Hot air circulation belt dryer

Abstract

The present invention relates to the field of drying technology, and in particular to a hot air circulation belt dryer, comprising a shell, a transmission belt and a power mechanism; the transmission belt is an annular mesh structure; a material storage trough is arranged inside the shell and at the lower side of the left end of the upper side of the transmission belt, the power mechanism is arranged in the shell and causes the transmission belt to move periodically to transport materials, and the action of the transmission belt in each cycle is divided into four stages, in the first stage, the power mechanism drives the upper side of the transmission belt to move leftward, so that the upper side of the transmission belt is partially deformed downward and fits into the material storage trough, so that the transmission belt can quantitatively receive and transport materials, and ensure that the materials are distributed as evenly as possible on the transmission belt; in the second stage, the power mechanism drives the upper side of the transmission belt to move rightward, and brings out the materials stored when the transmission belt fits into the material storage trough; when the transmission belt returns to being straight, the materials are caused to roll; in the third stage, the power mechanism is in an empty stroke; in the fourth stage, the power mechanism drives the upper side of the transmission belt to move rightward.

Description

Technical Field

[0001] The invention relates to the technical field of drying, and in particular to a hot air circulation belt drying machine. Background Art

[0002] The belt dryer is a continuous drying equipment for batch production. It is often used for drying flake, strip, and granular materials with good air permeability. It has the advantages of fast drying speed, high evaporation intensity, and good product quality. The materials are distributed on the conveyor belt and dried by the hot air passing through the conveyor belt, where the conveyor belt is usually made of materials with holes or good air permeability. In order to ensure the drying effect of the materials on the conveyor belt, it is necessary to make the materials as evenly distributed as possible on the conveyor belt. Existing hot air circulation belt dryers usually use an auger to spread the materials flat in the width direction of the conveyor belt, but due to uneven feeding, the materials will be unevenly laid on the conveyor belt, which will cause the materials to accumulate on the conveyor belt, affecting the drying effect of the materials. Summary of the invention

[0003] The invention provides a hot air circulation belt dryer to solve the problem that uneven material feeding leads to uneven laying of materials on a conveyor belt, which affects the drying effect of the materials in the existing dryer.

[0004] A hot air circulation belt dryer of the present invention adopts the following technical solution:

[0005] A hot air circulation belt dryer comprises a shell, a transmission belt and a power mechanism; the transmission belt is an annular mesh structure and is arranged in the shell, the upper side of the transmission belt is horizontal and arranged in the left and right directions; a tensioning structure is arranged between the transmission belt and the shell, and the tensioning structure causes the transmission belt to remain tensioned; an air intake grille, a feed port and a discharge port are arranged on the shell, the air intake grille is arranged above the transmission belt, and a heating structure is arranged on the lower side of the corresponding air intake grille in the shell; the feed port is located above the left end of the transmission belt, and the discharge port is located below the right side of the transmission belt; a storage trough is arranged in the shell and below the left end of the upper side of the transmission belt, and the storage trough is located below the feed port; an extrusion roller group is arranged in the shell and at the upper corner of the left end of the transmission belt, and the extrusion roller group blocks the The power mechanism prevents the transmission belt at that location from moving to the left and allows the transmission belt at that location to move to the right; the power mechanism is arranged in the shell, and makes the transmission belt move periodically to transport materials. In each cycle, the action of the power mechanism on the transmission belt is divided into four stages. In the first stage, the power mechanism drives the upper side of the transmission belt to move to the left, so that the upper side of the transmission belt is partially deformed downward and fits with the storage trough; in the second stage, the power mechanism drives the upper side of the transmission belt to move to the right, and brings out the material stored when the transmission belt fits with the storage trough; in the third stage, the power mechanism is an empty stroke; in the fourth stage, the power mechanism drives the upper side of the transmission belt to move to the right; a material baffle plate is arranged in the shell, and the material baffle plate prevents the material on the transmission belt that falls outside the position where it fits with the storage trough from flowing to the right.

[0006] Optionally, the power mechanism is arranged on the lower side of the upper side of the transmission belt, including a connecting rod unit, a telescopic rod, a sliding block and a toggle piece; the connecting rod unit is a four-link structure hinged end to end, and one side of the connecting rod unit is fixed; the sliding block is slidably installed on the shell along the left and right directions, the telescopic rod slides with the sliding block in the vertical direction and can move left and right synchronously with the sliding block, and is restricted by the sliding block to rotate around the horizontal axis; the telescopic rod is telescopic and has a spring inside; one end of the telescopic rod is hinged to the hinge position of the two freely movable sides of the connecting rod unit, and the other end is hinged to the toggle piece and slidably connected along the left and right directions; the connecting rod unit drives the telescopic rod to reciprocate left and right; the toggle piece is located above the sliding block, and the left and right Electromagnets are installed on both sides; a magnetic block is installed on the inner ring of the transmission belt; the hinge position of the telescopic rod and the toggle piece is between the two electromagnets, and the sliding range of the telescopic rod on the toggle piece is eccentrically set in the left and right directions of the toggle piece; when the telescopic rod moves to the left to the left end of its sliding range, the electromagnet located at the left end of the toggle piece is energized, so that the left side of the toggle piece is adsorbed and fixed to the lower side of the upper side of the transmission belt, and when the telescopic rod continues to move to the left, it drives the toggle piece to flip around its left end; when the telescopic rod moves to the right to the right end of its sliding range, both electromagnets are energized, so that both ends of the toggle piece are adsorbed and fixed to the lower side of the upper side of the transmission belt, and when the telescopic rod continues to move to the right, it drives the upper side of the transmission belt to move synchronously to the right.

[0007] Optionally, the connecting rod unit includes a fixed rod, a short rod, a long rod and a linkage rod, the fixed rod is arranged in the left and right direction and fixed in the outer shell; one end of the short rod and the long rod are respectively hinged to the two ends of the fixed rod, and the two ends of the linkage rod are respectively hinged to the other ends of the short rod and the long rod; the length of the short rod is smaller than that of the long rod and the short rod is located on the right side of the long rod, and the telescopic rod is hinged to the hinge point of the long rod and the linkage rod.

[0008] Optionally, the power mechanism further comprises a motor, which is mounted on the housing and is used to drive the short rod to rotate circumferentially around a hinge point between the short rod and the fixed rod.

[0009] Optionally, the extrusion roller group includes an inner roller and an outer roller, and both the inner roller and the outer roller are rotatably installed on the outer shell around an axis horizontally and perpendicular to the left and right directions; the inner roller is arranged on the inner ring of the transmission belt, and the outer roller is arranged on the outer ring of the transmission belt, and the inner roller and the outer roller are both located on the bisector of the angle at the upper corner of the left end of the transmission belt, and are both in contact with the transmission belt.

[0010] Optionally, a plurality of transmission rollers are arranged in the shell, and the plurality of transmission rollers are rotatably mounted on the shell along an axis horizontally and perpendicular to the left-right direction; the transmission belt is sleeved outside the plurality of transmission rollers and rotates around the plurality of transmission rollers.

[0011] Optionally, the tensioning structure includes an elastic member and a tensioning plate, wherein the tensioning plate is slidably installed in the shell along a vertical direction; the elastic member is arranged between the tensioning plate and the shell, and always has a tendency to cause the tensioning plate to abut against the transmission belt.

[0012] Optionally, a material guide plate is provided in the shell, and the material guide plate is located on the left side of the material baffle plate, and is used for guiding the material entering from the feed inlet to fall onto the transmission belt.

[0013] Optionally, an auger blade is also provided in the shell, which is rotatably mounted on the shell around an axis horizontally and perpendicular to the left and right directions and is located below the right side of the transmission belt to drive the dried material to be discharged from the discharge port.

[0014] Optionally, a hot air circulation belt dryer further includes an exhaust mechanism, which is connected to the bottom of the shell and is used to extract gas containing water vapor inside the shell.

[0015] The beneficial effects of the present invention are as follows: the hot air circulation belt dryer of the present invention cooperates with the transmission belt by arranging a power mechanism so that the transmission belt can quantitatively receive and convey materials, and the size of the material storage trough determines the amount of material conveyed by the transmission belt each time, ensuring that the material is distributed on the transmission belt as evenly as possible, avoiding uneven distribution of materials affecting the drying effect; and the transmission belt is deformed in the first stage, and the transmission belt is restored to straightness in the second stage, so that the material rolls, further improving the drying effect of the material on the transmission belt.

[0016] Furthermore, by setting a connecting rod unit as a power source for driving the telescopic rod to move left and right, the speed of the telescopic rod moving to the right is greater than the speed of moving to the left, thereby further accelerating the rolling of the material on the transmission belt when the transmission belt is stretched in the second stage, further improving the drying effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a hot air circulation belt dryer of the present invention;

[0019] Figure 2 A top view of the overall structure of an embodiment of a hot air circulation belt dryer of the present invention;

[0020] Figure 3 for Figure 2 Schematic diagram of the section along the AA direction;

[0021] Figure 4 It is a schematic diagram of a transmission belt, a transmission roller and a tensioning structure in an embodiment of a hot air circulation belt dryer of the present invention;

[0022] Figure 5 This is a schematic structural diagram of a hot air circulation belt dryer according to an embodiment of the present invention, in which a power mechanism is installed on a housing;

[0023] Figure 6 for Figure 5 The enlarged schematic diagram of point D in the middle;

[0024] Figure 7 It is a front view of a power mechanism installed on a housing in an embodiment of a hot air circulation belt dryer of the present invention;

[0025] Figure 8 for Figure 7 Schematic diagram of the section along the BB direction;

[0026] Fig. 9 for Figure 8 The enlarged schematic diagram of point E in the middle;

[0027] Fig.10 for Figure 7 Schematic diagram of the cross section along the CC direction;

[0028] Fig.11 for Fig.10 The enlarged schematic diagram of F in the middle;

[0029] Fig.12 A schematic diagram of the state of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0030] Fig.13 A second schematic diagram of a state of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0031] Fig.14 The third schematic diagram is a state diagram of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0032] Fig.15 4 is a schematic diagram of the state of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0033] Fig.16 A fifth schematic diagram of the state of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0034] Fig.17 6 is a schematic diagram of the state of a power mechanism in an embodiment of a hot air circulation belt dryer of the present invention;

[0035] In the figure: 100, shell; 110, air intake grille; 120, feed port; 130, discharge port; 140, heating structure; 150, storage trough; 160, extrusion roller group; 161, inner roller; 162, outer roller; 170, transmission roller; 180, baffle plate; 190, guide plate; 200, transmission belt; 300, power mechanism; 310, connecting rod unit; 311, fixed rod; 312, short rod; 313, long rod; 314, linkage rod; 320, telescopic rod; 321, spring; 330, sliding block; 340, toggle member; 341, slide groove; 350, motor; 400, suction mechanism; 500, tensioning structure; 510, elastic member; 520, tensioning plate; 600, auger blade. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] An embodiment of a hot air circulation belt dryer of the present invention is as follows Figures 1 to 11 As shown, it includes a housing 100 , a transmission belt 200 and a power mechanism 300 .

[0038] The transmission belt 200 is an annular mesh structure and is disposed in the housing 100. The upper side of the transmission belt 200 is horizontal and disposed in the left-right direction. A tensioning structure 500 is disposed between the transmission belt 200 and the housing 100, and the tensioning structure 500 causes the transmission belt 200 to remain tensioned.

[0039] The housing 100 is provided with an air intake grille 110, a feed port 120 and a discharge port 130. The air intake grille 110 is provided above the transmission belt 200, and a heating structure 140 is provided in the housing 100 corresponding to the lower side of the air intake grille 110. The heating structure 140 is used to heat the gas entering from the air intake grille 110. The feed port 120 is located above the left end of the transmission belt 200, and the discharge port 130 is located below the right side of the transmission belt 200.

[0040] A material storage trough 150 is provided in the housing 100 and at the lower side of the left end of the upper side of the transmission belt 200, and the material storage trough 150 is located below the feed port 120. A squeezing roller set 160 is provided in the housing 100 and at the upper left corner of the transmission belt 200, and the squeezing roller set 160 prevents the transmission belt 200 from moving to the left and allows the transmission belt 200 to move to the right.

[0041] The power mechanism 300 is arranged in the shell 100, and makes the transmission belt 200 move periodically to transport materials. In each cycle, the action of the power mechanism 300 on the transmission belt 200 is divided into four stages. In the first stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move to the left, so that the upper side of the transmission belt 200 is partially deformed downward and fits with the storage trough 150; in the second stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move to the right, and brings out the material stored when the transmission belt 200 is in contact with the storage trough 150; in the third stage, the power mechanism 300 is an empty stroke; in the fourth stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move to the right.

[0042] A material baffle plate 180 is provided in the outer shell 100, which prevents the material falling from the transmission belt 200 outside the position where it fits with the storage trough 150 from flowing to the right; specifically, the material baffle plate 180 is located above the storage trough 150, and the lower end of the material baffle plate 180 abuts against the upper side of the transmission belt 200, and the abutting position is located above the middle of the storage trough 150.

[0043] When the hot air circulating belt dryer is working, the power mechanism 300 works in the order of the first stage, the second stage, the third stage and the fourth stage in each cycle. In the first stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move to the left. Since the squeezing roller group 160 hinders the transmission belt 200 at the upper corner of the left end of the transmission belt 200 from moving to the left, and a tensioning structure 500 is provided between the transmission belt 200 and the housing 100, the upper side of the transmission belt 200 can partially deform downward and fit with the material storage tank 150, so that a groove is formed in the upper side of the transmission belt 200, and the material entering the feed port 120 falls into the groove of the transmission belt 200. In the second stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move rightward, stretching the transmission belt 200 and taking out the material in the groove, and when the transmission belt 200 is stretched, the material in the groove will roll on the transmission belt 200, which helps to improve the drying effect of the material on the transmission belt 200. In the fourth stage, the power mechanism 300 drives the upper side of the transmission belt 200 to move rightward, so that the transmission belt 200 rotates a certain angle to transport the material to move a certain distance to the right, and can change the contact position of the transmission belt 200 and the storage tank 150 in the next cycle.

[0044] By setting the power mechanism 300 to cooperate with the transmission belt 200, the transmission belt 200 can quantitatively receive and convey materials, and the size of the storage trough 150 determines the amount of material conveyed by the transmission belt 200 each time, ensuring that the material is distributed as evenly as possible on the transmission belt 200 to avoid uneven distribution of materials affecting the drying effect; and the transmission belt 200 is deformed in the first stage, and the transmission belt 200 is restored to straightness in the second stage, so that the material rolls, further improving the drying effect of the material on the transmission belt 200.

[0045] In this embodiment, the power mechanism 300 is arranged at the lower side of the upper side of the transmission belt 200, and includes a connecting rod unit 310, a telescopic rod 320, a sliding block 330 and a toggle member 340; the connecting rod unit 310 is a four-link structure hinged end to end, and one side of the connecting rod unit 310 is fixed. The sliding block 330 is slidably installed on the housing 100 along the left and right directions, and the telescopic rod 320 is slidably matched with the sliding block 330 along the vertical direction and can move left and right synchronously with the sliding block 330, and is restricted by the sliding block 330 to rotate around the horizontal axis. The telescopic rod 320 is telescopic and has a spring 321 inside. One end of the telescopic rod 320 is hinged to the hinge position of the two freely movable sides in the connecting rod unit 310, and the other end is hinged to the toggle member 340 and is slidably connected along the left and right directions. The connecting rod unit 310 drives the telescopic rod 320 to move back and forth left and right. The toggle member 340 is located above the sliding block 330, and electromagnets are installed on the left and right sides of the toggle member 340, and the sides of the two electromagnets that are away from each other are both arc surfaces; a magnetic block is installed on the inner ring of the transmission belt 200; the hinge position of the telescopic rod 320 and the toggle member 340 is between the two electromagnets, and the sliding range of the telescopic rod 320 on the toggle member 340 is eccentrically set on the left and right directions of the toggle member 340; specifically, a slide groove 341 set in the left and right directions is opened in the toggle member 340, and the other end of the telescopic rod 320 is rotatably and slidably installed in the slide groove 341, and the slide groove 341 is eccentrically set relative to the center of the toggle member 340 in the left and right directions. When the telescopic rod 320 moves to the left to the left end of its sliding range, the electromagnet located at the left end of the toggle member 340 is energized, so that the left side of the toggle member 340 is adsorbed and fixed to the lower side of the upper side edge of the transmission belt 200. When the telescopic rod 320 continues to move to the left, the toggle member 340 is driven to flip around its left end; when the telescopic rod 320 moves to the right to the right end of its sliding range, both electromagnets are energized, so that both ends of the toggle member 340 are adsorbed and fixed to the lower side of the upper side edge of the transmission belt 200. When the telescopic rod 320 continues to move to the right, the upper side edge of the transmission belt 200 is driven to move to the right synchronously.

[0046] Among them, the connecting rod unit 310 includes a fixed rod 311, a short rod 312, a long rod 313 and a linkage rod 314. The fixed rod 311 is arranged in the left-right direction and fixed in the shell 100; one end of the short rod 312 and the long rod 313 are respectively hinged to the two ends of the fixed rod 311, and the two ends of the linkage rod 314 are respectively hinged to the other ends of the short rod 312 and the long rod 313; the length of the short rod 312 is smaller than that of the long rod 313 and the short rod 312 is located on the right side of the long rod 313, and the telescopic rod 320 is hinged to the hinge point of the long rod 313 and the linkage rod 314.

[0047] The hinged position of the telescopic rod 320 and the toggle member 340 is at an eccentric position of the toggle member 340, and the end with a smaller distance from the telescopic rod 320 in the left-right direction is set as the first end, and the end with a larger distance from the telescopic rod 320 is set as the second end. In the initial state, the first end of the toggle member 340 is on the left and the second end is on the right. The short rod 312 of the connecting rod unit 310 is located at the lower side of the fixed rod 311 and is in line with the linkage rod 314. Fig.12 When the power mechanism 300 is in the first stage, the short rod 312 of the connecting rod unit 310 rotates clockwise to drive the telescopic rod 320 to move leftward. The telescopic rod 320 first contacts the side wall of the slide slot 341 close to the first end, so that the electromagnet at the first end is energized and fixed to the transmission belt 200. Then the connecting rod unit 310 continues to drive the telescopic rod 320 to move leftward, and the telescopic rod 320 drives the toggle member 340 to rotate around the arc surface of the first end. Since the distance between the first end and the telescopic rod 320 is small, the telescopic rod 320 only needs to move a small distance to the left to drive the toggle member 340 to rotate until the first end is on the right and the second end is on the left. Fig.13 As shown, at this time, the spring 321 in the telescopic rod 320 is squeezed to the limit, and the upper end of the long rod 313 is located to the right of the lower end. Afterwards, the telescopic rod 320 can continue to move leftward under the drive of the connecting rod unit 310, and the telescopic rod 320 abuts against the side wall of the slide slot 341 near the second end, so that the electromagnet at the second end is energized and fixed to the transmission belt 200. However, since the spring 321 in the telescopic rod 320 is squeezed to the limit, it is difficult for the telescopic rod 320 to be further shortened to cause the toggle member 340 to rotate around the second end. Therefore, under the push of the telescopic rod 320, the second end of the toggle member 340 pushes the upper side of the transmission belt 200 to move to the left, causing the upper side of the transmission belt 200 to partially deform downward and fit the material storage trough 150. When the long rod 313 rotates to the left of the lower end, the telescopic rod 320 can be further extended. When the telescopic rod 320 continues to move to the left, the toggle member 340 will be tilted with the second end at the upper left and the first end at the lower right. When the connecting rod unit 310 drives the telescopic rod 320 to move to the left to the limit position, the short rod 312 is located above the fixed rod 311 and is in line with the linkage rod 314. Fig.14 When the power mechanism 300 is in the second stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move rightward, and the telescopic rod 320 abuts against the side wall of the slide slot 341 close to the first end. Both electromagnets are energized to be adsorbed and fixed to the transmission belt 200. The telescopic rod 320 drives the upper side of the transmission belt 200 to move rightward synchronously through the toggle member 340, so that the upper side of the transmission belt 200 is restored to the horizontal state, and the toggle member 340 is restored to the horizontal state with the second end on the left and the first end on the right, as shown in FIG. Fig.15 Then the telescopic rod 320 continues to move to the right until the short rod 312 rotates to the lower side of the fixed rod 311 and is in line with the linkage rod 314, as shown in FIG. Fig.16In this process, as the short rod 312 continues to rotate clockwise from the position above the fixed rod 311 and in line with the linkage rod 314, the telescopic rod 320 is driven to move quickly to the right, thereby accelerating the flow of the material in the groove on the side of the transmission belt 200, causing the material to roll on the transmission belt 200. When the power mechanism 300 is in the third stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move leftward. The telescopic rod 320 first moves to abut against the side wall of the slide groove 341 close to the second end, and the electromagnet located at the second end of the toggle member 340 is energized and fixed to the transmission belt 200. Then the connecting rod unit 310 continues to drive the telescopic rod 320 to move leftward, and the telescopic rod 320 drives the toggle member 340 to rotate around the arc surface of the second end. Since the distance between the second end and the telescopic rod 320 is large, when the telescopic rod 320 moves to the extreme left position, the toggle member 340 just rotates to the first end on the left and the second end on the right. At this time, the short rod 312 of the connecting rod unit 310 is located on the upper side of the fixed rod 311 and is in line with the linkage rod 314. Fig.17 As shown, during this process, the transmission belt 200 does not move. When the power mechanism 300 is in the fourth stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move to the right, and the telescopic rod 320 abuts against the side wall of the slide slot 341 near the second end. Both electromagnets are energized and fixed to the transmission belt 200. The telescopic rod 320 drives the upper side of the transmission belt 200 to move to the right synchronously through the toggle member 340, so that the transmission belt 200 rotates as a whole, and then the upper side of the transmission belt 200 moves to the right to transport the material to the right for a certain distance, until the short rod 312 rotates to the lower side of the fixed rod 311 and is in line with the linkage rod 314, as shown in FIG. Fig.12 In each cycle, the short rod 312 of the connecting rod unit 310 rotates two circles.

[0048] Among them, a PLC module can be set to control the power on and off of the two electromagnets, and contact sensors are set on the left and right sides of the slide slot 341, and signal sensors are set at the two extreme positions of the left and right sliding of the sliding block 330. When the sliding block 330 leaves the signal sensor on the right and moves to the left, the PLC module controls the electromagnet corresponding to the end of the contact sensor abutting against the telescopic rod 320 to be energized; when the sliding block 330 leaves the signal sensor on the left and moves to the right, the PLC module controls both electromagnets to be energized when the telescopic rod 320 abuts against any contact sensor. In some other embodiments, the PLC module can also directly control the two electromagnets to be energized after the sliding block 330 triggers the signal sensor on the left, until the sliding block 330 moves to trigger the signal sensor on the right; and after the sliding block 330 triggers the signal sensor on the right, the PLC module controls the electromagnet corresponding to the end of the contact sensor abutting against the telescopic rod 320 to be energized until the sliding block 330 moves to trigger the signal sensor on the left.

[0049] In this embodiment, the power mechanism 300 further includes a motor 350 , which is mounted on the housing 100 and is used to drive the short rod 312 to rotate circumferentially around a hinge point between the short rod 312 and the fixed rod 311 .

[0050] In this embodiment, the connecting rod unit 310, telescopic rod 320, sliding block 330 and motor 350 of the power mechanism 300 are arranged in pairs and are respectively located on both sides of the width direction of the transmission belt 200. The other ends of the two telescopic rods 320 are respectively installed on the two ends of the toggle member 340 in the width direction of the transmission belt 200.

[0051] In this embodiment, the squeezing roller group 160 includes an inner roller 161 and an outer roller 162, both of which are rotatably mounted on the housing 100 around an axis that is horizontal and perpendicular to the left and right directions; the inner roller 161 is arranged on the inner ring of the transmission belt 200, and the outer roller 162 is arranged on the outer ring of the transmission belt 200, and both of the inner roller 161 and the outer roller 162 are located on the bisector of the angle at the upper corner of the left end of the transmission belt 200, and both of them abut against the transmission belt 200. Since the inner roller 161 and the outer roller 162 are both located at the upper corner of the left end of the transmission belt 200, the resistance of the transmission belt 200 to move to the left over the corner is relatively large, which can limit the leftward movement of the upper side of the transmission belt 200; and since the power mechanism 300 is located on the right side of the squeezing roller group 160, it can overcome the abutting force of the inner roller 161 and the outer roller 162 on it and drive the upper side of the transmission belt 200 to move to the right.

[0052] In this embodiment, a plurality of transmission rollers 170 are disposed in the housing 100 , and the plurality of transmission rollers 170 are rotatably installed on the housing 100 along an axis horizontally and perpendicular to the left-right direction; the transmission belt 200 is sleeved outside the plurality of transmission rollers 170 and rotates around the plurality of transmission rollers 170 .

[0053] In this embodiment, the tensioning structure 500 includes an elastic member 510 and a tensioning plate 520. The tensioning plate 520 is slidably installed in the housing 100 along the vertical direction. The elastic member 510 is disposed between the tensioning plate 520 and the housing 100, and always has a tendency to cause the tensioning plate 520 to abut against the transmission belt 200. The side of the tensioning plate 520 abutting against the transmission belt 200 is an arc surface.

[0054] In this embodiment, a material guide plate 190 is disposed in the housing 100 . The material guide plate 190 is located on the left side of the material blocking plate 180 and is used to guide the material entering from the feed inlet 120 to fall onto the transmission belt 200 .

[0055] In this embodiment, an auger blade 600 is further disposed in the housing 100. The auger blade 600 is rotatably mounted on the housing 100 around an axis that is horizontal and perpendicular to the left and right directions, and is located below the right side of the transmission belt 200, and is used to drive the dried material to be discharged from the discharge port 130. The auger blade 600 is externally connected to a motor (not shown in the figure) that drives it to rotate.

[0056] In this embodiment, the hot air circulation belt dryer further includes an exhaust mechanism 400 , which is connected to the bottom of the housing 100 and is used to extract the gas containing water vapor inside the housing 100 .

[0057] When the hot air circulating belt dryer of the present invention is in use, the material is fed from the feed port 120 onto the transmission belt 200. Since the lower end of the baffle plate 180 abuts against the upper side of the transmission belt 200, and the abutting position is located above the middle of the material storage tank 150, the material is accumulated on the transmission belt 200. At the same time, the heating structure 140 and the exhaust mechanism 400 are started, and the exhaust mechanism 400 causes the external air to enter the housing 100 from the air intake grille 110, and then pass through the transmission belt 200 after being heated by the heating structure 140 and discharged.

[0058] The motor 350 is started, and the motor 350 drives the short rod 312 of the connecting rod unit 310 to rotate. In the first stage, the short rod 312 of the connecting rod unit 310 rotates clockwise to drive the telescopic rod 320 to move leftward, and the telescopic rod 320 causes the toggle member 340 to flip first and then drives the upper side of the transmission belt 200 to move leftward, and then tilts, so that the upper side of the transmission belt 200 can partially deform downward and fit with the material storage trough 150, so that a groove is formed on the upper side of the transmission belt 200, and the material entering the feed inlet 120 falls into the groove of the transmission belt 200. In the second stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move rightward, and the telescopic rod 320 causes the toggle member 340 to drive the upper side of the transmission belt 200 to move rightward synchronously. Due to the obstruction of the material blocking plate 180, the transmission belt 200 will only bring out the material in the groove when it is stretched, and the material in the groove will roll on the transmission belt 200 when the transmission belt 200 is stretched. Further, when the short rod 312 drives the telescopic rod 320 to move rightward, the speed at which the hinge point of the long rod 313 and the linkage rod 314 swings to the right is faster than the speed at which it swings to the left, which will further accelerate the rolling of the material on the transmission belt 200. In the third stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move leftward, and the telescopic rod 320 causes the toggle member 340 to flip without moving, so that the toggle member 340 does not move the transmission belt 200. In the fourth stage, the short rod 312 of the connecting rod unit 310 continues to rotate clockwise to drive the telescopic rod 320 to move to the right. The telescopic rod 320 drives the upper side of the transmission belt 200 to move to the right synchronously through the toggle member 340, so that the transmission belt 200 rotates as a whole, and then the upper side of the transmission belt 200 moves to the right to transport the material to the right for a certain distance. After that, the power mechanism 300 enters the next cycle and repeats the above four stages to work. In each cycle, the power mechanism 300 causes the transmission belt 200 to carry out a certain amount of material and move to the right for a certain distance, so that the transmission belt 200 evenly transports the material, thereby ensuring the drying effect of the material. And the transmission belt 200 is stretched to make the material roll on the transmission belt 200, further accelerating the drying of the material.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot air circulation belt dryer, characterized in that: It includes a housing, a transmission belt and a power mechanism; The transmission belt is an annular mesh structure and is arranged in the housing. The upper side of the transmission belt is horizontal and arranged in the left and right directions. A tensioning structure is arranged between the transmission belt and the housing, and the tensioning structure causes the transmission belt to remain tensioned. An air intake grille, a feed port and a discharge port are arranged on the outer shell. The air intake grille is arranged above the transmission belt, and a heating structure is arranged on the lower side of the corresponding air intake grille in the outer shell; the feed port is located above the left end of the transmission belt, and the discharge port is located below the right side of the transmission belt; A material storage trough is arranged in the housing and at the lower side of the left end of the upper side of the transmission belt, and the material storage trough is located below the feed port; an extrusion roller group is arranged in the housing and at the upper corner of the left end of the transmission belt, and the extrusion roller group prevents the transmission belt at that location from moving to the left and allows the transmission belt at that location to move to the right; The power mechanism is arranged in the housing, and causes the transmission belt to move periodically to transport materials. In each cycle, the action of the power mechanism on the transmission belt is divided into four stages. In the first stage, the power mechanism drives the upper side of the transmission belt to move to the left, so that the upper side of the transmission belt is partially deformed downward and fits with the storage tank; in the second stage, the power mechanism drives the upper side of the transmission belt to move to the right, and brings out the materials stored when the transmission belt fits with the storage tank; in the third stage, the power mechanism is an empty stroke; in the fourth stage, the power mechanism drives the upper side of the transmission belt to move to the right; A material baffle is arranged inside the shell, and the material baffle prevents the materials falling on the transmission belt beyond the position where the material baffle fits with the material storage tank from flowing to the right.

2. A hot air circulation belt dryer according to claim 1, characterized in that: The power mechanism is arranged on the lower side of the upper side of the transmission belt, and includes a connecting rod unit, a telescopic rod, a sliding block and a toggle piece; the connecting rod unit is a four-link structure hinged end to end, and one side of the connecting rod unit is fixed; the sliding block is slidably installed on the shell along the left and right directions, and the telescopic rod slides with the sliding block in the vertical direction and can move left and right synchronously with the sliding block, and is restricted by the sliding block to rotate around the horizontal axis; the telescopic rod is telescopic and has a spring inside; one end of the telescopic rod is hinged to the hinge position of the two freely movable sides in the connecting rod unit, and the other end is hinged to the toggle piece and slidably connected along the left and right directions; the connecting rod unit drives the telescopic rod to move back and forth left and right; the toggle piece is located above the sliding block, and the left and right sides of the toggle piece Both are equipped with electromagnets; the inner ring of the transmission belt is equipped with a magnetic block; the hinge position of the telescopic rod and the toggle piece is between the two electromagnets, and the sliding range of the telescopic rod on the toggle piece is eccentrically set in the left and right directions of the toggle piece; when the telescopic rod moves to the left to the left end of its sliding range, the electromagnet located at the left end of the toggle piece is energized, so that the left side of the toggle piece is adsorbed and fixed to the lower side of the upper side of the transmission belt, and when the telescopic rod continues to move to the left, it drives the toggle piece to flip around its left end; when the telescopic rod moves to the right to the right end of its sliding range, both electromagnets are energized, so that both ends of the toggle piece are adsorbed and fixed to the lower side of the upper side of the transmission belt, and when the telescopic rod continues to move to the right, it drives the upper side of the transmission belt to move to the right synchronously.

3. A hot air circulation belt dryer according to claim 2, characterized in that: The connecting rod unit includes a fixed rod, a short rod, a long rod and a linkage rod. The fixed rod is arranged in the left-right direction and fixed in the shell; one end of the short rod and the long rod are respectively hinged to the two ends of the fixed rod, and the two ends of the linkage rod are respectively hinged to the other ends of the short rod and the long rod; the length of the short rod is smaller than that of the long rod and the short rod is located on the right side of the long rod, and the telescopic rod is hinged to the hinge point of the long rod and the linkage rod.

4. A hot air circulation belt dryer according to claim 3, characterized in that: The power mechanism also includes a motor, which is installed on the housing and is used to drive the short rod to rotate circumferentially around a hinge point between the short rod and the fixed rod.

5. The hot air circulation belt dryer according to claim 1, characterized in that: The extrusion roller group includes an inner roller and an outer roller, both of which are mounted on an outer shell and rotate around an axis that is horizontal and perpendicular to the left and right directions; the inner roller is arranged on the inner ring of the transmission belt, and the outer roller is arranged on the outer ring of the transmission belt, and both of the inner roller and the outer roller are located on the angular bisector of the upper corner of the left end of the transmission belt, and are in contact with the transmission belt.

6. The hot air circulation belt dryer according to claim 1, characterized in that: A plurality of transmission rollers are arranged in the shell, and the plurality of transmission rollers are rotatably mounted on the shell along axes horizontally and perpendicular to the left and right directions; a transmission belt is sleeved outside the plurality of transmission rollers and rotates around the plurality of transmission rollers.

7. The hot air circulation belt dryer according to claim 1, characterized in that: The tensioning structure comprises an elastic member and a tensioning plate. The tensioning plate is slidably installed in the shell along the vertical direction. The elastic member is arranged between the tensioning plate and the shell and always has a tendency to cause the tensioning plate to abut against the transmission belt.

8. The hot air circulation belt dryer according to claim 1, characterized in that: A material guide plate is arranged inside the shell, and the material guide plate is located on the left side of the material baffle plate, and is used for guiding the material entering from the feed port to fall onto the transmission belt.

9. The hot air circulation belt dryer according to claim 1, characterized in that: An auger blade is also provided in the shell. The auger blade is installed on the shell to rotate around an axis horizontally and perpendicular to the left and right directions and is located below the right side of the transmission belt to drive the dried material to be discharged from the discharge port.

10. The hot air circulation belt dryer according to claim 1, characterized in that: It also includes an air extraction mechanism, which is connected to the bottom of the shell and is used to extract the gas containing water vapor inside the shell.

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