Automatic lifting structure, heating equipment and method for identifying thickness of food material

Abstract

The invention relates to an automatic lifting structure, in particular to an automatic lifting structure, heating equipment and a method for identifying the thickness of food materials, the automatic lifting structure comprises a transmission mechanism and a driver, the transmission mechanism comprises a fixing frame, a driving part and a lifting supporting frame, and the fixing frame is provided with a slide rheostat; the moving end of the slide rheostat is driven by one side, away from the tray, of the lifting supporting frame, and the moving distance of the side, close to the tray, of the lifting supporting frame can be measured according to resistance changes of the slide rheostat. The slide rheostat is applied to measuring the moving distance of the lifting supporting frame, the moving end of the slide rheostat is driven by the lifting supporting frame, so that the lifting supporting frame drives the moving end to generate displacement when moving, and the internal resistance value of the slide rheostat is changed when the moving end generates displacement; the corresponding actual moving distance of the lifting supporting frame can be measured by comparing the front resistance value and the rear resistance value of displacement of the sliding rheostat at the moving end, and the cooking effect of food processing of the heating equipment is facilitated.

Description

Technical Field

[0001] This invention relates to an automatic lifting structure, specifically an automatic lifting structure capable of measuring the moving distance, a heating device, and a method for identifying the thickness of food ingredients. Background Technology

[0002] A steak grill (also known as a steak machine) is a kitchen appliance specifically designed for grilling steaks. It is commonly found in homes and small restaurants. It typically uses electric heating and is equipped with upper and lower heating plates, allowing for single-sided or double-sided heating. Some models have a striped pressure plate that can create charred marks and drain excess oil. Due to its high efficiency, ease of cleaning, and small footprint, it has gradually become a practical tool for preparing Western-style dishes in modern kitchens.

[0003] Existing steak machines have certain shortcomings in adapting to steaks of different thicknesses. Common models have a fixed and difficult-to-adjust spacing between the upper and lower heating plates, which makes it difficult for thick steaks to close completely, causing them to be over-compressed, lose juices, and affect the taste. On the other hand, thin steaks (such as those less than 1 cm) are heated unevenly and the center is difficult to cook through. Therefore, steak machines need a lifting structure with adjustable cooking height to adapt to the cooking thickness of different steaks.

[0004] The prior patent application with application number 202520771996X discloses a lifting transmission mechanism that can be used for cooking steaks. It uses a drive component to drive a linkage component to raise or lower the grill pan. It can adapt to the cooking thickness of different steaks and solves the problem of replacing manual pressing of the steak surface to achieve even heating. However, the linkage component used in the prior patent application can only move upward or downward in a directional manner during the actual lifting process. It cannot measure the actual distance the tray moves during the lifting or lowering process, making it difficult to further refine the control of the cooking process. Summary of the Invention

[0005] To address the aforementioned problem that existing lifting transmission mechanisms cannot measure the actual distance traveled during the lifting or lowering process, the technical solution adopted by this invention is as follows: An automatic lifting structure capable of measuring movement distance includes a transmission mechanism for moving a tray and a driver for driving the transmission mechanism. The transmission mechanism includes a fixed frame for mounting the driver, an active component mounted on the fixed frame and driven by the output end of the driver, and a lifting support frame driven by the active component and movably connected to the bottom of the tray. The fixed frame is equipped with a sliding rheostat. The driver drives the bottom position of the lifting support frame to move laterally and drives the top position of the lifting support frame to move the tray vertically. During the movement, the bottom position of the lifting support frame drives the moving end of the sliding rheostat. The movement distance of the lifting support frame near the tray can be measured based on the change in the resistance value of the sliding rheostat.

[0006] As described above, an automatic lifting structure capable of measuring movement distance includes a lifting support frame comprising a driven guide sleeve that is connected to the driving member. The outer side of the driving member is provided with a first transmission structure, and the driven guide sleeve is provided with a second transmission structure for connecting to the first transmission structure.

[0007] As described above, an automatic lifting structure capable of measuring movement distance is provided, wherein the driving component is a transmission screw, the first transmission structure is an external thread structure, and the second transmission structure is an internal thread structure adapted to the first transmission structure. The first transmission structure includes a positive thread a extending from the center toward the side close to the driver and a negative thread b extending from the center toward the side away from the driver. The driven guide sleeve includes a first guide sleeve and a second guide sleeve respectively disposed on the positive thread a and the negative thread b. The lifting support frame includes a first support frame and a second support frame respectively disposed on the first guide sleeve and the second guide sleeve. The first guide sleeve and the second guide sleeve are symmetrically arranged with respect to the middle part of the first transmission structure. The driver drives the active component to bring the first guide sleeve and the second guide sleeve closer to each other, so that the bottoms of the first support frame and the second support frame approach each other and the tray descends in the vertical direction; The driver drives the active component to move the first guide sleeve and the second guide sleeve away from each other, so that the bottoms of the first support frame and the second support frame move away from each other and the tray rises in the vertical direction.

[0008] As described above, an automatic lifting structure capable of measuring movement distance is provided with a micro switch triggered by the driven guide sleeve. The micro switch is electrically connected to the driver. The micro switch is located at a first position c when the tray rises to the highest position and the driven guide sleeve is located at a second position d when the tray falls to the lowest position. When the driven guide sleeve moves, it drives the moving end of the sliding rheostat.

[0009] A heating device capable of identifying the thickness of food ingredients includes an upper tray and a lower tray for heating the food ingredients, a cooking cavity for placing the food ingredients is provided between the upper tray and the lower tray, and an automatic lifting structure as described in any one of the claims is installed at the bottom of the lower tray, which can determine the separation distance between the upper tray and the lower tray based on the resistance change of the sliding rheostat when the lower tray rises to its highest position.

[0010] The heating device described above, which can identify the thickness of food, further includes a base for mounting the automatic lifting structure and a flip cover for mounting the upper tray. A pressure sensor for detecting the pressure on the food is installed between the upper tray and the flip cover. The pressure sensor is electrically connected to the driver. Several pressure sensors are symmetrically arranged around the center of the upper tray near the corners of the cooking cavity.

[0011] As described above, in a heating device capable of identifying the thickness of food ingredients, the flip cover is hinged to the base via a rotational self-locking structure. The rotational self-locking structure includes a self-locking fixing block that limits the mounting on the base and a push-button rotating shaft that limits the mounting on the flip cover. The self-locking fixing block has a locking hole into which the push-button rotating shaft extends. The locking hole is provided with a positioning recess for limiting the rotational position of the push-button rotating shaft. The surface of the push-button rotating shaft has a positioning protrusion for engaging with the positioning recess. After the push-button pivot extends into the lock hole, it engages with the positioning recess through the positioning protrusion to lock its relative rotational position with respect to the lock hole, or the push-button pivot is displaced by an external force, causing the positioning protrusion to disengage from the positioning recess to unlock its relative rotational position with respect to the lock hole.

[0012] As described above, in a heating device capable of identifying the thickness of food ingredients, the flip cover is also hinged to the base via a rotating wire-passing structure. The base includes a first hinge portion and a second hinge portion located on opposite axial sides of the hinge position and coaxially arranged. The rotating self-locking structure is installed on the first hinge portion, and the rotating wire-passing structure is installed on the second hinge portion. The first circuit chamber of the base for accommodating electronic components is connected to the second circuit chamber of the flip cover for accommodating electronic components via the rotating wire-passing structure.

[0013] A method for identifying the thickness of food ingredients is applicable to a heating device with an automatic lifting structure. The heating device has a pressure sensor installed on the upper tray and a transmission mechanism installed on the lower tray. The transmission mechanism has a lifting support frame, a driver for driving the lifting support frame, and a sliding rheostat driven by the lifting support frame. The method includes: In the unloaded state, the transmission mechanism drives the lower tray to rise until it contacts the upper tray, thereby triggering the pressure sensor; The heating equipment obtains the first resistance value from the sliding rheostat. Under load, the transmission mechanism drives the lower tray to rise so that the food contacts the upper tray, thereby triggering the pressure sensor. When the lower tray rises, the driver drives the bottom position of the lifting support frame to move laterally, and the bottom position of the lifting support frame drives the moving end of the sliding rheostat. The heating equipment obtains a second resistance value from the sliding rheostat. The first height position of the lower tray when the pressure sensor is triggered under no-load conditions is determined based on the first resistance value of the sliding rheostat, and the second height position of the lower tray when the pressure sensor is triggered under load conditions is determined based on the second resistance value of the sliding rheostat. The thickness of the food under load is obtained by calculating the difference between the first height position and the second height position.

[0014] As described above, in a method for identifying the thickness of food ingredients, the driver drives the bottom position of the lifting support frame to move laterally via a threaded transmission through the driving component. The lifting support frame is driven by the driving component through the driven guide sleeve, and the moving end of the sliding rheostat is driven by the driven guide sleeve. The transmission mechanism also includes a micro switch for feedback of the travel limit position. The micro switch is located at the first position c when the tray rises to the highest position and the second position d when the tray falls to the lowest position. When the driven guide sleeve moves, it drives the moving end of the sliding rheostat. The method includes: In the no-load state, when the lower tray rises to the highest position, the driven guide sleeve triggers the micro switch in the first position c, thereby triggering the output terminal of the driver to reverse, or triggering the heating device to collect the sliding rheostat to obtain the third resistance value; When the lower tray descends to its lowest position, the driven guide sleeve triggers the micro switch in the second position d, thereby triggering the output of the driver to reverse, or triggering the heating device to collect the fourth resistance value from the sliding rheostat; The third height position of the lower tray when it is at its highest position is determined by the third resistance value of the sliding rheostat, and the fourth height position of the lower tray when it is at its lowest position is determined by the fourth resistance value of the sliding rheostat. The maximum distance between the upper and lower pallets under no-load conditions is obtained by calculating the difference between the third and fourth height positions. The maximum lifting distance of the pallet under load is obtained by calculating the difference between the second and fourth height positions. The thickness of the food under load is obtained by calculating the difference between the maximum interval distance and the maximum rise distance.

[0015] The beneficial effects of this invention are as follows: This invention applies a sliding rheostat to measure the moving distance of a lifting support frame. The moving end of the sliding rheostat is driven by the lifting support frame, causing the moving end to displace when the lifting support frame moves. This displacement changes the internal resistance of the sliding rheostat. By comparing the resistance of the sliding rheostat before and after the displacement at the moving end, the actual moving distance of the lifting support frame can be measured. By comparing the difference between the maximum lifting distance of the lifting support frame under no-load and the maximum lifting distance under load, the heating equipment can identify the thickness of the food. This allows the heating equipment to further adjust its cooking strategy based on the thickness of the food, improving the cooking effect of the heating equipment. Attached Figure Description

[0016] Figure 1 This is a perspective view of a heating device that can identify the thickness of food ingredients according to the present invention.

[0017] Figure 2 This is a three-dimensional cross-sectional view of a heating device that can identify the thickness of food ingredients according to the present invention.

[0018] Figure 3 This is a front sectional view of an automatic lifting structure capable of measuring moving distance according to the present invention when it is lowered to its lowest position.

[0019] Figure 4 This is a front sectional view of an automatic lifting structure capable of measuring moving distance according to the present invention when it is raised to its highest position.

[0020] Figure 5 This is a perspective view of an automatic lifting structure capable of measuring the moving distance according to the present invention.

[0021] Figure 6 for Figure 5 Enlarged view of the internal structure, A.

[0022] Figure 7 This is an exploded perspective view of an automatic lifting structure capable of measuring moving distance according to the present invention.

[0023] Figure 8 This is an exploded perspective view of the rotational self-locking structure and the rotational line-passing structure of the present invention.

[0024] Figure 9 This is one of the internal structural diagrams of the base and flip cover of the present invention.

[0025] Figure 10 The second internal structure diagram of the base and flip cover of the present invention is shown.

[0026] Figure 11 This is a schematic diagram of the flip cover opening posture of the present invention.

[0027] Figure 12This is a cross-sectional structural diagram of the self-locking fixing block or the wire-passing fixing block of the present invention.

[0028] Figure 13 This is a perspective view of the push-button rotating shaft of the present invention. Detailed Implementation

[0029] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are only some embodiments of the technical solution of this application, and not all embodiments. Based on the embodiments of the technical solution of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the technical solution of this application.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the technical solution of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] Furthermore, the descriptions involving "first," "second," etc., in the technical solutions of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0032] Example 1 Figures 3 to 7 This embodiment provides an automatic lifting structure capable of measuring movement distance, including a transmission mechanism 1 for moving a tray and a driver 2 for driving the transmission mechanism 1. The transmission mechanism 1 includes a fixed frame 11 for mounting the driver 2, an active member 12 mounted on the fixed frame 11 and driven by the output end of the driver 2, and a lifting support frame 13 driven by the active member 12 and movably connected to the bottom of the tray. A sliding rheostat 3 is mounted on the fixed frame 11. The driver 2 drives the bottom position of the lifting support frame 13 to move laterally and drives the top position of the lifting support frame 13 to move the tray vertically. During the movement, the bottom position of the lifting support frame 13 drives the moving end of the sliding rheostat 3. The movement distance of the lifting support frame 13 near the tray can be measured according to the change in the resistance value of the sliding rheostat 3.

[0033] Specifically, in this embodiment, the transmission mechanism 1 used to move the pallet in the lifting structure is assembled from a fixed frame 11, an active component 12, and a lifting support frame 13. The fixed frame 11 is installed inside the heating equipment 5 to fix the position of the lifting structure. The driver 2 is installed on the outside of the fixed frame 11. The active component 12 is rotatably connected to the through hole of the fixed frame 11 via a bearing or directly. One end of the active component 12 is connected to the output end of the driver 2, so that when the driver 2 is started, it can drive the active component 12 to rotate around its axis through the output end. The lifting support frame 13 is installed between the active component 12 and the pallet. The power transmission conversion component converts the horizontal linear movement of the bottom of the lifting support frame 13 driven by the active component 12 into a vertical linear movement of the top of the lifting support frame 13. More specifically, the lifting support frame 13 uses connecting rods 133 hinged to the bottom of the pallet and the transmission structure of the active component 12, forming a connecting rod drive structure that can drive the pallet to move up and down. The lifting support frame 13 uses multiple connecting rods 133 that abut against the bottom of the pallet, simultaneously providing support and bearing force during driving. In order to enable adjacent connecting rods 133 to move synchronously, the connecting rods 133 with the same direction of movement and adjacent to each other... The connecting rods 133 and 134 are fixedly connected by a reinforcing plate 134. Known processes such as welding, riveting, and integral molding can be used for this connection. The preferred method is integral molding of the reinforcing plate 134 and connecting rod 133, which reduces the number of parts and assembly time, thus lowering production difficulty and cost. In this case, adjacent connecting rods 133 form a unified structure that can move synchronously through the reinforcing plate 134. During lifting and lowering, the driver 2 drives the active component 12 to transmit power to the connecting rods 133 of the lifting support frame 13, enabling the lifting support frame 13 to move... The tray rises or falls vertically while remaining horizontally positioned. Because the adjacent connecting rods 133 can move synchronously with rigid support through the reinforcing plate 134, uneven force on one side during the lifting and lowering process is avoided. This effectively improves the stability of the lifting structure during the tray's lifting process, providing a powerful and uniform pressing force for the steak during cooking. This promotes even heating of the steak and prevents it from tilting or deviating during the lifting process, thus improving the cooking quality and effect of the heating equipment 5 and realizing the food lifting function of the heating equipment.

[0034] Specifically, in this embodiment, the sliding rheostat is a circuit element that changes its resistance value by changing the position of its moving end, thereby determining the position of the moving end by measuring the resistance value. To identify the thickness of the food during the cooking process, this embodiment calculates the moving distance of the tray by measuring the resistance change of the sliding rheostat. When the lifting support frame 13 moves the tray vertically upwards or downwards, it moves the moving end of the sliding rheostat 3 within its measured stroke. The change in position of the moving end of the sliding rheostat 3 causes a change in its internal resistance. The heating device can calculate the actual distance the tray moves vertically by measuring the resistance of the sliding rheostat 3. Figures 3 to 5 For example, the straight-line distance between the center of the first hinge end s of the lifting support frame 13 and the center of the second hinge end t of the lifting support frame 13 forms the first straight side x; the straight-line distance between the center of the first hinge end s of the lifting support frame 13 and the central axis of the driving member 12 forms the second straight side y; and the straight-line distance between the center of the second hinge end t of the lifting support frame 13 and the second straight side y forms the third straight side z. The first straight side x, the second straight side y, and the third straight side z form a right-angled triangle relationship that can express the movement and change of the three. Here, the first straight side x is the inclined straight side in the right-angled triangle relationship, the second straight side y is the vertical straight side in the right-angled triangle relationship, and the third straight side z... Side z is the horizontal straight side in the right triangle relationship. Since the first hinge end s and the second hinge end t of the lifting support frame 13 are located at the beginning and end of the connecting rod 133 of the lifting support frame 13 in the length direction, the length of the connecting rod 133 is fixed, that is, the length of the first straight side x is also a fixed value. When the driver 2 drives the active member 12 to move the second hinge end t of the lifting support frame 13 at the bottom horizontally, that is, the length of the third straight side z changes, so that the first hinge end s of the lifting support frame 13 at the top moves vertically, that is, the length of the second straight side y changes. The relationship between the length of the third straight side z and the length of the second straight side y is expressed as Equation (1): Equation (1): , where , , and are all greater than 0.

[0035] Since the heating device can measure the first resistance value of its moving end before movement and the second resistance value after movement from the sliding rheostat 3, that is, the difference between the first resistance value and the second resistance value (i.e., r1-r2) is reflected as the difference (z1-z2) when the length of the third straight side z changes. Combined with the fact that the length of the first straight side x is a fixed value, the distance difference of the second straight side y can be calculated by substituting into equation (1), that is, the actual moving distance of the first hinge end s of the lifting support frame 13 pushing the tray during the process of rising or falling is calculated, so as to realize the actual distance of the tray rising or falling in the vertical direction by measuring the resistance value of the sliding rheostat 3.

[0036] Furthermore, in some embodiments, the lifting support frame 13 includes a driven guide sleeve 14 that is connected to the driving member 12. The outer side of the driving member 12 is provided with a first transmission structure 121, and the driven guide sleeve 14 is provided with a second transmission structure 140 for connecting to the first transmission structure 121. More specifically, the driven guide sleeve 14 is assembled from an upper locking cover 143 and a lower locking cover 144. The first transmission structure 121 is threaded onto the outer surface of the driving member 12, and the second transmission structure 140 is threaded onto the upper locking cover 14. 3. During assembly with the lower locking cover 144, the first transmission structure 121 of the driving member 12 first engages with a portion of the second transmission structure 140 of the lower locking cover 144. Then, the upper locking cover 143 is used to fasten the driving member 12 between the upper locking cover 143 and the lower locking cover 144, so that the upper locking cover 143 and the lower locking cover 144 form a complete second transmission structure 140, and the second transmission structure 140 engages with the first transmission structure 121 to form a threaded transmission relationship. Preferably, the first transmission structure 121 is an external thread structure, and the second transmission structure 140 is a threaded transmission structure. Structure 140 is preferably an internal thread structure adapted to the first transmission structure 121. The upper locking cover 143 can be installed on the lower locking cover 144 using any detachable connection structure such as snap-fit ​​connection, screw connection, or plug-in connection. Preferably, screws are used to pass through the upper locking cover 143 and lock the upper locking cover 143 to the lower locking cover 144 to prevent the upper locking cover 143 from loosening during the operation of the mechanism. When maintenance, replacement, or disassembly is required, the upper locking cover 143 can be removed by loosening the screws. In this embodiment, a detachable upper locking cover 143 is used in the transmission mechanism 1. The lower locking cover 144 forms a second transmission structure 140 and a driven guide sleeve 14. After assembly, the driven guide sleeve 14 can drive the driving member 12 to achieve the transmission function required for lifting. When maintenance is required, the upper locking cover 143 can be removed from the lower locking cover 144 to open the driven guide sleeve 14, thereby separating the cooperation between the driving member 12 and the driven guide sleeve 14. This facilitates cleaning or replacing the disassembled parts according to the maintenance situation, and also facilitates the smooth assembly of the driven guide sleeve 14 without removing the driving member 12, which is convenient for production assembly and maintenance replacement.

[0037] Furthermore, in some embodiments, the driving member 12 is a transmission screw, the first transmission structure 121 is an external thread structure, and the second transmission structure 140 is an internal thread structure adapted to the first transmission structure 121. The first transmission structure 121 includes a positive thread a extending from the middle toward the side close to the driver 2 and a negative thread b extending from the middle toward the side away from the driver 2. Driven guide sleeve 14 includes a first guide sleeve 141 and a second guide sleeve 142 respectively disposed on the positive thread a and the negative thread b. Lifting support frame 13 includes a first support frame 131 and a second support frame 132 respectively disposed on the first guide sleeve 141 and the second guide sleeve 142. The first guide sleeve 141 and the second guide sleeve 142 are symmetrically arranged at the middle of the first transmission structure 121. The driver 2 drives the active component 12 to bring the first guide sleeve 141 and the second guide sleeve 142 closer to each other, so that the bottoms of the first support frame 131 and the second support frame 132 are close to each other and the tray descends in the vertical direction. The driver 2 drives the active component 12 to move the first guide sleeve 141 and the second guide sleeve 142 away from each other, so that the bottoms of the first support frame 131 and the second support frame 132 move away from each other and the tray rises in the vertical direction. More specifically, when the output end of the driver 2 rotates forward, the driving member 12 drives the first guide sleeve 141 and the second guide sleeve 142 to move closer to each other via threaded transmission. When the driving member 12 rotates forward, the first guide sleeve 141 moves towards the center of the driving member 12 via the positive thread a, while the second guide sleeve 142 moves towards the center of the driving member 12 via the negative thread b, thus forming the action of the first guide sleeve 141 and the second guide sleeve 142 moving closer to each other. More specifically, when the output of the driver 2 reverses, the drive member 12 uses threaded transmission to drive the first guide sleeve 141 and the second guide sleeve 142 away from each other. When the drive member 12 reverses, the first guide sleeve 141 is driven away from the center of the drive member 12 through the positive thread a, and the second guide sleeve 142 is driven away from the center of the drive member 12 through the negative thread b. This achieves the same result in different driven guide sleeves 14 moving in opposite directions in a single transmission through the positive and negative threads, so as to adapt to the power transmission and force balance of the lifting support frame 13 at the bottom of the pallet.

[0038] Furthermore, in some embodiments, the fixing frame 11 is equipped with a guide shaft 15 for limiting the movement direction of the driven guide sleeve 14, the guide shaft 15 passing through the driven guide sleeve 14 and parallel to the transmission direction of the driving member 12; Driven guide sleeve 14 includes upper locking cover 143 and lower locking cover 144. Upper locking cover 143 is detachably mounted on lower locking cover 144 to form a second transmission structure 140 for cooperating with and connecting the first transmission structure 121. Two guide shafts 15 pass through the two sides of the lower locking cover 144 respectively, and the driving member 12 is located between the two guide shafts 15. More specifically, to further improve the motion stability and force balance of the lifting support frame 13 during the lifting process, the fixed frame 11 is equipped with a guide shaft 15 to limit the movement direction of the driven guide sleeve 14. The guide shaft 15 can help maintain the force balance of the lifting support frame 13 during the lifting process. The guide shaft 15 passes through the driven guide sleeve 14 and is parallel to the transmission direction of the driving member 12. The driver 2 drives the driving member 12 to drive the driven guide sleeve 14 to move back and forth along the axial direction of the guide shaft 15, so that the lifting support frame 13 drives the pallet to rise or fall in the vertical direction. The lifting support frame 13 receives the axial push of the driving member 12 through the driven guide sleeve 14, which can improve the maintenance convenience and flexibility of the lifting support frame 13. The driven guide sleeve 14 plays the role of power transfer and transmission and cooperates with the guide shaft 15.

[0039] More specifically, to further improve the motion stability and force balance of the lifting support frame 13 during the lifting process, the guide shaft 15 includes a first guide shaft and a second guide shaft respectively disposed on the fixed frame 11. The two guide shafts 15 pass through both sides of the lower locking cover 144. The active member 12 is located between the two guide shafts 15. The distance between the active member 12 and the first guide shaft is equal to the distance between the active member 12 and the second guide shaft. By distributing the first guide shaft and the second guide shaft on the radial sides of the active member 12 respectively, the center of gravity of power transmission is placed in the middle of the mechanism, which can further improve the stability and reliability of the lifting support frame 13 during the lifting process and avoid uneven force distribution on one side from the structural layout.

[0040] Furthermore, in some embodiments, the mounting bracket 11 is provided with a micro switch 4 triggered by the driven guide sleeve 14. The micro switch 4 is electrically connected to the driver 2. The micro switch 4 is located at a first position c when the tray is raised to the highest position and a second position d when the tray is lowered to the lowest position. When the driven guide sleeve 14 moves, it drives the moving end of the sliding rheostat 3. The micro switch 4 is located at the first position c when the tray is raised to the highest position and the second position d when the tray is lowered to the lowest position. The micro switch 4 is electrically connected to the driver via the heating device. Device 2 is used to trigger the forward and reverse switching of driver 2. When driven guide sleeve 14 moves, it drives the moving end of sliding rheostat 8. By setting micro switch 4 at the two extreme positions of the lifting distance, driver 2 can trigger limit protection when the tray moves to the highest and lowest limits. This prevents the bottom of lifting support frame 13 from exceeding the transmission stroke of active member 12 and thus failing to reset, prevents driven guide sleeve 14 from exceeding the transmission range of first transmission structure 121 and thus failing to reset, and prevents driven guide sleeve 14 moving in opposite directions from colliding and interfering in the middle of active member 12. This is beneficial to improving the stability and reliability of lifting structure operation.

[0041] Furthermore, in some embodiments, the lifting support frame 13 is hinged between the driven guide sleeve 14 and the pallet. The lifting support frame 13 includes connecting rods 133 for rigid support and reinforcing plates 134 fixedly connected between the connecting rods 133. The driver 2 drives the driving member 12 to drive the driven guide sleeve 14, so that the lifting support frame 13 drives the pallet to rise or fall vertically. More specifically, the lifting support frame 13 uses connecting rods 133 respectively hinged to the bottom of the pallet and the transmission structure of the driving member 12, forming a connecting rod drive structure that can drive the pallet to move up and down. The lifting support frame 13 uses multiple connecting rods 133 respectively abutting against the bottom of the pallet, which simultaneously provide support and bear force during driving. In order to enable adjacent connecting rods 133 to move synchronously, reinforcing plates 134 are used to fix the connecting rods 133 with the same direction of movement and adjacent connecting rods 133. Known processes such as welding, riveting, and integral molding can be used to fix the connecting rods 133 and reinforcing plates 134. The preferred method for fixed connection is to integrally form the reinforcing plate 134 and the connecting rod 133, which can reduce the number of parts and assembly time, thereby reducing production difficulty and production cost. At this time, the adjacent connecting rods 133 form an integral structure that can move synchronously through the reinforcing plate 134. During the lifting movement, the driver 2 drives the active component 12 to drive the connecting rods 133 of the lifting support frame 13 to transmit power, so that the lifting support frame 13 drives the tray to rise or fall vertically in a horizontal position. Since the adjacent connecting rods 133 can achieve synchronous movement with rigid support through the reinforcing plate 134, it avoids uneven force on one side during the lifting and pressing or lowering process of the connecting rods 133, effectively improving the movement stability of the lifting structure during the lifting process of the tray, outputting a powerful and uniform pressing force for steak cooking, which is conducive to further uniform heating of the steak, and is less likely to cause the steak to tilt or deviate during the lifting process, thus improving the cooking quality and cooking effect of the heating equipment.

[0042] Example 2 Figures 1 to 13 This embodiment provides a heating device that can identify the thickness of food ingredients, including an upper tray 51 and a lower tray 52 for heating food ingredients. A cooking cavity 53 for placing food ingredients is provided between the upper tray 51 and the lower tray 52. ​​An automatic lifting structure is installed at the bottom of the lower tray 52, which can determine the separation distance between the upper tray 51 and the lower tray 52 based on the resistance change of the sliding rheostat 3 when the lower tray 52 rises to the highest position.

[0043] Specifically, in this embodiment, the upper tray 51 is a tray structure used by the heating device to press and heat food in conjunction with the lower tray 52, and the lower tray 52 is a tray structure used by the heating device to support food and press and heat food in conjunction with the upper tray 51. The transmission mechanism 1 and the driver 2 are located on the fixed frame 11 below the lower tray 52. More specifically, when the output of the driver 2 rotates forward, the driving member 12 uses a threaded drive to bring the first guide sleeve 141 and the second guide sleeve 142 closer together. Specifically, when the driving member 12 rotates forward, the first guide sleeve 141 moves towards the center of the driving member 12 via the positive thread a, while the second guide sleeve 142 moves towards the center of the driving member 12 via the negative thread b, creating the action of the first guide sleeve 141 and the second guide sleeve 142 moving closer together. Affected by the movement of the bottom of the lifting support frame 13, the lower tray 52 moves downward vertically via the top of the lifting support frame 13. Figure 3 As shown, the first guide sleeve 141 drives the moving end of the sliding rheostat 3, causing the internal resistance of the sliding rheostat 3 to change. By measuring the internal resistance of the sliding rheostat 3, the distance the lower tray 52 moves down in the vertical direction can be calculated by combining formula (1). More specifically, when the output of the driver 2 reverses, the driving member 12 uses threaded transmission to drive the first guide sleeve 141 and the second guide sleeve 142 away from each other. Specifically, when the driving member 12 reverses, the positive thread a drives the first guide sleeve 141 away from the center of the driving member 12, while the negative thread b drives the second guide sleeve 142 away from the center of the driving member 12, creating a movement where the first guide sleeve 141 and the second guide sleeve 142 move away from each other. Influenced by the movement of the bottom of the lifting support frame 13, the lower tray 52 rises vertically via the top of the lifting support frame 13. Figure 4 As shown, the first guide sleeve 141 drives the moving end of the sliding rheostat 3, causing the internal resistance of the sliding rheostat 3 to change. By measuring the internal resistance of the sliding rheostat 3, the distance the lower tray 52 rises in the vertical direction can be calculated by combining the above formula (1).

[0044] Furthermore, in some embodiments, a base 54 for mounting an automatic lifting structure and a flip cover 55 for mounting an upper tray 51 are also included. The base 54 is the bottom structure of the heating device's outer casing, and the flip cover 55 is the top structure of the heating device's outer casing. The flip cover 55 is hinged to the base 54 to form an openable and closable structure for the heating device. When closed, the heating device forms a closed cooking space. The upper tray 51 is mounted on the upper heating surface of the flip cover 55 near the cooking cavity 53, and the lower tray 52 is mounted on the lower heating surface of the base 54 near the cooking cavity 53. The upper and lower heating surfaces are arranged parallel to each other. The upper and lower heating surfaces are respectively provided with raised anti-slip textures. The upper tray 51 and lower tray 52 are respectively equipped with features for raising the heating surfaces. The heating element can be a heating tube, heating wire, heating film, or other heating structure. To better detect the pressure and location of the food, a pressure sensor 56 is installed between the upper tray 51 and the flip cover 55. The pressure sensor 56 is electrically connected to the driver 2. Several pressure sensors 56 are symmetrically distributed in the middle of the tray 51 near the corners of the cooking cavity 53. This multi-point distribution of sensors improves detection accuracy. By collecting and comparing the pressure values ​​fed back by all the pressure sensors 56, the position of the food being clamped on the tray or the pressure of the food can be determined, so that the heating equipment can cook the food according to the preset pressure value and preset clamping time.

[0045] Furthermore, in some embodiments, the flip cover 55 is hinged to the base 54 via a rotational self-locking structure 6. The rotational self-locking structure 6 includes a self-locking fixing block 61 that limits the mounting base 54 and a push-button rotating shaft 62 that limits the mounting on the flip cover 55. The self-locking fixing block 61 has a locking hole 611 into which the push-button rotating shaft 62 extends. The locking hole 611 is provided with a positioning recess 612 for limiting the rotational position of the push-button rotating shaft 62. The surface of the push-button rotating shaft 62 has a positioning protrusion 621 for engaging with the positioning recess 612. After the push-button pivot 62 extends into the lock hole 611, it engages with the positioning recess 612 through the positioning protrusion 621 to lock the relative rotational position between itself and the lock hole 611. Alternatively, the push-button pivot 62 may be displaced by external force, causing the positioning protrusion 621 to disengage from the positioning recess 612 to unlock the relative rotational position between itself and the lock hole 611.

[0046] Specifically, in this embodiment, the base 54 is a fixed base structure for the heating device to be hinged and installed, and the flip cover 55 is a hinged flip cover structure for the heating device. The heating cavity structure of the heating device for cooking and placing food is installed on the base 54. The flip cover 55 flips relative to the base 54 by rotating the self-locking structure 6 to open or close the heating cavity structure of the heating device. The self-locking fixing block 61 is fixedly installed on the base 54 by screws, so that the self-locking fixing block 61 will not move synchronously with the flip cover 55 when it rotates. The push-button pivot 62 extends into the flip cover 55 at a position that restricts the rotation, so that the flip cover 55 can drive the push-button pivot 62 to move synchronously when it rotates. When the flip cover 55 is opened, the push-button pivot 62 rotates relative to the lock hole 611 until the positioning protrusion 621 engages with the positioning recess 612, locking the relative rotational position between the push-button pivot 62 and the lock hole 611, thus locking the rotational position of the flip cover 55 and preventing it from moving. Preferably, the position where the flip cover 55 rotates 90 degrees or 180 degrees relative to the base 54 is set as the locked position. When it is necessary to unlock to restore the rotation of the flip cover 55, the push-button pivot 62 is displaced by external pressing (such as pressing with the user's finger) until the positioning protrusion 621 disengages from the positioning recess 612, thereby releasing the lock on the relative rotational position between the push-button pivot 62 and the lock hole 611, allowing the flip cover 55 to continue to move.

[0047] In this embodiment, a rotational self-locking structure 6 is used between the base 54 and the flip cover 55 to position and lock the opening of the flip cover 55. When the flip cover 55 is opened and rotates relative to the base 54, the positioning protrusion 621 of the push-button pivot 62 engages with the positioning recess 612 of the self-locking block 61 to enter the self-locking state, thereby locking the relative rotational position between the flip cover 55 and the base 54. The open posture of the flip cover 55 remains in the locked position. The user can also operate the push-button pivot 62 by pressing to disengage the positioning protrusion 621 from the positioning recess 612, thereby unlocking the relative rotational position between the flip cover 55 and the base 54. The flip cover 55 returns to the unlocked state where it can be flipped open and closed. After the user opens the flip cover 55, the self-locking effect of the flip cover 55 after being opened and rotated can be achieved without the user's hand support, making it convenient for the user to cook or take out food after opening the flip cover 55, thus improving the convenience of product use.

[0048] Furthermore, in some embodiments, a connecting sleeve 64 for limiting the transition is installed between the push-button pivot 62 and the flip cover 55. The connecting sleeve 64 plays a role in the synchronous transmission between the push-button pivot 62 and the flip cover 55. The inner wall of the sleeve mounting hole in the flip cover 55 into which the connecting sleeve 64 extends has a first limiting surface for limiting the rotational position of the connecting sleeve 64. The side of the connecting sleeve 64 that extends into the sleeve mounting hole has a second limiting surface for engaging with the first limiting surface. The inner wall of the pivot mounting hole in the connecting sleeve 64 into which the push-button pivot 62 extends has a third limiting surface for limiting the rotational position of the push-button pivot 62. The outer side of the end of the push-button pivot 62 that extends into the pivot mounting hole has... The fourth limiting surface is used to cooperate with the third limiting surface. The first, second, third and fourth limiting surfaces are preferably planar structures, which are easy to process. In addition, the first limiting surface is preferably symmetrically arranged on the inner wall of the bushing mounting hole with the hole axis of the bushing mounting hole. The second limiting surface is preferably symmetrically arranged on the outer surface of the adapter bushing 64 with the central axis of the adapter bushing 64. The third limiting surface is preferably symmetrically arranged on the inner wall of the rotating shaft mounting hole with the hole axis of the rotating shaft mounting hole. The fourth limiting surface is preferably symmetrically arranged on the outer surface of the push spring rotating shaft 62 with the central axis of the push spring rotating shaft 62, forming a limiting surface structure that is symmetrical and parallel on both sides, which helps to stabilize the power transmission during rotational transmission.

[0049] Furthermore, in some embodiments, a reset elastic element 63 for axial elastic ejection and reset is provided between the push-button pivot 62 and the adapter sleeve 64. The reset elastic element 63 preferably adopts a cylindrical helical spring structure. The pivot mounting hole has a receiving cavity for accommodating the reset elastic element 63. The reset elastic element 63 is placed in the receiving cavity, which limits the deformation range of the reset elastic element 63, preventing the reset elastic element 63 from coming out or the elastic force from expanding outward. The push-button pivot 62 has a reset protrusion 622 for cooperating with the reset elastic element 63 between the positioning protrusion 621 and the fourth limiting surface. After the push-button pivot 62 is pressed by an external force, causing the positioning protrusion 621 to disengage from the positioning recess 612, the reset elastic element 63 elastically presses against the reset protrusion 622, so that after the push-button pivot 62 is reset, the positioning protrusion 621 is locked back into the positioning recess 612, forming a self-locking effect that does not depend on external force.

[0050] Furthermore, in some embodiments, one end of the push-button pivot 62 is provided with a pressing surface h for the user to contact and apply pressure, the positioning protrusion 621 is located between the pressing surface h and the reset protrusion 622, the lock hole 611 is a hollow through structure, and the flip cover hinge structure has a self-locking state and an unlocking state. In the self-locking state, the reset elastic element 63 presses against the reset protrusion 622 so that the pressing surface h passes through the lock hole 611, and the positioning protrusion 621 is engaged with the positioning recess 612 to lock the relative rotational position between the self-locking fixing block 61 and the pressing spring rotating shaft 62. In the unlocked state, the pressing surface h is pressed by an external force, causing the press spring shaft 62 to move toward the shaft mounting hole, and the positioning protrusion 621 disengages from the positioning recess 612 to unlock the relative rotational position between the self-locking fixing block 61 and the press spring shaft 62.

[0051] Furthermore, in some embodiments, the positioning recess 612 includes a first recess 6121, a second recess 6122, and a third recess 6123 arranged at intervals. The first recess 6121, the second recess 6122, and the third recess 6123 correspond to the self-locking positions of the flip cover 55 in different rotational postures. When the first recess 6121 is located in the initial position where the flip cover 55 is not opened, it corresponds to the first position e where the positioning protrusion 321 is located, forming a self-lock when the flip cover 55 is in the closed state. When the second recess 6122 is located in the second position f where the positioning protrusion 321 is located when the flip cover 55 is opened from the initial position relative to the base 54 and rotates 90 degrees, it corresponds to the second position f where the positioning protrusion 321 is located, forming a self-lock after the flip cover 55 is initially opened. When the third recess 6123 is located in the third position g where the positioning protrusion 321 is located when the flip cover 55 is opened from the initial position relative to the base 54 and rotates 180 degrees, it corresponds to the third position g where the positioning protrusion 321 is located, forming a self-lock after the flip cover 55 is fully opened. Users can choose to use different locking positions according to the cooking situation or the placement of surrounding items.

[0052] Furthermore, in some embodiments, the base 54 and the flip cover 55 are both provided with internal circuit structures. To solve the problem of circuit layout where the base 54 passes through the hinge structure to connect to the flip cover 55, the flip cover 55 is also hinged to the base 54 via a rotating wiring structure 7. The base 54 includes a first hinge portion 541 and a second hinge portion 542, which are respectively disposed on both axial sides of the hinge position and coaxially arranged. A rotating self-locking structure 6 is installed on the first hinge portion 541, and the rotating wiring structure 7 is installed on the second hinge portion 542. The first circuit chamber 540 of the base 54 for accommodating electronic components is connected to the second circuit chamber 550 of the flip cover 55 for accommodating electronic components via the rotating wiring structure 7. The rotating wiring structure 7 includes a limiting installation. The base 54 has a wire-passing fixing block 71 and a wire-passing bushing 72 that is limited and installed on the flip cover 55. The side wall of the wire-passing fixing block 71 has a wire-passing opening 711 for the cable to pass through, and the wire-passing bushing 72 has a hollow through-hole 721 for the cable to pass through. The first circuit chamber 540 has a first wire-passing cavity j for wire passing, and the second circuit chamber 550 has a second wire-passing cavity k for wire passing. The internal circuit structure of the first circuit chamber 540 is connected to the internal circuit structure of the second circuit chamber 550 through the first wire-passing cavity j, the wire-passing opening 711, the wire-passing hole 721, and the second wire-passing cavity k. This reduces the twisting or pulling effect on the internal circuit cable connection when the flip cover 55 is opened and rotated.

[0053] Furthermore, in some embodiments, the first hinge portion 541 and the second hinge portion 542 are horizontally symmetrically arranged at the center of the base 54. A transition sleeve 64 for limiting the transition is installed between the spring-loaded pivot 62 and the flip cover 55. The self-locking fixing block 61 and the wire-passing fixing block 71 have the same structure and are symmetrically arranged at the first hinge portion 541 and the second hinge portion 542. The transition sleeve 64 and the wire-passing sleeve 72 have the same structure and are symmetrically arranged at the first hinge portion 541 and the second hinge portion 542. The two first wire-passing cavities j are horizontally symmetrically arranged at the center of the first circuit chamber 540. The symmetrically arranged hinge structure further improves the force balance on both sides of the flip cover 55 during rotation, avoiding the shaking or tipping of the equipment caused by unilateral force.

[0054] Furthermore, in some embodiments, a sealing ring 73 for enhancing the sealing effect is installed between the rotating self-locking structure 6 and the first hinge portion 541, and a sealing ring 73 for enhancing the sealing effect is also installed between the rotating wire-passing structure 7 and the first hinge portion 541. The rotating self-locking structure 6 includes a first sealing end cap 543 installed on the first hinge portion 541 for enhancing the sealing effect, and the rotating wire-passing structure 7 includes a second sealing end cap 544 installed on the second hinge portion 542 for enhancing the sealing effect. The pressing surface h of the push-button pivot 62, which allows the user to contact and apply pressure, passes through and is exposed on the first sealing end cap 543. By using the sealing ring 73 to seal the hinge position, it can effectively prevent impurities such as moisture and oil fumes generated during cooking or external moisture and oil fumes from entering the internal circuit structure, avoiding adverse effects on the electrical control part of the equipment, and helping to improve the airtight isolation effect between the overall hinge structure and the outside or the internal cooking chamber.

[0055] Example 3 This embodiment provides a method for identifying the thickness of food ingredients, applicable to heating equipment with an automatic lifting structure. The heating equipment has a pressure sensor 56 installed on the upper tray 51 and a transmission mechanism 1 installed on the lower tray 52. ​​The transmission mechanism 1 is equipped with a lifting support frame 13, a driver 2 for driving the lifting support frame 13, and a sliding rheostat 3 driven by the lifting support frame 13. The method includes: In the unloaded state, the transmission mechanism 1 drives the lower tray 52 to rise until it contacts the upper tray 51, thereby triggering the pressure sensor 56; The heating device obtains the first resistance value from the sliding rheostat 3; Under load, the transmission mechanism 1 drives the lower tray 52 to rise so that the food contacts the upper tray 51, thereby triggering the pressure sensor 56. When the lower tray 52 rises, the driver 2 drives the bottom position of the lifting support frame 13 to move laterally, and the bottom position of the lifting support frame 13 drives the moving end of the sliding rheostat 3. The heating device obtains the second resistance value from the sliding rheostat 3; The first height position of the lower tray 52 when the pressure sensor 56 is triggered under no-load conditions is determined based on the first resistance value of the sliding rheostat 3, and the second height position of the lower tray 52 when the pressure sensor 56 is triggered under load conditions is determined based on the second resistance value of the sliding rheostat 3. The thickness of the food under load is obtained by calculating the difference between the first height position and the second height position.

[0056] Specifically, in this embodiment, the sliding rheostat is a circuit element that changes its resistance value by changing the position of its moving end, thereby determining the position of the moving end by measuring the resistance value. To identify the thickness of the food during the cooking process, this embodiment calculates the moving distance of the tray by measuring the resistance change of the sliding rheostat. When the lifting support frame 13 moves the tray vertically upwards or downwards, it moves the moving end of the sliding rheostat 3 within its measured stroke. The change in position of the moving end of the sliding rheostat 3 causes a change in its internal resistance. The heating device can calculate the actual distance the tray moves vertically by measuring the resistance of the sliding rheostat 3. Figures 3 to 5 For example, the straight-line distance between the center of the first hinge end s of the lifting support frame 13 and the center of the second hinge end t of the lifting support frame 13 forms the first straight side x; the straight-line distance between the center of the first hinge end s of the lifting support frame 13 and the central axis of the driving member 12 forms the second straight side y; and the straight-line distance between the center of the second hinge end t of the lifting support frame 13 and the second straight side y forms the third straight side z. The first straight side x, the second straight side y, and the third straight side z form a right-angled triangle relationship that can express the movement and change of the three. Here, the first straight side x is the inclined straight side in the right-angled triangle relationship, the second straight side y is the vertical straight side in the right-angled triangle relationship, and the third straight side z... Side z is the horizontal straight side in the right triangle relationship. Since the first hinge end s and the second hinge end t of the lifting support frame 13 are located at the beginning and end of the connecting rod 133 of the lifting support frame 13 in the length direction, the length of the connecting rod 133 is fixed, that is, the length of the first straight side x is also a fixed value. When the driver 2 drives the active member 12 to move the second hinge end t of the lifting support frame 13 at the bottom horizontally, that is, the length of the third straight side z changes, so that the first hinge end s of the lifting support frame 13 at the top moves vertically, that is, the length of the second straight side y changes. The relationship between the length of the third straight side z and the length of the second straight side y is expressed as Equation (1): Equation (1): , where , , and are all greater than 0.

[0057] Since the heating device can measure the first resistance value of its moving end before movement and the second resistance value after movement from the sliding rheostat 3, that is, the difference between the first resistance value and the second resistance value (i.e., r1-r2) is reflected as the difference (z1-z2) when the length of the third straight side z changes. Combined with the fact that the length of the first straight side x is a fixed value, the distance difference of the second straight side y can be calculated by substituting into equation (1), that is, the actual moving distance of the first hinge end s of the lifting support frame 13 pushing the tray during the process of rising or falling is calculated, so as to realize the actual distance of the tray rising or falling in the vertical direction by measuring the resistance value of the sliding rheostat 3.

[0058] Furthermore, in some embodiments, the driver 2 drives the bottom position of the lifting support frame 13 to move laterally via the driving member 12 through a threaded transmission. The lifting support frame 13 is driven by the driving member 12 through the driven guide sleeve 14, and the moving end of the sliding rheostat 3 is driven by the driven guide sleeve 14. The transmission mechanism 1 also includes a micro switch 4 for feedback of the travel limit position. The micro switch 4 is located at the first position c when the tray rises to the highest position and the second position d when the tray falls to the lowest position. When the driven guide sleeve 14 moves, it drives the moving end of the sliding rheostat 3. The method includes: In the no-load state, when the lower tray 52 rises to the highest position, the driven guide sleeve 14 triggers the micro switch 4 in the first position c, thereby triggering the output terminal of the driver 2 to reverse, or triggering the heating device to collect the sliding rheostat 3 to obtain the third resistance value; When the lower tray 52 descends to its lowest position, the driven guide sleeve 14 triggers the micro switch 4, which is in the second position d, thereby triggering the output of the driver 2 to reverse, or triggering the heating device to collect the fourth resistance value from the sliding rheostat 3. The third height position of the lower tray 52 when it is at its highest position is determined according to the third resistance value of the sliding rheostat 3, and the fourth height position of the lower tray 52 when it is at its lowest position is determined according to the fourth resistance value of the sliding rheostat 3. The maximum distance between the upper pallet 51 and the lower pallet 52 under no-load conditions is obtained by calculating the difference between the third height position and the fourth height position. The maximum lifting distance of the lower pallet 52 under load is obtained by calculating the difference between the second and fourth height positions. The thickness of the food under load is obtained by calculating the difference between the maximum interval distance and the maximum rise distance.

[0059] The above examples are merely illustrative of the technical content of the present invention to facilitate easier understanding by the reader, but do not imply that the implementation of the present invention is limited to these examples. Any technical extensions or re-creations made based on the present invention are protected by the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An automatic lifting structure capable of measuring movement distance, comprising a transmission mechanism (1) for moving a pallet and a driver (2) for driving the transmission mechanism (1), the transmission mechanism (1) comprising a fixed frame (11) for mounting the driver (2), an active member (12) mounted on the fixed frame (11 and driven by the output end of the driver (2), and a lifting support frame (13) driven by the active member (12) and movably connected to the bottom of the pallet, characterized in that: The fixed frame (11) is equipped with a sliding rheostat (3). The driver (2) drives the bottom position of the lifting support frame (13) to move laterally and drives the top position of the lifting support frame (13) to move the tray vertically. When moving, the bottom position of the lifting support frame (13) drives the moving end of the sliding rheostat (3). The distance that the lifting support frame (13) drives the tray to move can be determined according to the resistance change of the sliding rheostat (3).

2. The automatic lifting structure capable of measuring moving distance as described in claim 1, characterized in that: The lifting support frame (13) includes a driven guide sleeve (14) that is connected to the driving member (12). The outer side of the driving member (12) is provided with a first transmission structure (121), and the driven guide sleeve (14) is provided with a second transmission structure (140) for connecting to the first transmission structure (121).

3. The automatic lifting structure capable of measuring movement distance as described in claim 2, characterized in that: The active component (12) is a transmission screw, the first transmission structure (121) is an external thread structure, and the second transmission structure (140) is an internal thread structure adapted to the first transmission structure (121). The first transmission structure (121) includes a positive thread a extending from the middle toward the side close to the driver (2) and a negative thread b extending from the middle toward the side away from the driver (2). The driven guide sleeve (14) includes a first guide sleeve (141) and a second guide sleeve (142) respectively disposed on the positive thread a and the negative thread b. The lifting support frame (13) includes a first support frame (131) and a second support frame (132) respectively disposed on the first guide sleeve (141) and the second guide sleeve (142). The first guide sleeve (141) and the second guide sleeve (142) are symmetrically arranged with respect to the middle part of the first transmission structure (121). The driver (2) drives the active component (12) to bring the first guide sleeve (141) and the second guide sleeve (142) closer to each other, so that the bottoms of the first support frame (131) and the second support frame (132) are close to each other and the tray descends in the vertical direction; The driver (2) drives the active component (12) to move the first guide sleeve (141) and the second guide sleeve (142) away from each other, so that the bottoms of the first support frame (131) and the second support frame (132) move away from each other and the tray rises in the vertical direction.

4. The automatic lifting structure capable of measuring moving distance as described in claim 2, characterized in that: The fixed frame (11) is provided with a micro switch (4) triggered by the driven guide sleeve (14). The micro switch (4) is electrically connected to the driver (2). The micro switch (4) is located at the first position c when the tray rises to the highest position and the second position d when the tray falls to the lowest position. When the driven guide sleeve (14) moves, it drives the moving end of the sliding rheostat (3).

5. A heating device capable of identifying the thickness of food ingredients, characterized in that: It includes an upper tray (51) and a lower tray (52) for heating food, respectively. There is a cooking cavity (53) for placing food between the upper tray (51) and the lower tray (52). The bottom of the lower tray (52) is equipped with an automatic lifting structure as described in any one of claims 1-4, which can determine the separation distance between the upper tray (51) and the lower tray (52) based on the resistance change of the sliding rheostat (3) when the lower tray (52) rises to the highest position.

6. The heating device for recognizing the thickness of food ingredients as described in claim 5, characterized in that: It also includes a base (54) for mounting the automatic lifting structure and a flip cover (55) for mounting the upper tray (51). A pressure sensor (56) for detecting the pressure on the food is installed between the upper tray (51) and the flip cover (55). The pressure sensor (56) is electrically connected to the driver (2). Several pressure sensors (56) are symmetrically arranged at the corners of the upper tray (51) near the corners of the cooking cavity (53).

7. A heating device capable of identifying the thickness of food ingredients as described in claim 5, characterized in that: The flip cover (55) is hinged to the base (54) by a rotational self-locking structure (6). The rotational self-locking structure (6) includes a self-locking fixing block (61) that is fixed on the base (54) and a push-button pivot (62) that is fixed on the flip cover (55). The self-locking fixing block (61) has a locking hole (611) into which the push-button pivot (62) extends. The locking hole (611) is provided with a positioning recess (612) for limiting the rotation position of the push-button pivot (62). The surface of the push-button pivot (62) has a positioning protrusion (621) for cooperating with the positioning recess (612). After the push-button pivot (62) extends into the lock hole (611), it engages with the positioning recess (612) through the positioning protrusion (621) to lock the relative rotational position between itself and the lock hole (611), or the push-button pivot (62) is displaced by external force, causing the positioning protrusion (621) to disengage from the positioning recess (612) to unlock the relative rotational position between itself and the lock hole (611).

8. A heating device capable of identifying the thickness of food ingredients as described in claim 7, characterized in that: The flip cover (55) is also hinged to the base (54) via a rotating wire-passing structure (7). The base (54) includes a first hinge portion (541) and a second hinge portion (542) located on both sides of the hinge position and coaxially arranged. The rotating self-locking structure (6) is installed on the first hinge portion (541), and the rotating wire-passing structure (7) is installed on the second hinge portion (542). The first circuit chamber (540) of the base (54) for accommodating electronic components is connected to the second circuit chamber (550) of the flip cover (55) for accommodating electronic components via the rotating wire-passing structure (7).

9. A method for identifying the thickness of food ingredients, applicable to heating equipment with an automatic lifting structure, characterized in that: The heating device is equipped with a pressure sensor (56) on the upper tray (51) and a transmission mechanism (1) on the lower tray (52). The transmission mechanism (1) is equipped with a lifting support frame (13), a driver (2) for driving the lifting support frame (13), and a sliding rheostat (3) driven by the lifting support frame (13). The method includes: In the unloaded state, the transmission mechanism (1) drives the lower tray (52) to rise to contact the upper tray (51) to trigger the pressure sensor (56). The heating device obtains the first resistance value from the sliding rheostat (3); Under load, the transmission mechanism (1) drives the lower tray (52) to rise so that the food contacts the upper tray (51) to trigger the pressure sensor (56). When the lower tray (52) rises, the driver (2) drives the bottom position of the lifting support frame (13) to move laterally. The bottom position of the lifting support frame (13) drives the moving end of the sliding rheostat (3). The heating device obtains the second resistance value from the sliding rheostat (3); The first height position of the lower tray (52) when the pressure sensor (56) is triggered under no-load conditions is determined according to the first resistance value of the sliding rheostat (3), and the second height position of the lower tray (52) when the pressure sensor (56) is triggered under load conditions is determined according to the second resistance value of the sliding rheostat (3). The thickness of the food under load is obtained by calculating the difference between the first height position and the second height position.

10. A heating device capable of identifying the thickness of food ingredients as described in claim 9, characterized in that: The driver (2) drives the bottom position of the lifting support frame (13) to move laterally through the drive member (12) in a threaded transmission manner. The lifting support frame (13) is driven by the drive member (12) through the driven guide sleeve (14). The moving end of the sliding rheostat (3) is driven by the driven guide sleeve (14). The transmission mechanism (1) also includes a micro switch (4) for feedback of the travel limit position. The micro switch (4) is located at the first position c when the tray rises to the highest position and the second position d when the tray falls to the lowest position. When the driven guide sleeve (14) moves, it drives the moving end of the sliding rheostat (3). The method includes: When the lower tray (52) rises to the highest position under no-load conditions, the driven guide sleeve (14) triggers the micro switch (4) in the first position c, thereby triggering the output of the driver (2) to reverse, or triggering the heating device to collect the sliding rheostat (3) to obtain the third resistance value; When the lower tray (52) descends to the lowest position, the driven guide sleeve (14) triggers the micro switch (4) in the second position d, thereby triggering the output of the driver (2) to reverse, or triggering the heating device to collect the sliding rheostat (3) to obtain the fourth resistance value; The third height position of the lower tray (52) when it is at its highest position is determined by the third resistance value of the sliding rheostat (3), and the fourth height position of the lower tray (52) when it is at its lowest position is determined by the fourth resistance value of the sliding rheostat (3). The maximum distance between the upper pallet (51) and the lower pallet (52) under no-load conditions is obtained by calculating the difference between the third height position and the fourth height position. The maximum lifting distance of the lower pallet (52) under load is obtained by calculating the difference between the second and fourth height positions. The thickness of the food under load is obtained by calculating the difference between the maximum interval distance and the maximum rise distance.

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