Pastry flour scattering equipment with recovery device

Abstract

Pastry flour scattering equipment with a recovery device comprises a flour scattering space, a flour scattering device, a recovery device and a control device, the powder scattering device is positioned at the upper part of the powder scattering space and comprises a powder bin; the conveying device comprises a conveying belt, pastries are placed on the conveying belt and pass through the lower portion of the flour scattering device, and the conveying belt is provided with a feeding channel and a discharging channel on the two sides of the flour scattering space; the recovery device comprises a recovery bin, a negative pressure generator, an air blowing part and a recovery pipeline group, and the recovery pipeline group comprises a first recovery pipeline and a second recovery pipeline; two ends of the first recycling pipeline are respectively connected with the feeding channel and the recycling bin; two ends of the second recycling pipeline are respectively connected with the discharging channel and the recycling bin; the negative pressure generator maintains negative pressure in the recycling bin and the recycling pipeline set so as to suck flour, and the blowing piece blows down the flour attached to the filtering piece. According to the flour recycling device, unpolluted flour can be recycled and reused, and the recycling device further has the anti-blocking and self-cleaning functions.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, and more particularly to a flour-sprinkling device with a recovery device. Background Art

[0002] During the production and processing of pastries, it is generally inevitable to transport semi-finished pastries or formed pastries on a conveyor to the next step or packaging. In order to prevent the pastries from sticking to each other or between the pastries and the conveyor, flour needs to be sprinkled on the surface of the pastries.

[0003] In the process of sprinkling powder in the existing powder sprinkling equipment, the flour is easy to fly in the air, and even diffuse in the entire production workshop. When the density of flour in the air is high, it is easy to cause harm to people's respiratory tract, and the flour is easy to explode when it encounters open flames, threatening people's lives. It is also easy to deposit on the pastry conveying device or other equipment, causing pollution to the production environment. In addition, the easy floating characteristic of flour leads to an increase in the consumption of flour during the powder sprinkling step, and only a part of the flour is actually used, which indirectly increases the production cost of pastries. Therefore, it is necessary to recycle the scattered flour.

[0004] There are generally two ways to recycle flour in the existing flour recycling devices of flour spreading equipment, and both have certain defects: 1. Only the flour that has been deposited on the pastry conveying device is recycled, and the flour that is still floating in the air in the equipment cannot be recycled. In addition, since the flour has come into contact with the conveying device or pastry, the recycled flour cannot be directly reused, which still causes waste; 2. The flour floating in the air is recovered by pressure difference. However, since the flour is a fine powder structure, it is easy to cause blockage of the recovery device, which may affect the recovery effect and service life of the recovery device. Summary of the invention

[0005] The purpose of the present invention is to provide a flour-sprinkling device for pastries with a recovery device, which can recover and reuse uncontaminated flour, and the recovery device also has anti-blocking and self-cleaning functions.

[0006] To achieve the above object, the present invention provides a pastry powder sprinkling device with a recovery device, comprising: The powder sprinkling space is enclosed into a cavity by the blocking surface; A powder spreading device, located at the upper part of the powder spreading space, includes a powder bin; A conveying device passes through the lower part of the powder sprinkling space and includes a conveyor belt. The pastries are placed on the conveyor belt and pass under the powder sprinkling device. The powder sprinkling device sprinkles flour on the pastries. The conveyor belt passes through the baffle surface of the powder sprinkling space, and along the conveying direction of the pastries, a feed baffle surface and a discharge baffle surface are defined in the baffle surface passed by the conveyor belt, and powder baffle covers covering the conveyor belt are respectively connected to the feed baffle surface and the discharge baffle surface, and a feed and discharge channel and a discharge channel are respectively defined between the two powder baffle covers and the conveyor belt, and the pastries pass through the feed channel, the powder sprinkling space, and the discharge channel on the conveyor belt in sequence; The recovery device comprises a recovery bin, a filter element, a negative pressure generator, an air blowing element, and a recovery pipeline group; the recovery bin is located above the powder spreading device and is provided with a valve baffle at the lower end, and the separation and connection between the recovery bin and the powder bin are controlled by opening and closing the valve baffle, and the recovery bin is also provided with an exhaust port that is connected to the outside and through which flour cannot pass on the peripheral wall above the valve baffle; a top cover is sealed on the upper end of the recovery bin, and the negative pressure generator and the air blowing element are arranged on the top cover, and the negative pressure generator, the air blowing element and the recovery bin are separated by the filter element through which flour cannot pass; The recovery pipeline group includes a first recovery pipeline and a second recovery pipeline; both ends of the first recovery pipeline are respectively connected to the feed channel and the recovery bin; both ends of the second recovery pipeline are respectively connected to the discharge channel and the recovery bin; The negative pressure generator is used to maintain the negative pressure in the recovery bin and the recovery pipe group to suck the flour into the recovery bin, and the blowing piece is used to blow off the flour attached to the filter element.

[0007] Furthermore, the recovery device also includes a powder receiving trough, which is located below the conveyor belt where the powder sprinkling space is located, and is used to collect flour that has not fallen onto the conveyor belt; the recovery pipe group also includes a third recovery pipe, one end of the third recovery pipe is connected to the powder receiving trough, and the other end is connected to the recovery bin.

[0008] Furthermore, the top cover has an upper cover body and a lower cover body, a top cover air cavity is provided between the upper cover body and the lower cover body, a negative pressure generator and a blowing piece are installed on the upper cover body, and a negative pressure hole and a blowing hole are provided on the upper cover body, and the negative pressure hole and the blowing hole are respectively used to connect the top cover air cavity with the negative pressure generator and the blowing piece.

[0009] Furthermore, the filter element includes at least one filter cartridge arranged on the lower surface of the lower cover body, the upper end of each filter cartridge is connected to the air cavity of the top cover and the lower end is located in the recovery bin, and the blowing element is connected to an air tank, which is arranged on the top cover.

[0010] Furthermore, one ends of the first recovery pipe, the second recovery pipe, and the third recovery pipe are connected to the recovery bin after being interconnected.

[0011] Furthermore, valves for controlling the connection relationship between the first recovery pipeline, the second recovery pipeline and the third recovery pipeline are respectively provided.

[0012] Furthermore, it also includes two recovery channels and a recovery box located below the flour receiving trough. One end of the two recovery channels is respectively arranged below the two ends of the conveyor belt, and the other end is located above the recovery box. The flour falling from the two ends of the conveyor belt is collected into the recovery box through the recovery channel.

[0013] Furthermore, the exhaust port is a cylindrical structure, convexly arranged on the outer wall of the recovery bin, and the outer end of the exhaust port is wrapped with a filter material that flour cannot pass through.

[0014] Furthermore, a powder outlet net is provided on the bottom surface of the powder bin, and a manually openable powder bin cover is provided on the top surface of the powder bin; the powder spreading device also includes a powder sweeping assembly arranged in the powder bin, the powder sweeping assembly includes a rotatable rotating shaft and a plurality of powder sweeping sheets, the powder sweeping sheets are fixed on the rotating shaft and rotate in the powder bin with the rotating shaft, and are used to break up the flour in the powder bin and sweep it to the powder outlet net.

[0015] Furthermore, the powder spreading device also includes a powder raising brush, which is rotatably arranged below the powder bin and located on both sides of the conveyor belt. The powder raising brush is driven by the motor to rotate and raise the flour.

[0016] After adopting the above scheme, the negative pressure generator in the recovery device of the present invention keeps the recovery bin and the recovery pipe group (i.e., the first recovery pipe and the second recovery pipe) in a negative pressure state, so that the flour that is about to be dispersed into the air from the feeding channel and the discharging channel is sucked into the recovery bin through the first recovery pipe and the second recovery pipe, so that the flour that has not fallen on the surface of the pastry and is not contaminated can enter the recovery bin, and the valve baffle at the bottom of the recovery bin can be opened to allow the recovered flour to fall into the powder bin and be put back into use. Therefore, the present invention recycles the flour in the pastry powder spreading equipment by setting a recovery device, which can not only inhibit the flour from being dispersed in the air, reduce the safety hazards in the workshop, and avoid harm to people's respiratory tract, but also further allow the uncontaminated flour (referring to being directly recovered without contacting the pastry) to be put back into use, reduce the consumption of flour, and reduce the production cost.

[0017] In addition, since the flour particles are fine, the present invention uses a filter element to separate the negative pressure generator and the recovery bin to filter the flour and prevent the flour from entering the negative pressure generator and causing blockage. It is also equipped with a blowing element. When a certain amount of flour is attached to the filter element, the blowing element is switched to work to blow (backblow) the flour on the filter element into the recovery bin to prevent flour blockage from affecting the working efficiency of the recovery device. The recovery bin is also provided with an exhaust port through which flour cannot pass, so as to balance the air pressure inside and outside the recovery bin when the blowing element is working.

[0018] In addition, a third recovery pipe and a powder receiving trough are provided, so that the uncontaminated flour falling into the powder receiving trough is sucked into the recovery bin through the third recovery pipe and put back into use, thereby further saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the present invention (showing the recycling device).

[0021] Figure 3 This is an exploded view of the recovery device (the recovery pipe is not shown).

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention (showing the powder sprinkling space).

[0023] Figure 5 A schematic diagram of the structure of the transmission device.

[0024] Figure 6 It is a schematic diagram of the structure of the powder spreading device.

[0025] Description of Figure Numbers: 101: inlet stop surface; 102: outlet stop surface; 10 powder spreading device; 1 powder bin; 11 powder outlet net; 12 powder bin cover; 13 powder sweeping assembly; 131 rotating shaft; 132 powder sweeping sheet; 14 powder raising brush; 20 conveying device; 2 conveyor belt; 21 powder blocking cover; 22 conveyor belt gap; 30 recovery device; 3 recovery bin; 31 top cover; 311 upper cover body; 3111 negative pressure hole; 3112 blowing hole; 312 lower cover body; 3121 filter hole; 32 valve baffle; 33 filter cartridge; 34 negative pressure generator; 35 blowing part; 351 gas tank; 352 exhaust port; 36 first recovery pipeline; 37 second recovery pipeline; 38 third recovery pipeline; 39 powder receiving tank; S valve; a feeding channel; b discharging channel; 41 recycling channel; 42 recycling box. DETAILED DESCRIPTION

[0026] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0027] See also Figures 1 to 4 , a pastry powder sprinkling device with a recovery device is shown, the pastry powder sprinkling device includes a powder sprinkling space, and the powder sprinkling space is surrounded by a blocking surface to form a cavity. In this embodiment, the powder sprinkling space is surrounded by the blocking surfaces on all sides.

[0028] The powder spreading space mainly includes a powder spreading device 10, a conveying device 20, and a recovery device, wherein the recovery device is the main invention point of the present invention. The specific structures of the three devices are described as follows: 1. Powder spreading device 10 (see Figure 6), located in the upper part of the powder sprinkling space, includes a powder bin 1, a powder outlet net 11 is provided on the bottom surface of the powder bin 1, and a powder bin cover 12 which can be opened manually is provided on the top surface of the powder bin 1; the powder sprinkling device 10 also includes a powder sweeping assembly 13, the powder sweeping assembly 13 is arranged in the powder bin 1, includes a rotatable rotating shaft 131 and a plurality of powder sweeping sheets 132, the powder sweeping sheets 132 are fixed on the rotating shaft 131, rotate with the rotating shaft 131 in the powder bin 1, and are used for breaking up the flour in the powder bin 1 and sweeping it to the powder outlet net 11, specifically, the rotating shaft 131 can be driven to rotate by a motor, and the powder sweeping sheets 132 are circumferentially arranged on the rotating shaft 131. When the powder sprinkling process is started, the powder bin cover 12 can be opened to add flour, and the flour falls onto the powder sweeping assembly 13, is dispersed by the rotating powder sweeping sheet 132 and reaches the powder outlet net 11 at the bottom of the powder bin 1, and is sprinkled on the pastry below the powder bin 1 through the powder outlet net 11. The powder sweeping sheet 132 can enable the flour to reach the powder outlet net 11 at the bottom of the powder bin 1 instead of accumulating in a dead corner in the powder bin 1, thereby preventing the flour from clumping and also promoting the flour to pass through the powder outlet net 11. The powder outlet net 11 can make the powder sprinkling more uniform and prevent the flour from clumping and falling.

[0029] 2. Conveying device 20 (see Figure 5 ), passing through the lower part of the powder sprinkling space, including a conveyor belt 2, the pastries are placed on the conveyor belt 2 and pass under the powder sprinkling device 10, and the powder sprinkling device 10 sprinkles flour on the pastries. The conveyor belt 2 passes through the baffle surface of the powder sprinkling space. In the present embodiment, the conveyor belt 2 is arranged to pass through two opposite baffle surfaces around the powder sprinkling space in a straight line. Along the conveying direction of the pastries, the two baffle surfaces passed by the conveyor belt are defined as a feed baffle surface 101 and a discharge baffle surface 102, respectively. The feed baffle surface 101 and the discharge baffle surface 102 are respectively connected with powder baffle covers 21 covering the conveyor belt 2. The two powder baffle covers 21 and the conveyor belt 2 define a feed channel a and a discharge channel b respectively. The pastries pass through the feed channel a, the powder sprinkling space and the discharge channel b on the conveyor belt 2 in sequence. The feed baffle surface 101 and the discharge baffle surface 102 are provided to provide the conveyor belt 2 with the feed channel a and the discharge channel b, so that the flour can be blocked from escaping to a certain extent, and the flour can be prevented from being directly scattered into the air outside the pastry sprinkling equipment, which also plays a positive role in the recovery of the flour.

[0030] Since the conveyor belt 2 of the conveying device 20 passes under the powder sprinkling device 10, that is, passes under the powder outlet net 11, when the flour falling from the powder outlet net 11 falls on the pastry, it generally cannot cover the side surface of the pastry. Therefore, the powder sprinkling device 10 also includes a powder brush 14, which is rotatably arranged under the powder bin 1 and located on both sides of the conveyor belt 2. The powder brush 14 is driven by the motor to rotate and lifts the flour that falls on the conveyor belt 2 or the powder brush 14, and the lifted flour can contact the pastry from all directions, so that the side surface of the pastry can also contact and be stained with flour.

[0031] The powder sprinkling device 10 and the conveying device 20 are relatively basic structures in general pastry powder sprinkling equipment. The above only provides an embodiment of the present invention, and other embodiments are not described in detail here.

[0032] The flour-sprinkling device of the present invention also includes a recovery device, which, in addition to the flour-sprinkling function, also has a flour recovery function, and can collect uncontaminated flour for reuse. Uncontaminated flour refers to flour that is floating in the air or has not fallen on the surface of the dough, and can also be reused.

[0033] The recovery device includes a recovery bin 3, a filter element, a negative pressure generator 34, a blowing element 35, and a recovery pipe group, wherein the number of recovery pipe groups, the positions of the pipe ends, and the paths of the pipes can be flexibly adjusted according to actual usage requirements or the specific structure of the pastry powder sprinkling equipment. Preferably, the recovery pipe group of this embodiment includes: a first recovery pipe 36, a second recovery pipe 37, and a third recovery pipe 38.

[0034] The recovery bin 3 is located above the powder spreading device 10 and is provided with a valve baffle 32 at the lower end. The separation and connection between the recovery bin 3 and the powder bin 1 are controlled by opening and closing the valve baffle 32. The recovery bin 3 is also provided with an exhaust port 352 on the peripheral wall above the valve baffle 32, which is connected to the outside and through which flour cannot pass. The upper end sealing cover of the recovery bin 3 is sealed with a top cover 31, and a negative pressure generator 34 and a blowing member 35 are arranged on the top cover 31. The negative pressure generator 34, the blowing member 35 and the recovery bin 3 are separated by a filter member through which flour cannot pass.

[0035] The negative pressure generator 34 is used to maintain the negative pressure in the recovery bin 3 and the recovery pipeline group to suck in the flour, and the blowing member 35 is used to blow off the flour attached to the filter element.

[0036] Specifically, see Figure 3 The recovery bin 3 can be a split structure (divided into three sections), the bottom section is connected to the top of the powder bin 1, the valve baffle 32 is arranged at the bottom end of the middle section, the exhaust port 352 is located on the peripheral wall of the middle section, the three recovery pipes are connected to the peripheral wall of the top section, and the top cover 31 covers the upper end of the top section.

[0037] The top cover 31 has an upper cover body 311 and a lower cover body 312, and there is an air cavity of the top cover 31 between the upper cover body 311 and the lower cover body 312. The negative pressure generator 34 and the blowing member 35 are installed on the upper cover body 311. The upper cover body 311 is provided with a negative pressure hole 3111 and a blowing hole 3112, which are respectively used to connect the air cavity of the top cover 31 with the negative pressure generator 34 and the blowing member 35. The blowing member 35 is connected with an air tank 351, and the air tank 351 is arranged on the top cover 31. Gas is stored in the air tank 351 for the blowing member 35 to blow.

[0038] The lower cover 312 is provided with four filter holes 3121, and the filter element includes four filter cartridges 33 arranged on the lower surface of the lower cover 312. The upper end of each filter cartridge 33 is connected to the air cavity of the top cover 31 through the filter hole 3121, and the lower end of the filter cartridge 33 is located in the recovery bin 3. The filter cartridge 33 itself has a certain strength. When the recovery bin 3 maintains a negative pressure, it is not easy to be deformed and damaged due to air pressure. Due to the setting of the filter cartridge 33, when the negative pressure generator 34 is working, the flour in the recovery bin 3 will be isolated on the lower side of the lower cover 312, and cannot pass through the filter cartridge 33 to reach the air cavity of the top cover 31, so it cannot enter the negative pressure generator 34, so as to avoid the flour blocking the negative pressure generator 34.

[0039] The exhaust port 352 is a cylindrical structure, which is protruded from the outer wall of the recovery bin 3. The outer end of the exhaust port 352 is wrapped with a filter material (not shown) that flour cannot pass through. The filter material can be a soft sheet similar to cloth, which is tightly wrapped on the exhaust port 352. When the blowing member 35 is working to blow air, the filter material can be deformed and bulged, and the air blown out of the blowing member 35 passes through the filter material and is sprayed out of the recovery bin 3.

[0040] The material of the filter cartridge 33 and the filter material wrapped around the outer end of the exhaust port 352 are both densely meshed filter materials that flour cannot pass through and are only used for air to pass through.

[0041] Specific reference Figure 2 The powder receiving trough 39 is located below the conveyor belt 2 where the powder sprinkling space is located, and is used to receive the flour that has not fallen onto the conveyor belt 2 (there is a conveyor belt gap 22 between the two sides of the conveyor belt 2 and the powder brush 14, and some flour may fall into the powder receiving trough 39 from the conveyor belt gap 22). One ends of the first recovery pipe 36, the second recovery pipe 37, and the third recovery pipe 38 are connected to the recovery bin 3 after being connected to each other, and the other ends of the first recovery pipe 36, the second recovery pipe 37, and the third recovery pipe 38 are respectively connected to the feed channel a, the discharge channel b, and the powder receiving trough 39.

[0042] Preferably, valves S for controlling the connection relationship between the first recovery pipeline 36, the second recovery pipeline 37, and the third recovery pipeline 38 and the recovery bin 3 may be provided respectively to control whether the three recovery pipelines are working.

[0043] When the powder spreading device is working, the recovery device works synchronously, and the negative pressure generator 34 keeps the recovery bin 3, the first recovery pipe 36, the second recovery pipe 37, and the third recovery pipe 38 in a negative pressure state, so that the flour that is about to float into the air from the feeding channel a and the discharging channel b is sucked into the recovery bin 3 through the first recovery pipe 36 and the second recovery pipe 37 respectively, and the powdered flour is prevented from floating outward; the flour that falls into the powder receiving slot 39 is sucked into the recovery bin 3 through the third recovery pipe 38, so that the flour that has not fallen on the surface of the pastry and is not contaminated can enter the recovery bin 3; when a certain amount of flour is absorbed, the valve baffle 32 at the bottom of the recovery bin 3 can be opened, so that the recovered flour falls into the powder bin 1 and is put into use again. Therefore, the present invention recycles the flour in the pastry powder spreading device by setting a recovery device, which can not only inhibit the flour from floating in the air, reduce the safety hazards of the workshop, and avoid harm to people's respiratory tract, but also further put the uncontaminated flour into use again, reduce the consumption of flour, and reduce the production cost.

[0044] Since the flour particles are fine, the present invention uses a filter element to separate the negative pressure generator 34 and the recovery bin 3 to filter the flour and prevent the flour from entering the negative pressure generator 34 and causing blockage. The negative pressure generator 34 is also equipped with a blowing element 35. When a certain amount of flour is attached to the filter element, the blowing element 35 is switched to work to blow (backblow) the flour on the filter element into the recovery bin 3 to prevent the flour from clogging and affecting the working efficiency of the recovery device. The recovery bin 3 is also provided with an exhaust port 352 through which flour cannot pass, so as to balance the air pressure inside and outside the recovery bin 3 when the blowing element 35 is working.

[0045] Preferably, the present invention also includes two recovery channels 41 and a recovery box 42 located below the powder receiving slot 39, which are used to recover the flour that has been contaminated (may have been in contact with the dough and have moisture or have agglomerated and cannot be directly used) and has fallen on the conveyor belt 2. One end of the two recovery channels 41 is respectively arranged below the two ends of the conveyor belt 2, and the other end is located above the recovery box 42. The flour that falls from the two ends of the conveyor belt 2 is collected into the recovery box 42 through the recovery channels. In this way, the flour that can be directly recycled and the flour that cannot be directly recycled can be collected separately, thereby improving the recycling rate.

[0046] The above is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flour-sprinkling device with a recovery device, characterized in that: include: The powder sprinkling space is enclosed into a cavity by the blocking surface; A powder spreading device, located at the upper part of the powder spreading space, includes a powder bin; A conveying device passes through the lower part of the powder sprinkling space and includes a conveyor belt. The pastries are placed on the conveyor belt and pass under the powder sprinkling device. The powder sprinkling device sprinkles flour on the pastries. The conveyor belt passes through the baffle surface of the powder sprinkling space, and along the conveying direction of the pastries, a feed baffle surface and a discharge baffle surface are defined in the baffle surface passed by the conveyor belt, and powder baffle covers covering the conveyor belt are respectively connected to the feed baffle surface and the discharge baffle surface, and a feed and discharge channel and a discharge channel are respectively defined between the two powder baffle covers and the conveyor belt, and the pastries pass through the feed channel, the powder sprinkling space, and the discharge channel on the conveyor belt in sequence; The recovery device comprises a recovery bin, a filter element, a negative pressure generator, an air blowing element, and a recovery pipeline group; the recovery bin is located above the powder spreading device and is provided with a valve baffle at the lower end, and the separation and connection between the recovery bin and the powder bin are controlled by opening and closing the valve baffle, and the recovery bin is also provided with an exhaust port connected to the outside and through which flour cannot pass on the peripheral wall above the valve baffle; the upper end sealing cover of the recovery bin is closed with a top cover, and the negative pressure generator and the air blowing element are arranged on the top cover, and the negative pressure generator, the air blowing element and the recovery bin are separated by the filter element through which flour cannot pass; The recovery pipeline group includes a first recovery pipeline and a second recovery pipeline; both ends of the first recovery pipeline are respectively connected to the feed channel and the recovery bin; both ends of the second recovery pipeline are respectively connected to the discharge channel and the recovery bin; The negative pressure generator is used to maintain the negative pressure in the recovery bin and the recovery pipe group to suck the flour into the recovery bin, and the blowing piece is used to blow off the flour attached to the filter element.

2. The flour sprinkling device with a recovery device according to claim 1, characterized in that: The recovery device also includes a powder receiving trough, which is located below the conveyor belt where the powder sprinkling space is located, and is used to receive flour that has not fallen onto the conveyor belt; the recovery pipeline group also includes a third recovery pipeline, one end of the third recovery pipeline is connected to the powder receiving trough, and the other end is connected to the recovery bin.

3. The flour sprinkling device with a recovery device according to claim 1 or 2, characterized in that: The top cover comprises an upper cover body and a lower cover body, a top cover air cavity is arranged between the upper cover body and the lower cover body, a negative pressure generator and a blowing piece are installed on the upper cover body, a negative pressure hole and a blowing hole are arranged on the upper cover body, and the negative pressure hole and the blowing hole are respectively used to connect the top cover air cavity with the negative pressure generator and the blowing piece.

4. The flour sprinkling device with a recovery device according to claim 3, characterized in that: The filter element includes at least one filter cartridge disposed on the lower surface of the lower cover body, the upper end of each filter cartridge is connected to the air cavity of the top cover and the lower end is located in the recovery bin, the blowing element is connected to an air tank, and the air tank is disposed on the top cover.

5. The pastry powder sprinkling device with a recovery device according to claim 2, characterized in that: One ends of the first recovery pipe, the second recovery pipe, and the third recovery pipe are connected to the recovery bin after being interconnected.

6. The flour sprinkling device with a recovery device according to claim 2, characterized in that: The first recovery pipeline, the second recovery pipeline and the third recovery pipeline are respectively provided with valves for controlling the connection relationship between the pipeline and the recovery bin.

7. The pastry powder sprinkling device with a recovery device according to claim 1 or 2, characterized in that: It also includes two recovery channels and a recovery box located below the powder receiving trough. One end of the two recovery channels is respectively arranged below the two ends of the conveyor belt, and the other end is located above the recovery box. The flour falling from the two ends of the conveyor belt is collected into the recovery box through the recovery channels.

8. The pastry powder sprinkling device with a recovery device according to claim 1 or 2, characterized in that: The exhaust port is a cylindrical structure, convexly arranged on the outer wall of the recovery bin, and the outer end of the exhaust port is wrapped with a filter material that flour cannot pass through.

9. The pastry powder sprinkling device with a recovery device according to claim 1 or 2, characterized in that: A powder outlet net is provided on the bottom surface of the powder bin, and a manually openable powder bin cover is provided on the top surface of the powder bin; the powder spreading device also includes a powder sweeping assembly arranged in the powder bin, the powder sweeping assembly includes a rotatable rotating shaft and a plurality of powder sweeping sheets, the powder sweeping sheets are fixed on the rotating shaft and rotate in the powder bin with the rotating shaft, and are used to break up the flour in the powder bin and sweep it to the powder outlet net.

10. The pastry powder sprinkling device with a recovery device according to claim 1 or 2, characterized in that: The powder spreading device also includes a powder raising brush, which is rotatably arranged below the powder bin and located on both sides of the conveyor belt. The powder raising brush is driven by the motor to rotate and raise the flour.

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