Full-automatic donkey-hide gelatin block decocting machine

By introducing conveying, paving, leveling and cutting devices into the donkey-hide gelatin boiling device, automatic bearing, uniform paving, thickness control and cutting of donkey-hide gelatin slurry is realized, which solves the problem of heavy manual operation in the existing technology and improves the degree of automation and efficiency.

CN222264353UActive Publication Date: 2024-12-31SHANDONG HUAZHENTANG EJIAO CO LTD
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Patent Information

Application Number
CN202323652108.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-30
Publication Date
2024-12-31
Estimated Expiration
2033-12-30

AI Technical Summary

Technical Problem

After the existing donkey-hide gelatin boiling device is completed, the operator needs to manually take it out, dry it and slice it, which increases labor intensity and lacks automation.

Method used

A fully automatic donkey-hide gelatin block boiling machine is designed, including a conveying device, paving device, auxiliary device, leveling device and cutting device. The donkey-hide gelatin is carried and cooled through the conveying device. The paving device is evenly spread and the leveling device controls the thickness. , the cutting device is automatically cut off to reduce manual operation.

Benefits of technology

The automation of donkey-hide gelatin block boiling process has been improved, the labor intensity of operators has been reduced, and the practicality and efficiency of the device have been improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of colla corii asini production, in particular to a full-automatic colla corii asini block decocting machine which is used for receiving decocted colla corii asini through a conveying device, providing a cooling and paving space for the colla corii asini, releasing decocted colla corii asini slurry to the conveying device through a paving device, and conveying the colla corii asini slurry to the conveying device. The paving effect of the paving device on the donkey-hide gelatin is improved through the auxiliary device; the thickness of the donkey-hide gelatin on the conveying device is limited through the leveling device, the cooled donkey-hide gelatin is cut off through the cutting device, and the labor intensity of operators is reduced; the practicability of the device is improved; comprising a pot body and a stirring motor, the stirring motor is installed on the upper end face of the pot body, a heating device, a stirring device and the like are arranged in the pot body, and the output end of the stirring motor penetrates through the upper end face of the pot body, enters the pot body and is connected with the stirring device; comprising a conveying device, a paving device, an auxiliary device, a leveling device and a cutting device.
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Description

Technical Field

[0001] The utility model relates to the technical field of donkey-hide gelatin production, in particular to a full-automatic donkey-hide gelatin block boiling machine. Background Art

[0002] Donkey hide gelatin is a tonic made by boiling donkey skin as the main raw material. It is amber in color, transparent and odorless. It is widely loved by people because of its effects of nourishing blood, stopping bleeding, nourishing yin and moistening dryness. Donkey hide gelatin blocks are made by cutting donkey hide gelatin into rectangular blocks after processing, which are easy to eat, store and transport.

[0003] In the prior art, a Chinese utility model patent with application number CN202320014164.4 relates to a donkey-hide gelatin boiling device, including a heat preservation device, a heating device, a supporting device, a bearing device and a stirring device, etc., which can improve the boiling efficiency of donkey-hide gelatin.

[0004] However, the above device can only be used to boil the donkey-hide gelatin in actual use. The operator is required to take out the donkey-hide gelatin, dry it and cool it down before slicing it, which increases the labor intensity of the operator and the degree of automation is insufficient. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a fully automatic donkey-hide gelatin block boiling machine which receives the cooked donkey-hide gelatin through a conveying device, provides space for cooling and spreading it, releases the cooked donkey-hide gelatin slurry onto the conveying device through a spreading device, and improves the spreading effect of the spreading device on the donkey-hide gelatin through an auxiliary device; limits the thickness of the donkey-hide gelatin on the conveying device through a leveling device, and cuts the cooled donkey-hide gelatin through a cutting device, thereby reducing the labor intensity of the operators; and improves the practicality of the device.

[0006] The utility model discloses a fully automatic donkey hide gelatin block boiling machine, comprising a pot body and a stirring motor, wherein the stirring motor is installed on the upper end surface of the pot body, and heating, stirring and other devices are arranged inside the pot body, and the output end of the stirring motor passes through the upper end surface of the pot body and enters into the pot body to be connected with the stirring device; the utility model comprises a conveying device, a spreading device, an auxiliary device, a leveling device and a cutting device, wherein the spreading device is installed on the output end of the pot body, the auxiliary device is installed on the spreading device, the leveling device is installed on the conveying device, and the cutting device is installed on the conveying device; the boiled donkey hide gelatin is received by the conveying device to provide a space for cooling and spreading, the boiled donkey hide gelatin slurry is released to the conveying device by the spreading device, and the spreading effect of the spreading device on the donkey hide gelatin is improved by the auxiliary device; the thickness of the donkey hide gelatin on the conveying device is limited by the leveling device, and the donkey hide gelatin after cooling is cut by the cutting device, thereby reducing the labor intensity of the operator and improving the practicability of the device.

[0007] Preferably, the conveying device includes a conveying frame, a first reducer, a first motor, a conveying roller, a conveyor belt and a baffle bar. A plurality of conveying rollers are horizontally installed on the upper part of the pot body, and the conveyor belt is mounted on the plurality of conveying rollers. A first reducer is installed on the front end surface of the conveying frame, and a first motor is installed on the first reducer. The output end of the first reducer passes through the conveying frame and is connected with the rightmost conveying roller. A group of baffle bars are respectively arranged on the front and back of the bearing surface of the conveyor belt. The first motor is turned on to transmit power to the conveying roller through the first reducer to drive the conveying roller to rotate, and the boiled donkey-hide gelatin slurry is carried by the cooperation of the plurality of conveying rollers and the conveyor belt. The donkey-hide gelatin slurry on the conveyor belt is intercepted by two groups of baffle bars to prevent the donkey-hide gelatin slurry from falling from the side of the conveyor belt, thereby improving the practicability of the device.

[0008] Preferably, the spreading device includes a support frame, a spreading bin, a plate-type solenoid valve and a baffle, the pot body is mounted on the upper end surface of the pot body through the support frame, the plate-type solenoid valve is mounted on the lower end surface of the spreading bin, the output end of the plate-type solenoid valve is connected to the spreading bin, the lower part of the spreading bin is provided with a rectangular discharge port, and the right part of the lower end surface of the discharge port is mounted with a baffle; after the donkey-hide gelatin is boiled, the plate-type solenoid valve is opened to release the donkey-hide gelatin in the pot body into the spreading bin, and then the donkey-hide gelatin falls from the rectangular discharge port at the lower part of the spreading bin to the upper end surface of the conveyor belt, and the donkey-hide gelatin is blocked by the baffle to prevent the conveyor belt from rotating too slowly, causing the donkey-hide gelatin slurry to overflow to the right, affecting the normal spreading of the donkey-hide gelatin slurry on the conveyor belt, thereby improving the practicability of the device and reducing the labor intensity of the operators.

[0009] Preferably, the auxiliary device includes a second reducer, a second motor and a two-way auger. The second reducer is installed on the side of the spreading bin, the second motor is installed on the second reducer, and a two-way auger is installed horizontally in the lower part of the spreading bin, and the output end of the second reducer passes through the spreading bin and is connected to the two-way auger; after the donkey-hide gelatin is discharged into the spreading bin, the second motor is turned on to transmit power to the two-way auger through the second reducer, driving the two-way auger to rotate, and the two-way auger's own structure and its own rotation are coordinated to evenly transport the donkey-hide gelatin slurry in the middle of the spreading bin to both sides of the spreading bin, so that the output of donkey-hide gelatin from the lower output end of the spreading bin is relatively uniform, thereby improving the spreading effect of the donkey-hide gelatin and the practicality of the device.

[0010] Preferably, the leveling device includes a first gantry, a first electric cylinder and a scraper. The first gantry is installed in the middle of the upper end surface of the pot body, and the first electric cylinder is installed on the upper end surface of the first gantry. The moving end of the first electric cylinder extends downward through the upper end surface of the first gantry. The scraper is installed on the moving end of the first electric cylinder. The scraper itself is V-shaped, and the left and right parts of the scraper are inclined backward. The distance between the lower end surface of the scraper and the upper end surface of the conveyor belt is controlled by controlling the elongation of the first electric cylinder, thereby controlling the thickness of the donkey-hide gelatin block. The scraper cooperates with the moving conveyor belt to assist in leveling the donkey-hide gelatin slurry on the conveyor belt. The scraper itself V-shaped structure makes the donkey-hide gelatin slurry higher than the lower end surface of the scraper converge to the middle of the scraper, thereby reducing the phenomenon of donkey-hide gelatin paste dripping from the front and back sides of the conveyor belt, thereby improving the practicability of the device.

[0011] Preferably, the cutting device includes a second door frame, a second electric cylinder, a pressure switch, a cutting knife, a limit light rod and an arc-shaped limit plate. The second door frame is installed on the left part of the upper end surface of the pot body, and the second electric cylinder is installed on the upper end surface of the second door frame. The moving end of the second electric cylinder passes through the upper end surface of the second door frame and extends downward. The cutting knife is connected to the moving end of the second electric cylinder through the pressure switch. A group of limit light rods are vertically connected to the front and back of the upper end surface of the cutting knife respectively. The upper part of the limit light rod passes through the upper end surface of the second door frame, and two groups of arc-shaped limit plates are respectively arranged on the left and right sides of the upper end surface of the second door frame. The two groups of arc-shaped limit plates are about the center of the upper end surface of the limit light rod. The inner side of the arc-shaped limit plate is in close contact with the inner side of the limit light rod; after the donkey-hide gelatin slurry is cooled down, the conveying device is cooperated to continuously control the second electric cylinder to repeatedly extend and retract, so that the cutting knife slices the donkey-hide gelatin on the conveyor belt. At the same time, the pressure on the moving end of the second electric cylinder during the cutting process is monitored by the pressure switch. When the pressure on the moving end of the second electric cylinder is greater than the preset value, the pressure switch controls the second electric cylinder to stop extending to prevent equipment damage. The limit light rod and the arc-shaped limit plate are used to limit the lifting process of the cutting knife, thereby reducing the vibration of the limit light rod itself during the process of cutting donkey-hide gelatin, thereby improving the stability and practicality of the device.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the cooked donkey-hide gelatin is received by a conveying device to provide space for cooling and spreading; the cooked donkey-hide gelatin slurry is released onto the conveying device by a spreading device; the spreading effect of the spreading device on the donkey-hide gelatin is improved by an auxiliary device; the thickness of the donkey-hide gelatin on the conveying device is limited by a leveling device; the donkey-hide gelatin after cooling is cut by a cutting device, thereby reducing the labor intensity of the operator and improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0014] Figure 2It is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 3 It is a second axonometric structural schematic diagram of the utility model;

[0016] Figure 4 It is a partial enlarged structural schematic diagram of the cutting device;

[0017] Figure 5 It is a partial enlarged structural schematic diagram of the auxiliary device;

[0018] Markings in the attached drawings: 1. pot body; 2. stirring motor; 3. conveyor frame; 4. first reducer; 5. first electric motor; 6. conveyor roller; 7. conveyor belt; 8. baffle; 9. support frame; 10. paving bin; 11. plate solenoid valve; 12. baffle; 13. second reducer; 14. second electric motor; 15. two-way auger; 16. first door frame; 17. first electric cylinder; 18. scraper; 19. second door frame; 20. second electric cylinder; 21. pressure switch; 22. cutting knife; 23. limit light rod; 24. arc limit plate. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Example 1

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The paving device is installed on the conveying device, the auxiliary device is installed on the paving device, and the leveling device is installed on the conveying device;

[0022] First, the donkey-hide gelatin is boiled and refined in the pot body 1. After the donkey-hide gelatin is boiled, the plate-type solenoid valve 11 releases the donkey-hide gelatin in the pot body 1 into the paving bin 10; at the same time, the second motor 14 is turned on to transmit power to the two-way auger 15 through the second reducer 13, driving the two-way auger 15 to rotate, and the two-way auger 15 rotates by coordinating its own structure to evenly transport the donkey-hide gelatin slurry in the middle of the paving bin 10 to both sides of the paving bin 10, and then the donkey-hide gelatin falls from the rectangular discharge port at the bottom of the paving bin 10 to the upper end surface of the conveyor belt 7, and then the first motor 5 is turned on to transmit power to the two-way auger 15. The temperature is transmitted to the conveyor roller 6 through the first reducer 4 to drive the conveyor roller 6 to rotate, and the boiled donkey-hide gelatin slurry is carried by the cooperation of multiple groups of conveyor rollers 6 and conveyor belts 7. At the same time, the distance between the lower end surface of the scraper 18 and the upper end surface of the conveyor belt 7 is controlled by controlling the elongation of the first electric cylinder 17, so that the scraper 18 can scrape the upper part of the donkey-hide gelatin slurry flat, thereby controlling the thickness of the donkey-hide gelatin block. After the temperature of the donkey-hide gelatin slurry drops to a suitable temperature, the second electric cylinder 20 is continuously controlled to repeatedly extend and retract in cooperation with the conveying device, so that the cutting knife 22 can slice the donkey-hide gelatin on the conveyor belt 7;

[0023] The conveying device includes a conveying frame 3, a first reducer 4, a first motor 5, a conveying roller 6, a conveying belt 7 and a baffle 8. A plurality of conveying rollers 6 are horizontally installed on the upper part of the pot body 1. The conveying belt 7 is sleeved on the plurality of conveying rollers 6. The first reducer 4 is installed on the front end surface of the conveying frame 3. The first motor 5 is installed on the first reducer 4. The output end of the first reducer 4 passes through the conveying frame 3 and is connected to the rightmost conveying roller 6. A group of baffles 8 are respectively arranged on the front and rear of the bearing surface of the conveying belt 7.

[0024] The paving device includes a support frame 9, a paving bin 10, a plate-type solenoid valve 11 and a baffle 12. The pot body 1 is mounted on the upper end surface of the pot body 1 through the support frame 9, the plate-type solenoid valve 11 is mounted on the lower end surface of the paving bin 10, the output end of the plate-type solenoid valve 11 is connected to the paving bin 10, and a rectangular discharge port is arranged at the lower part of the paving bin 10, and a baffle 12 is mounted on the right part of the lower end surface of the discharge port;

[0025] The auxiliary device includes a second reducer 13, a second motor 14 and a bidirectional auger 15. The second reducer 13 is installed on the side of the paving bin 10, the second motor 14 is installed on the second reducer 13, and the bidirectional auger 15 is installed horizontally at the lower part of the paving bin 10. The output end of the second reducer 13 passes through the paving bin 10 and is connected to the bidirectional auger 15.

[0026] The leveling device includes a first gantry 16, a first electric cylinder 17 and a scraper 18. The first gantry 16 is installed in the middle of the upper end surface of the pot body 1, and the first electric cylinder 17 is installed on the upper end surface of the first gantry 16. The moving end of the first electric cylinder 17 passes through the upper end surface of the first gantry 16 and extends downward. The scraper 18 is installed on the moving end of the first electric cylinder 17. The scraper 18 itself is V-shaped, and the left and right parts of the scraper 18 are tilted backwards.

[0027] First, the donkey-hide gelatin is boiled and refined in the pot body 1. After the donkey-hide gelatin is boiled, the plate-type solenoid valve 11 releases the donkey-hide gelatin in the pot body 1 into the paving bin 10; at the same time, the second motor 14 is turned on to transmit power to the two-way auger 15 through the second reducer 13, driving the two-way auger 15 to rotate, and the two-way auger 15 itself The structure of the self-structure of the double-directional auger 15 cooperates with its own rotation to uniformly transport the donkey-hide gelatin slurry in the middle of the paving bin 10 to both sides of the paving bin 10, and then the donkey-hide gelatin falls from the rectangular discharge port at the lower part of the paving bin 10 onto the upper end surface of the conveyor belt 7, and then the first motor 5 is turned on to transmit power to the conveyor roller 6 through the first reducer 4 to drive the conveyor roller 6 to rotate, and the boiled donkey-hide gelatin slurry is carried by multiple groups of conveyor rollers 6 and the conveyor belt 7. At the same time, the distance between the lower end surface of the scraper 18 and the upper end surface of the conveyor belt 7 is controlled by controlling the elongation of the first electric cylinder 17, so that the scraper 18 scrapes the upper part of the donkey-hide gelatin slurry flat, thereby controlling the thickness of the donkey-hide gelatin block.

[0028] Example 2

[0029] The improvement is based on the first embodiment, and includes a cutting device, which is installed on the conveying device;

[0030] The cooling donkey-hide gelatin is cut by the cutting device, which reduces the labor intensity of the operator and improves the practicality of the device;

[0031] After the temperature of the donkey-hide gelatin slurry is lowered, the second electric cylinder 20 is continuously controlled to repeatedly extend and retract in cooperation with the conveying device, so that the cutting knife 22 slices the donkey-hide gelatin on the conveyor belt 7. At the same time, the pressure on the moving end of the second electric cylinder 20 during the cutting process is monitored by the pressure switch 21. When the pressure on the moving end of the second electric cylinder 20 is greater than the preset value, the pressure switch 21 controls the second electric cylinder 20 to stop extending to prevent damage to the equipment. The lifting process of the cutting knife 22 is limited by the limiting light rod 23 and the arc-shaped limiting plate 24, which reduces the vibration of the limiting light rod 23 itself during the cutting process of donkey-hide gelatin, thereby improving the stability and practicality of the device.

[0032] The cutting device includes a second door frame 19, a second electric cylinder 20, a pressure switch 21, a cutting knife 22, a limiting light rod 23 and an arc-shaped limiting plate 24. The second door frame 19 is installed on the left part of the upper end surface of the pot body 1, and the second electric cylinder 20 is installed on the upper end surface of the second door frame 19. The moving end of the second electric cylinder 20 passes through the upper end surface of the second door frame 19 and extends downward. The cutting knife 22 is connected to the moving end of the second electric cylinder 20 through the pressure switch 21. A group of limiting light rods 23 are vertically connected to the front and back of the upper end surface of the cutting knife 22 respectively. The upper part of the limiting light rod 23 passes through the upper end surface of the second door frame 19, and two groups of arc-shaped limiting plates 24 are respectively arranged on the left and right sides of the upper end surface of the second door frame 19. The two groups of arc-shaped limiting plates 24 are symmetrical about the center of the circle of the upper end surface of the limiting light rod 23, and the inner side surface of the arc-shaped limiting plate 24 is in close contact with the inner side surface of the limiting light rod 23.

[0033] like Figures 1 to 5 As shown, the fully automatic donkey-hide gelatin block boiling machine of the utility model, when working, first boils and refines the donkey-hide gelatin in the pot body 1, and after the boiling of the donkey-hide gelatin is completed, the plate-type solenoid valve 11 releases the donkey-hide gelatin in the pot body 1 into the paving bin 10; at the same time, the second motor 14 is turned on to transmit power to the two-way auger 15 through the second reducer 13, driving the two-way auger 15 to rotate, and the two-way auger 15 itself rotates in coordination with its own structure to evenly transport the donkey-hide gelatin slurry in the middle of the paving bin 10 to both sides of the paving bin 10, and then the donkey-hide gelatin falls from the rectangular discharge port at the bottom of the paving bin 10 to the upper end surface of the conveyor belt 7, and then Then, the first motor 5 is turned on to transmit power to the conveying roller 6 through the first reducer 4 to drive the conveying roller 6 to rotate. The boiled donkey-hide gelatin slurry is carried by the cooperation of multiple groups of conveying rollers 6 and conveyor belts 7. At the same time, the distance between the lower end surface of the scraper 18 and the upper end surface of the conveyor belt 7 is controlled by controlling the elongation of the first electric cylinder 17, so that the scraper 18 can scrape the upper part of the donkey-hide gelatin slurry flat, thereby controlling the thickness of the donkey-hide gelatin block. After the temperature of the donkey-hide gelatin slurry drops to a suitable temperature, the second electric cylinder 20 is continuously controlled by the conveying device to repeatedly extend and retract, so that the cutting knife 22 can slice the donkey-hide gelatin on the conveyor belt 7.

[0034] The second electric cylinder 20, the first electric cylinder 17, the first reducer 4, the first motor 5, the pressure switch 21, the second reducer 13, the second motor 14 and the plate-type solenoid valve 11 of the fully automatic donkey-hide gelatin block boiling machine of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in this field to make creative efforts.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. Fully automatic donkey hide gelatin block boiling machine; characterized in that, It comprises a conveying device, a spreading device, an auxiliary device, a leveling device and a cutting device, wherein the spreading device is mounted on the output end of the pot body (1), the auxiliary device is mounted on the spreading device, the leveling device is mounted on the conveying device, and the cutting device is mounted on the conveying device.

2. The fully automatic donkey-hide gelatin block boiling machine according to claim 1, characterized in that: The conveying device comprises a conveying frame (3), a first reducer (4), a first motor (5), a conveying roller (6), a conveying belt (7) and a baffle (8); a plurality of conveying rollers (6) are horizontally mounted on the upper part of the pot body (1); the conveying belt (7) is sleeved on the plurality of conveying rollers (6); a first reducer (4) is mounted on the front end surface of the conveying frame (3); a first motor (5) is mounted on the first reducer (4); an output end of the first reducer (4) passes through the conveying frame (3) and is connected to the rightmost conveying roller (6); and a group of baffles (8) are respectively arranged on the front and rear of the bearing surface of the conveying belt (7).

3. The fully automatic donkey-hide gelatin block boiling machine as claimed in claim 2, characterized in that: The paving device comprises a support frame (9), a paving bin (10), a plate-type electromagnetic valve (11) and a baffle (12); the pot body (1) is mounted on the upper end surface of the pot body (1) via the support frame (9); the plate-type electromagnetic valve (11) is mounted on the lower end surface of the paving bin (10); the output end of the plate-type electromagnetic valve (11) is connected to the paving bin (10); a rectangular discharge port is arranged at the lower part of the paving bin (10); and a baffle (12) is mounted on the right part of the lower end surface of the discharge port.

4. The fully automatic donkey-hide gelatin block boiling machine as claimed in claim 3, characterized in that: The auxiliary device comprises a second reducer (13), a second motor (14) and a bidirectional auger (15); the second reducer (13) is installed on the side of the paving bin (10); the second motor (14) is installed on the second reducer (13); a bidirectional auger (15) is installed horizontally at the lower part of the paving bin (10); the output end of the second reducer (13) passes through the paving bin (10) and is connected to the bidirectional auger (15).

5. The fully automatic donkey-hide gelatin block boiling machine as claimed in claim 2, characterized in that: The leveling device comprises a first door frame (16), a first electric cylinder (17) and a scraper (18); the first door frame (16) is installed in the middle of the upper end surface of the pot body (1); the first electric cylinder (17) is installed on the upper end surface of the first door frame (16); the moving end of the first electric cylinder (17) passes through the upper end surface of the first door frame (16) and extends downward; the scraper (18) is installed on the moving end of the first electric cylinder (17); the scraper (18) itself is V-shaped, and the left and right parts of the scraper (18) are inclined backward.

6. The fully automatic donkey-hide gelatin block boiling machine as claimed in claim 2, characterized in that: The cutting device comprises a second door frame (19), a second electric cylinder (20), a pressure switch (21), a cutting knife (22), a limiting light rod (23) and an arc-shaped limiting plate (24). The second door frame (19) is installed on the left part of the upper end surface of the pot body (1), and the second electric cylinder (20) is installed on the upper end surface of the second door frame (19). The movable end of the second electric cylinder (20) passes through the upper end surface of the second door frame (19) and extends downward. The cutting knife (22) is connected to the second electric cylinder through the pressure switch (21). The movable end of the movable cylinder (20) is connected, and a group of limiting light rods (23) are vertically connected to the front and rear ends of the upper end surface of the cutting knife (22), the upper part of the limiting light rod (23) passes through the upper end surface of the second door frame (19), and two groups of arc-shaped limiting plates (24) are respectively arranged on the left and right sides of the upper end surface of the second door frame (19), the two groups of arc-shaped limiting plates (24) are symmetrical about the center of the upper end surface of the limiting light rod (23), and the inner side surface of the arc-shaped limiting plate (24) is in close contact with the inner side surface of the limiting light rod (23).