomenon is reduced.

[0022] Compared with traditional blanching peeling method, the catalytic infrared radiation can reduce the temperature change of tomatoes, greatly improve the quality of peeled tomato pulp, and greatly improve the safety.

[0023] Tomatoes in high negative pressure peeling cabin can make the tomato skin crack quickly, and the surface water evaporates quickly at the crack to produce the phenomenon of curling.

[0024] Tomatoes in low negative pressure peeling cabin can make the tomato skin fall off by the combined operation of the negative pressure formed in the cabin and the peeling element and the screw conveying device.

[0025] The peeling element has a certain roughness on the surface, and the peeling element rotates while rotating the tomato during the peeling process, so that the whole tomato skin is removed cleanly and uniformly. Since it has elasticity, it can reduce the damage to the pulp while peeling, and improve the peeling quality.

[0026] Tomatoes through secondary gradient negative pressure greatly improve the peeling rate, reduce the peeling loss and improve the peeling quality. BRIEF DESCRIPTION OF DRAWINGS

[0027] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0028] Figure 1 is a schematic diagram of the principle structure of the application;

[0029] Figure 2 is a schematic diagram of the structure of the cylindrical double-pass sealing device of the application, wherein the sectional view is used to express the internal structure in the view;

[0030] Figure 3 is a schematic diagram of the structure of the low negative pressure peeling cabin of the application;

[0031] Figure 4 is a schematic diagram of the principle structure of the tumbling conveying device;

[0032] Figure 5 is a schematic diagram of the outer reflection plate and aluminum cover plate of the catalytic infrared emitter;

[0033] Figure 6 is a schematic diagram of the principle of tensioning the gear ring fixation and transmission of the peeling device;

[0034] Figure 7 is a schematic diagram of the surface pattern of the roller;

[0035] Figure 8 is a schematic diagram of the hole position and friction particles of the screw conveying rod. DETAILED DESCRIPTION

[0036] In order to remove the tomato skin while improving the processing efficiency and processing quality while reducing the peeling loss, realize the full automatic mechanized production, in order to reduce the environmental pollution caused by traditional lye peeling and reduce the intake of heavy metal ions in human body, at the same time reduce the dependence of traditional hot peeling method and other energy-intensive processing, from the point of view of protecting the environment and people-oriented, further reduce the cost, improve the quality, a kind of tomato catalytic infrared combined gradient negative pressure peeling equipment is proposed.

[0037] Example 1

[0038] As shown in the figure, the specific implementation is realized as follows: the tomato freely rolls on the natural gas flame generator 1, and after a short period of flame roasting, the tomato is dropped on the downstream channeling disc 4 above the cylindrical turning plate 3 under the rotation of the cylindrical turning plate 3 at the end of the natural gas flame generator 1.

[0039] The cylindrical turning plate 3 includes a rotor, a rotating shaft coaxially connected with the rotor, a pulley 2 connected at the end of the rotating shaft, and a motor 14, the rotating shaft is connected with the rotor 3, the other end of the rotating shaft is provided with the pulley 2, the rotating shaft is fixed on the rack through bolts and bearings, the motor 14 drives the pulley 2 to rotate through the belt, and the cylindrical turning plate 3 is also driven to rotate, and the tomato is quantitatively and stably transported to the channeling disc 4 through the blades on the cylindrical turning plate 3.

[0040] The channeling disc 4 is driven by the power device 14 to rotate at a fixed angle and evenly distribute the tomato to the three channels of the tumbling transmission mechanism 17.

[0041] The channeling disc 4 is installed at the outlet of the cylindrical turning plate 3 and includes a power device 14 installed at the bottom end of the rotating shaft 19, a rotating shaft 19 welded at the bottom side of the channeling disc, and a channeling disc 4, one end of the rotating shaft 19 is fixed at the bottom of the channeling disc 4, the middle is fixed with the rack through bearings, and the other end is axially fixed with the power device 14, the power device 14 drives the rotating shaft 19 and the channeling disc 4 to rotate at a fixed angle, and the tomato transported to the channeling disc 4 through the cylindrical turning plate 3 is directionally transported to the specified channel of the tumbling transmission device 17.

[0042] The front end of the tumbling conveying device 17 is connected with the outlet of the channeling disc 4, and the tail end is connected with the feeding box 9 and is located below the catalytic infrared emitter 6. The tumbling conveying device 17 comprises a roller 7, chain plates 17-2 welded on both sides of the roller 7, a sprocket 18 fixed on the frame and in the same plane with the chain plates 17-2, a rack 17-3 installed on the frame and meshing with the gear 17-1 at both ends of the roller 7, and a motor 14. The roller 7 is provided with the gear 17-1 at both ends, the size of which is smaller than the diameter of the roller. Both ends of the roller 7 are fixed on the chain plates 17-2. The chain plates 17-2 are connected and fixed on the sprocket 18 fixed on the frame. The motor 14 provides rotating force for the sprocket 18 through a belt pulley. The gear 17-1 at both ends of the roller 7 meshes with the rack 17-3 installed on the frame. The forward movement of the roller 7 provides power for the self-rotation of the roller 7 through the meshing of the gear 17-1 and the rack 17-3.

[0043] The catalytic infrared emitter 6 is provided with a pipeline for the entry of combustible gas at the back and is provided with a layer of metal mesh at the front. The inside is composed of catalytic metal and is welded on the top end of the frame. The catalytic reaction of the combustible gas emits infrared rays to radiate the tomatoes.

[0044] The inlet of the cylindrical double-pass sealing device 10 is connected with the feeding box 9, and the outlet is connected with the high negative pressure skin explosion cabin 11. The cylindrical double-pass sealing device 10 comprises a shell 10-4 provided with openings at the upper part and the lower part and made of stainless steel, a rotating shaft 10-3 coaxially connected with a rotor 10-5, and the rotor 10-5 coaxially installed inside the shell 10-4. The rotor 10-5 is gap matched with the inner wall of the shell 10-4. The rotating shaft 10-3 is connected with the driving device 14 through a synchronous wheel 10-1 at the end of the rotating shaft 10-3. The driving device 14 of the cylindrical double-pass sealing device 10 is arranged at the side of the shell 10-4. The inlet of the shell 10-4 of the cylindrical double-pass sealing device is communicated with the feeding box 9 and the outlets are communicated with the inside of the two high negative pressure skin explosion cabins 11 and are connected through welding.

[0045] The tomatoes on the tumbling conveying device 17 are transferred to the two box bodies of the feeding box 9 through the sorting device 8 under the uniform radiation of the catalytic infrared emitter 6. The tomatoes enter the gap 10-7 between the rotor blades 10-8 inside the cylindrical double-pass sealing device 10 through the two inlets of the cylindrical double-pass sealing device 10 and the feeding box 9.

[0046] When the driving device 14 drives the rotating shaft 10-3 to rotate, the tomatoes are uniformly conveyed from the inlet to the outlet of the cylindrical double-pass sealing device 10 through the gap between the rotor blades 10-8, so that the tomatoes are quantitatively transported to the next process.

[0047] In this way, the probability of the tomatoes being broken due to being squeezed is effectively reduced. The two sizes of tomatoes are effectively transferred to the two high negative pressure skin explosion cabins 11 of different sizes. The vacuum degree in the cabin is effectively stabilized.

[0048] The high negative pressure burst skin cabin 11 and the low negative pressure burst skin cabin 12 are four cylindrical barrels with different diameters, and their two ends are connected with two cylindrical double-pass sealing devices 10. The main function of the high negative pressure burst skin cabin 11 is to provide a high vacuum environment for tomatoes and to place them temporarily.

[0049] The tomatoes transported through the cylindrical double-pass sealing device 10 enter the high negative pressure burst skin cabin 11 with two different sizes. The skins of the two specifications of tomatoes begin to crack under vacuum pressure, and the surface moisture begins to evaporate under the action of negative pressure. The high negative pressure burst skin cabin 11 is at an angle of 10° with the horizontal plane, and the tomatoes freely roll in the high negative pressure burst skin cabin 11 to the outlet. The outlet of the high negative pressure burst skin cabin 11 is connected with the inlet of another cylindrical double-pass sealing device 10.

[0050] The outlet of the high negative pressure burst skin cabin 11 is connected with the low negative pressure burst skin cabin 12 through the cylindrical double-pass sealing device 10, and the finished product is output through the cylindrical double-pass sealing device 10 at the outlet of the low negative pressure burst skin cabin 12.

[0051] The tomatoes in the high negative pressure burst skin cabin 11 are transported into the low negative pressure burst skin cabin 12 through the cylindrical double-pass sealing device 10. The tomatoes are driven forward by the spiral conveying device 12-5 and the skins are removed by the rotation of the skin rubbing device 12-8. Finally, the product is sent out through the cylindrical double-pass sealing device 10 at the tail.

[0052] The low negative pressure burst skin cabin includes a low negative pressure barrel 12-1, a spiral conveying device 12-5, a skin rubbing device (a gear fixed support 12-10, a skin rubbing element 12-3, a transmission shaft 12-4, a tensioning gear ring 12-2, a synchronous wheel 12-6, and a magnetic coupler 12-7). The low negative pressure barrel 12-1 is fixed on the rack by bolts. The spiral conveying device 12-5 is coaxially installed with the skin rubbing device. The skin rubbing element 12-3 is installed between the two tensioning gear rings 12-2 in a tensioning state. The gear fixed support 12-10 provides circumferential fixation for the tensioning gear ring 12-2. The synchronous wheel 12-6 is installed on the spiral conveying device 12-5 and the transmission shaft 12-4, respectively. The magnetic coupler 12-7 is installed at the end of the spiral conveying device 12-5. The magnetic coupler 12-7 provides rotating force for the spiral conveying device 12-5 and drives the transmission shaft 12-4 to rotate through the synchronous wheel 12-6. The tensioning gear ring 12-2 is in gear transmission with the transmission shaft 12-4. The spiral conveying device 12-5 pushes the tomatoes forward. The skin rubbing element 12-3 rotates under the drive of the tensioning gear ring 12-2.

[0053] The spiral conveying device 12-5 inside the low negative pressure peeling cabin 12 is specifically as follows: gear fixed supports 12-10 are arranged at both ends of the low negative pressure peeling cabin 12, a spiral conveying rod 12-5 is installed on the support frame through bearings, the distance between the blades of the spiral conveying rod 12-5 is greater than the diameter of the tomato, space is provided for the movement of the tomato to prevent the tomato from being stuck between the blades, a synchronous belt pulley 12-6 is arranged at one end of the spiral conveying rod 12-5, i.e. the discharge port side of the cylinder 12-1, to provide power for the transmission shaft 12-4 of the peeling device 12-8, a magnetic coupling 12-7 is arranged at the outlet side of the spiral conveying rod 12-5, and then the spiral conveying device 12-5 is driven by the driving device 14, so that the tomato moves along the spiral conveying device 12-5 from the inlet to the outlet of the cabin body 12-1, and power transmission through the magnetic coupling 12-7 can effectively ensure the sealing property.

[0054] The peeling device 12-8 inside the low negative pressure peeling cabin 12 is specifically as follows: a support 12-10 for fixing gears is arranged at both ends of the transmission shaft 12-4, two tensioning gear rings 12-2 for tensioning the peeling element 12-3, a transmission shaft 12-4 for rotating the tensioning gear ring 12-2, a synchronous pulley 12-6 arranged at one end of the shaft for driving the spiral conveying rod 12-5, four gears 12-4 at both ends for circumferentially fixing the tensioning gear ring 12-2, and a plane with a diameter greater than the gear tooth top circle arranged at one end of the transmission shaft 12-4 gear for axially fixing the tensioning gear ring 12-2.

[0055] The tomato specifically completes the advancing and peeling process in the low negative pressure peeling cabin 12 as follows: the tomato enters the low negative pressure peeling cabin 12 through the outlet of the cylindrical double-pass sealing device 10, the tomato advances along the gap between the blades 12-5 of the spiral conveying device, the top end of the blade is arranged in a gap with the peeling element 12-3, the purpose is to prevent the blade from crushing the tomato during the process of advancing again, resulting in the loss of nutrients of the product tomato, and the gap generated by the centrifugal force of the peeling element 12-3 should be smaller than the minimum diameter of the tomato.

[0056] The peels dropped by the peeling device 12-8 are thrown to the inner wall of the cabin body 12-1 under the action of centrifugal force, and the peels slide downward to the waste collecting device 13 after accumulating a certain thickness on the inner wall.

[0057] The tomato is output through the outlet of the cylindrical double-pass sealing device 10 at the tail end of the low negative pressure peeling cabin 12 after completing the above steps, and the above description shows that the present application realizes full-automatic mechanized continuous production, improves product quality, reduces labor intensity, reduces environmental pollution, and improves production efficiency.

[0058] Example 2

[0059] Further optimization based on embodiment 1, the difference is that the reflective plate 6-1 and aluminum cover plate 6-2 are installed on both sides of the gap between the tumbling conveying device 17 and the catalytic infrared emitter 6. The tomato on the tumbling conveying device 17 is mainly subjected to three kinds of heat: the thermal radiation of the catalytic infrared emitter 6 to the tomato, the thermal convection of the tomato skin to the air, and the heat conduction from the tomato skin to the internal pulp. Because the surface of the catalytic infrared emitter 6 is flat, the radiation area to the tomato is limited, and the addition of the reflective plate 6-1 on the side can effectively increase the radiation intensity on the side of the tomato. At the same time, the aluminum cover plate 6-2 can effectively reduce the area between the catalytic infrared emitter 6 and the tumbling conveying device 17 and the circulation of external air, reduce heat convection loss, and keep the internal temperature stable. The temperature of the emission plate of the catalytic emitter 17 remains stable, and the internal heat transfer time of the tomato is shortened. This can effectively improve the radiation processing rate of the tomato, reduce energy consumption, and improve processing quality.

[0060] Embodiment 3

[0061] Further optimization based on embodiment 1, the difference is that the drum 7 in the tumbling conveying device, the traditional cylindrical drum has a small contact area with the tomato. When encountering irregularly shaped or large tomatoes, the small contact area is not enough to provide the friction force for the tomato to turn over, resulting in uneven radiation of the tomato and reducing the processing quality of the tomato. The barrel body 9 is designed as a three-section arc, and the arc design increases the contact area between the tomato and the barrel body and increases the friction force. At the same time, knurling 17-1 is processed on the outer surface of the drum to increase the surface roughness and promote the rotation and forward movement of the tomato. This design greatly guarantees the quality of the tomato and avoids the phenomenon of local scorching caused by uneven radiation, which affects the taste.

[0062] Embodiment 4

[0063] Further optimization based on embodiment 1, the difference is that the surface of the blade 12-5 of the spiral conveying device is designed with a plurality of circular holes 12-5-1 and small friction particles 12-5-2. The diameter of the circular hole 12-5-1 is smaller than the minimum diameter of the tomato, which is beneficial to reducing the overall weight and facilitating uniform heat dissipation of the blade. The friction particles 12-5-2 work together with the peeling element 12-3 to improve the peeling efficiency.

Claims

1. A tomato catalytic infrared combined gradient negative pressure peeling device, characterized in that The device comprises a natural gas flame generator, a constant-speed channeling device connected to the end of the natural gas flame generator, a catalytic infrared emitter connected to the constant-speed channeling device and located above a tumbling transmission device, the tumbling transmission device located below the catalytic infrared emitter, an inlet box located at the end of the tumbling transmission device, a cylindrical double-pass sealing device connected to the outlet of the inlet box, a high-negative-pressure skin-bursting cabin connected to the outlet of the cylindrical double-pass sealing device, and a low-negative-pressure skin-rolling cabin connected to the outlet of the cylindrical double-pass sealing device. The natural gas flame generator is provided with a gas pipeline at the bottom, and the natural gas flame generator forms a 10° angle with the horizontal plane. The constant-speed channeling device comprises a cylindrical turning plate for quantitatively processing tomatoes, a belt pulley at one end of the cylindrical turning plate for driving the rotation of the cylindrical turning plate, and a channeling tray downstream of the cylindrical turning plate. The catalytic infrared emitter is located directly above the tumbling transmission device, and is provided with a gas pipeline at the back for gas entry and an exhaust fan for reducing the temperature at the back of the catalytic infrared emitter. The tumbling transmission device is located directly below the catalytic infrared emitter, and comprises a roller for rotating the tomatoes, a set of racks below both ends of the roller for cooperating with gears at both ends of the roller to rotate the roller, a set of chain plates for linking the roller, a set of chain wheels and a motor for driving the rotation of the chain plates, and the roller shaft is designed in a three-segment arc shape, and the surface is provided with a rhombic pattern. A set of high-negative-pressure skin-bursting cabins are connected to the outlet of the cylindrical double-pass sealing device, and the cylinder of the high-negative-pressure skin-bursting cabin is provided with an exhaust pipeline to extract air from the cylinder to form a high vacuum degree inside the cabin, so that the surface of the tomatoes is rapidly expanded, the skin moisture is rapidly evaporated, the combination of the flesh and the skin is destroyed, cracks are generated on the surface of the skin, the skin is formed, and the tomatoes freely roll down to the inlet of the cylindrical double-pass sealing device through the 5° inclined inner wall of the high-negative-pressure skin-bursting cabin. The cylindrical double-pass sealing device comprises a cylindrical stainless steel shell provided with two different size openings at the upper and lower parts, a stainless steel rotor with blades arranged at a certain angle inside the cylindrical stainless steel shell, and a rotating shaft penetrating the cylindrical stainless steel shell, wherein the stainless steel rotor is in clearance fit with the cylindrical stainless steel shell, the rotating shaft is connected with the stainless steel rotor and penetrates the cylindrical stainless steel shell to be connected with an external driving device; the cylindrical double-pass sealing device can continuously and uniformly convey two sizes of tomatoes to two high-negative-pressure skin-bursting cabins for skin-bursting treatment. The cylindrical double-pass sealing device is used for multi-stage transition and continuous use, and is respectively transitioned between the catalytic infrared emitter and the high-negative-pressure skin-bursting cabin, the high-negative-pressure skin-bursting cabin and the low-negative-pressure skin-rolling cabin, and the low-negative-pressure skin-rolling cabin and the outside, so as to form a relative pressure between the outside and the high-negative-pressure skin-bursting cabin, the high-negative-pressure skin-bursting cabin and the low-negative-pressure skin-rolling cabin, and the low-negative-pressure skin-rolling cabin and the outside, and two sizes of tomatoes are screened through the two different size inlet openings on the surface of the cylindrical stainless steel shell to enter two high-negative-pressure skin-bursting cabins with different vacuum degrees. The exhaust pipeline on the low negative pressure peeling cylinder extracts air from the cylinder to form a low vacuum degree inside the cylinder, the spiral material conveying device is coaxial with the peeling device, the spiral material conveying device forwards the tomatoes, and the peeling function is completed by the peeling element, so that the peeling function is completed while the continuous conveying is realized; In order to improve the radiation efficiency and range of the catalytic infrared emitter, a reflection plate and an aluminum cover plate are designed on both sides of the catalytic infrared emitter, the reflection plate is located above and below the aluminum cover plate, the reflection plate effectively improves the radiation range, and the aluminum cover plate effectively protects the internal temperature and reduces the heat loss of the radiation area caused by the external flowing air.

2. A tomato catalytic infrared combined gradient negative pressure peeling device according to claim 1, characterized in that The multi-stage negative pressure peeling technology is adopted to perform different processing operations under different vacuum degrees, and the cylinder double-way sealing device is used to separate the tomatoes of different sizes for fine processing, so that the different sizes of tomatoes are subjected to different negative pressure processing, thereby reducing the damage probability and improving the processing quality.

3. A tomato catalytic infrared combined gradient negative pressure peeling device according to claim 1, characterized in that, The surface of the blade of the spiral material conveying device is provided with densely arranged protrusions and circular holes with a diameter smaller than the minimum diameter of the tomatoes, the peeling element of the peeling device is made of an elastic element with a certain roughness on the surface, and the blade of the spiral material conveying device is gap arranged with the inner surface of the peeling element.

4. The tomato catalytic infrared combined gradient negative pressure peeling device according to claim 1, characterized in that, The peeling device comprises gear fixed frames at two ends, peeling elements connected with the fixed supports at two ends, a transmission shaft engaged with the gear fixed frames, and gear protrusions at two ends of the transmission shaft providing axial fixation for the tensioning gear ring, and four groups of transmission shafts providing circumferential fixation.

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