CN112845079A

CN112845079A - Automatic walnut shell benevolence mixture air current sorter of changing

Info

Publication number: CN112845079A
Application number: CN202110203859.2A
Authority: CN
Inventors: 胡国玉; 陈旭东; 王濯; 赵腾飞; 李忠新; 周建平
Original assignee: Xinjiang University
Current assignee: Xinjiang University
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-05-28

Abstract

The invention discloses an automatic movable airflow separator for walnut shell and kernel mixtures, which comprises a vibrating feeder, an automatic material limiting and air adjusting device, a negative pressure fan, a diaphragma wood settling tank, a cyclone dust collector, an automatic height adjusting device for a walnut kernel discharge hole, a control cabinet and a walnut shell collecting device. The automatic material limiting and air adjusting device is arranged at a feeding hole, controls the size and the air speed of a material feeding hole of the walnut shells and kernels at different grades, enables the materials to flow into a shell and kernel separation cavity through an impurity removing system, collects walnut kernels from the lower end of a discharging hole through a negative pressure fan, and enables the walnut shells to enter a discharging box for collection through the separation cavity. The invention realizes the automatic control of the material flow and the required wind speed and wind quantity of the shell and kernel mixture with different grades, and is suitable for separating and collecting shells, kernels and diaphragma juglandis with different grades generated after the walnut is mechanically broken.

Description

Automatic walnut shell benevolence mixture air current sorter of changing

Technical Field

The invention relates to an agricultural product processing machine, in particular to equipment for separating shells, kernels and core-separating wood by using a gas flow method for a shell and kernel mixture generated after the shells of walnut machinery are broken, and belongs to the technical field of agricultural machinery.

Background

China is the first major country of walnut production in the world and has the largest planting area and yield. The walnut selling modes mainly comprise two modes of nut selling and finely and deeply processed product selling, and the finely and deeply processed walnut products can better meet the market demands and bring more economic benefits. In the process of walnut fine and deep processing, walnut shell breaking and kernel taking are the basis of walnut fine and deep processing, and at present, two types of manual shell breaking and kernel taking and mechanical shell breaking and sorting are mainly adopted. The existing manual shell breaking and kernel taking method has the problems of high labor intensity, low efficiency, high production cost, poor environmental sanitation, incapability of meeting the requirement of large-scale production and the like. The walnut after mechanical shell breaking forms a shell and kernel mixture with different grades, including shells, kernels, diaphragma juglandis, chippings and the like. The method comprises the steps of pretreating a walnut shell-kernel mixture, namely grading the shell-kernel mixture, grading the shells and kernels with the same size together, and then separating the shells and kernels, so that the efficient and accurate separation of the shell-kernel mixtures with different grades is realized, and the problem to be solved is solved.

At present, the airflow separation method is mainly applied to sorting agricultural grain materials, and has poor effect on airflow separation of walnut shell and kernel mixture after shell breaking. The separation device for walnut shell and kernel mixture on the market mainly has the following defects: 1. the existing separation equipment for walnut shell and kernel mixed materials is mostly designed by using a grain material winnowing theoretical method for reference, has poor use effect and is mainly embodied in that the kernel content in shells is high and the kernel content in kernels is high. 2. The prior airflow separation device mainly comprises two types, namely positive pressure airflow separation and negative pressure airflow separation, and the equipment adopting the positive pressure airflow separation has the main defects of single equipment structure, poor separation efficiency and result, and lack of a dust removal device, so that the environmental sanitation of a working space is poor. 3. The conventional walnut shell and kernel mixed material sorting equipment cannot meet the separation of shell and kernel mixtures of different grades in a single channel, mainly aims at realizing the accurate control of the feeding quantity and the required air quantity and air speed because the shell and kernel mixtures of different grades correspond to different feeding quantities and air quantity and air speed, and needs to manually adjust the size of a feeding hole and the air quantity and air speed required by the shell and kernel separation. 4. In the actual production process, the sorting effect of walnut shell and kernel materials with different grades is found to have great relation with the geometric length of the separation cavity and the relative position of the feed inlet of the separation chamber and the air inlet of the lower end face of the separation cavity, but the existing equipment is of a rigid structure and cannot be adjusted, so that the separation effect is influenced.

Disclosure of Invention

The invention aims to provide an automatic airflow separator for walnut shell and kernel mixtures, aiming at the shell and kernel mixtures with different grades generated after mechanical shell breaking of walnuts, so as to solve the problems in the background art and improve the efficiency and the precision of walnut shell and kernel mixture separation.

In order to achieve the purpose, the invention provides the following technical scheme:

an automatic airflow separator for walnut shell and kernel mixtures comprises a vibrating feeder, an automatic material limiting and air adjusting device, a diaphragma settling tank, a cyclone dust collector, an automatic walnut kernel discharge port height adjusting device, a circuit control cabinet, a walnut shell discharge box, a negative pressure fan and a frequency converter, wherein the vibrating feeder is provided with a damping spring and a vibrating motor, and the vibrating motor controls the amplitude and the frequency by the frequency converter so as to control the material flow of the walnut shell and kernel mixtures; the automatic material limiting and air regulating device is driven by a servo motor to rotate, the gear is meshed with a rack to move, the rack is fixed with a material limiting and air regulating plate, and the material limiting and air regulating plate moves in a guide rail; a star-shaped air-lock is arranged at the outlet of the core log, the dust removal pipeline is connected with a negative pressure fan, and the air outlet of the negative pressure fan is connected with a cyclone dust collector; the position of the walnut kernel outlet is controlled by an automatic heightening device, and the walnut kernel discharge port automatic heightening device is fixed on the lower end of the shell and kernel separation cavity; the separating chamber upper end is connected with the walnut shell discharge box, the air lock is installed to discharge box walnut shell export, install in the discharge box and keep off the material air regulating mechanism, discharge box air outlet end links to each other with negative-pressure air fan.

As a further scheme of the invention: the vibration motor and the negative pressure fan are provided with variable frequency speed regulators, the negative pressure fan is connected with a three-phase asynchronous motor, the vibration motor, the three-phase asynchronous motor and a control cabinet are electrically connected, the control cabinet is arranged on a rack, all mechanisms are fixed by a support, and the bottom end of the support is provided with a movable trundle, so that the transportation and the movement of equipment are facilitated.

As a further scheme of the invention: the equipment is provided with an impurity removal system which comprises an impurity removal fan, a diaphragma wood settling box and a cyclone dust collector. The dust removal device is characterized in that a perforated slide carriage is mounted at the upper end of the air inlet, the inclination angle of the slide carriage is about 50 degrees, vent holes with the diameter of about 3mm are uniformly distributed in the slide carriage, an impurity removal pipeline is connected with a diaphragma settling box, a star-shaped air shutter is mounted at the lower port of the diaphragma settling box, a dust removal pipeline is connected with a negative pressure fan, and an air outlet of the negative pressure fan is connected with a cyclone separator.

As a further scheme of the invention: the automatic material limiting and air adjusting device comprises a servo motor, a gear, a rack, a guide rail, a limiting rod, a limiting protection spring and a material limiting and air adjusting plate, wherein the servo motor drives the gear to rotate accurately, the gear is meshed with the rack to move, the rack is fixed with the movable material limiting and air adjusting plate, the material limiting and air adjusting plate can move in the guide rail in a reciprocating mode to complete the material limiting and air adjusting effect, and the limiting rod and the limiting protection spring protect the operation and the limiting stroke of the servo motor.

As a further scheme of the invention: the automatic height-adjusting device for the discharge hole of the walnut kernel is composed of a servo motor driving end, a gear, a fixed guide rail, a movable rack and a fixing piece. The automatic height-adjusting device is driven by a servo motor to drive a driving gear to rotate, a gear meshing rack is connected with a walnut kernel outlet through a fixing piece, and the walnut kernel outlet can reciprocate on a guide rail.

Compared with the prior art, the invention has the following advantages: (1) according to the invention, the materials are conveyed through the vibrating feeder, and the frequency and the amplitude of the vibrating motor are controlled through the frequency converter, so that the feeding amount of the walnut shell and kernel mixed materials with different grades is controlled, the factors of manual operation are reduced, and accurate volume fraction is ensured for the feeding amount of the walnut shell and kernel mixed materials with different grades. (2) According to the invention, the automatic material limiting and air adjusting device is designed and installed at the material feeding port, so that the material limiting and air adjusting effects can be completed in a single channel aiming at walnut shell and kernel materials of different grades. The automatic material limiting and air regulating device drives the gear to rotate accurately by the servo motor, so that the flow and the air speed of materials at the feeding hole are controlled, the walnut shell and kernel mixed materials with different grades can uniformly enter the separation cavity, and the separation precision is improved. (3) According to the invention, the impurity removal system is designed and installed in front of the shell and kernel separation cavity and comprises the split core wood collection device and the dust and dust collection device cyclone separator, so that the split core wood and dust impurities are separately collected, the whole process is in a negative pressure state, the dust outfield of equipment during working is avoided, the environmental sanitation of a working space is protected, meanwhile, the split core wood and the dust impurities are separately collected, the split core wood can be effectively recycled, and the subsequent process of extracting the split core wood by the existing equipment is reduced. (4) The equipment is fixed on a movable rack, and can be flexibly moved. (5) The automatic walnut kernel discharge port height adjusting device designed and installed in the invention optimizes the geometric length of the separation cavity, can adjust the relative position of the separation chamber feed port and the lower end face air inlet of the separation cavity in real time, ensures that the separation cavity can complete the separation of walnut shell and kernel mixed materials of different grades, improves the separation precision, increases the equipment function, and overcomes the defect that the rigid structure of the existing equipment cannot be adjusted.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a front view of the present invention.

FIG. 3 is a schematic illustration of a trash removal system.

Fig. 4 is a schematic structural diagram of an automatic material limiting and air adjusting device.

Fig. 5 is a schematic structural view of an automatic height-adjusting device for a discharge hole of walnut kernels.

Fig. 6 is a schematic diagram of the control circuit.

In the figure: 1. a vibratory feeder frame; 2. a damping spring; 3. a vibration motor; 4. a vibrating feeder; 5. an automatic material limiting and air adjusting device; 6. a slide carriage with holes; 7. an impurity removal pipeline; 8. the upper end of the separation cavity; 9. a walnut shell discharge box; 10. a material blocking and air adjusting mechanism; 11. a negative pressure fan; 12. a three-phase asynchronous motor; 13. fixing the frame; 14. a caster wheel; 15. discharging walnut kernels; 16. an air lock; 17. a control cabinet; 18. discharging walnut kernels; 19. an automatic height adjusting device; 20. the lower end of the shell-kernel separation cavity; 21. an air inlet; 22. a diaphragma settling tank; 23. a split wood outlet; 24. a star-shaped airlock; 25. a dust removal pipeline; 26. a three-phase asynchronous motor; 27. a negative pressure fan; 28. a cyclone dust collector; 29. and (5) a dust outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-6, the present invention provides the following technical solutions: an automatic movable airflow separator for walnut shell and kernel mixtures comprises a vibrating feeder 4, an automatic material limiting and air adjusting device 5, a diaphragma settling tank 22, a cyclone dust collector 28, an automatic walnut kernel discharge port height adjusting device 19, a circuit control cabinet 17, a walnut shell discharge box 9, negative pressure fans 11 and 27, wherein the vibrating feeder 4 is provided with a damping spring 2 and a vibrating motor 3, and the vibrating motor 3 controls the amplitude and the frequency by a frequency converter so as to control the material flow of the walnut shell and kernel mixtures; the automatic material limiting and air regulating device 5 drives a gear 5-2 to rotate by a servo motor 5-1, the gear 5-2 is meshed with a rack 5-3 to move, the rack 5-3 is fixed with a material limiting and air regulating plate 5-7, and the material limiting and air regulating plate 5-7 moves in a guide rail 5-4; a star-shaped air-lock 24 is arranged at the lower port 23 of the core wood settling box, a dust removal pipeline 25 is connected with a negative pressure fan 27, and an air outlet of the negative pressure fan 27 is connected with a cyclone dust collector 28; the position of the walnut kernel outlet 18 is controlled by an automatic heightening device 19, and the automatic heightening device 19 of the walnut kernel discharge port 18 is fixed on the lower end 20 of the shell and kernel separation cavity; separating chamber upper end 8 is connected with walnut shell discharge box 9, and walnut shell export 15 is installed and is closed wind ware 16, installs in the discharge box 9 and keeps off material air regulating mechanism 10, and walnut shell discharge box 9 air outlet end links to each other with negative-pressure air fan 11.

The vibration motor 3 and the negative pressure fan 11 are both provided with a variable frequency speed regulator, the

negative pressure fans

11 and 27 are connected with three-phase

asynchronous motors

12 and 26, the vibration motor 3, the three-phase

asynchronous motors

12 and 26 are electrically connected with a control cabinet 17, and the control cabinet 17 is arranged on the frame 13. All the mechanisms are fixed by a support 13, the bottom end of which is fitted with a movable castor 14. The equipment is provided with an impurity removal system which comprises an impurity removal fan 27, a core wood settling box 22 and a star-shaped air shutter 24 and a cyclone dust collector 28 which are arranged at the lower port 23 of the core wood settling box. The upper end of the air inlet 21 is provided with a perforated slide carriage 6, the inclination angle of the slide carriage 6 is about 50 degrees, the slide carriage 6 is uniformly provided with vent holes with the diameter of about 3mm, the impurity removal pipeline 7 is connected with the diaphragma settling tank 22, the diaphragma outlet 23 is provided with a star-shaped air shutter 24, the dust removal pipeline 25 is connected with a negative pressure fan 27, and the air outlet of the negative pressure fan 27 is connected with a cyclone dust collector 28.

The automatic material limiting and air adjusting device 5 comprises a servo motor 5-1, a gear 5-2, a rack 5-3, a guide rail 5-4, a limiting rod 5-5, a limiting protection spring 5-6 and a material limiting and air adjusting plate 5-7, wherein the servo motor 5-1 drives the gear 5-2 to rotate accurately, the gear 5-2 is meshed with the rack 5-3 to move, the rack 5-3 and the movable material limiting and air adjusting plate 5-7 are fixed together, the material limiting and air adjusting plate 5-7 can move in the guide rail 5-4 in a reciprocating mode to complete the material limiting and air adjusting functions, and the limiting rod 5-5 and the limiting protection spring 5-6 protect the operation and the stroke of the servo motor. The automatic height-adjusting device 19 for the discharge hole of the walnut kernel consists of a servo motor driving end 19-3, a gear 19-2, a fixed guide rail 19-3, a movable rack 19-5 and a fixing piece 19-1. The automatic height-adjusting device 19 is driven by a servo motor driving end 19-3 to drive a gear 19-2 to rotate, the gear 19-2 is meshed with a rack 19-5 and is connected with a walnut kernel outlet 18 through a fixing piece 19-1, and the walnut kernel outlet 18 can reciprocate on a guide rail 19-4.

The working principle of the invention is as follows: the shell and kernel mixture of different grades generated after the walnut is mechanically cracked is pretreated to finish the classification of the shell and kernel, then the shell and kernel mixture of the same grade is conveyed to a vibrating feeder 4 through a material conveying device, and a frequency converter controls the amplitude and the frequency of a vibrating motor 3 so as to control the material flow of the walnut shell and kernel mixture of different grades; the material reaches the feed inlet through the vibrating feeder 4, the automatic material limiting and air regulating device 5 arranged at the feed inlet drives the gear 5-2 to rotate accurately by the servo motor 5-1, the gear is meshed with the rack 5-3 to move, the movable material limiting and air regulating plate 5-7 is fixed with the rack, and then the material limiting and air regulating effects are completed in the guide rail 5-4; the negative pressure fan 27 sucks wind power from the air suction opening 21, then sucks the core wood, dust and slag in the shell and kernel mixture into the core wood settling box 22, the core wood falls into the lower end 23 of the settling box and is collected through the star-shaped air shutter 24, and the dust and the debris flow into the cyclone dust collector through the negative pressure fan 27 and are collected; the shell and kernel materials after impurity removal slide into a shell and kernel separation cavity through a slide carriage 6, a walnut kernel discharge port automatic height adjusting device 19 drives a gear 19-2 to rotate by a servo motor driving end 19-3, the gear 19-2 is meshed with a rack 19-5 and is connected with a walnut kernel outlet 18 through a fixing piece 19-1, the walnut kernel outlet 18 reciprocates on a guide rail 19-4, the geometric length of the separation cavity is adjusted in real time, the relative position of a separation chamber feed port and a lower end face air inlet of the separation cavity is controlled, the separation cavity can complete separation of walnut shell and kernel mixed materials of different grades, the walnut shells are sucked into a discharge box 9 under the action of a negative pressure winnowing fan 11, the walnut shells fall into a walnut shell outlet 15 by virtue of self gravity along with the rapid increase of the space of the discharge box and the reduction of wind power, the walnut shells are collected under the action of a wind closing device 16, and the material blocking and wind adjusting mechanism 10, and ending the whole working process.

The working principle of the control circuit is as follows: m1 represents the vibration motor 3; m2 represents a three-phase asynchronous motor 26; m3 represents a three-phase asynchronous machine 12; FU is a fuse, and realizes the short circuit and overcurrent protection; FR is a thermal relay to realize the overload protection of the motor; SB1 is the stop button of M1; SB2 is the stop button of M2; SB3 is the stop button of M3; KM1, KM2 and KM3 represent contactors of M1, M2 and M3, respectively; KM4, KM5 and KM6 represent variable frequency contactors for controlling the vibration frequency and amplitude of M1, and respectively control the feeding amounts of one-half shell-kernel mixed material, one-quarter shell-kernel mixed material and one-eighth shell-kernel mixed material; KM7, KM8 and KM9 represent wind speed variable frequency contactors for controlling M3, and respectively control the wind speed and the wind speed for separating one-half shell-kernel mixed material, one-quarter shell-kernel mixed material and one-eighth shell-kernel mixed material; KT represents a time relay; SB4, SB5 and SB6 are respectively the starting buttons of KM4, KM5 and KM 6; SB7, SB8 and SB9 are respectively the starting buttons of KM7, KM8 and KM 9; SB10 represents the start button of M2.

When in use, the method is operated according to the following steps:

the method comprises the following steps: firstly, separating the shell and the kernel of one half of walnut shell and kernel mixed material, and starting an automatic material limiting and air regulating device 5 to enable a material limiting and air regulating plate to move to a corresponding position; starting the automatic height-adjusting device 19 at the discharge port of the walnut kernel to adjust the outlet of the walnut kernel to the corresponding height;

step two: pressing a SB4 start button of the control cabinet 17, correspondingly controlling a variable frequency contactor KM4 of the vibration frequency and the vibration amplitude of one half of the walnut shell and kernel mixed material to be electrified, then closing a normally open contact corresponding to KM4, electrifying a contactor KM1 of M1, starting the vibration motor 3 to work,

step three: when the SB10 start button is pressed, the contactor KM2 of the M2 is electrified, the corresponding normally open contact is closed, the normally closed contact is disconnected, and the negative pressure fan 27 starts to work;

step four: pressing a start button of SB7 to correspondingly control the power on of the wind speed variable frequency contactor KM7 for one half of the walnut shell and kernel mixed material, then closing the normally open contact corresponding to KM7, powering on the contactor KM3 of M3, and starting the negative pressure fan 11;

step five: when the stop button SB1 is pressed, the vibration motor 3 stops working; the stop button SB2 is pressed, and the negative pressure fan 27 stops working; the negative pressure fan 11 stops operating when the stop button SB3 is pressed.

The separation process of the quarter walnut shell and kernel mixed material and the eighth walnut shell and kernel mixed material is the same as the above operation steps.

The control circuit has the following characteristics: 1. a variable frequency regulator is arranged in the vibration feeding system, so that the feeding quantity of shells and kernels of different grades can be controlled; 2. the fan is subjected to variable frequency regulation in the shell and kernel separation system, so that the separation of shells and kernels of different grades can be realized in a single channel; 3. each motor is provided with an emergency stop and start button, so that the safety production is ensured; 4. the shell and the kernel of the same grade are separated, and the motors of the three parts are designed with sequential protection, so that the condition 5 that a wrong button is pressed in actual production is avoided, and the design of delayed disconnection of M2 and M3 is realized under the condition that M1 is stopped first when the motor is stopped, and a power device is protected.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. An automated mobile walnut shell and kernel mixture air flow sorter comprising: vibrating feeder (4), automatic material limiting and air adjusting device (5), split core wood settling tank (22), cyclone (28), walnut kernel discharge gate automatic height adjusting device (19), circuit control cabinet (17), walnut shell discharge box (9), negative-pressure air fan (11, 27), its characterized in that: the vibration feeder (4) is provided with a damping spring (2) and a vibration motor (3), and the vibration motor (3) controls the amplitude and the frequency by a frequency converter so as to control the material flow of the walnut shell and kernel mixture; the automatic material limiting and air regulating device (5) is driven by a servo motor (5-1) to drive a gear (5-2) to rotate, the gear (5-2) is meshed with a rack (5-3) to move, the rack (5-3) is fixed with a material limiting and air regulating plate (5-7), and the material limiting and air regulating plate (5-7) moves in a guide rail (5-4); a star-shaped air-lock device (24) is arranged at the lower port (23) of the core wood settling box, a dust removal pipeline (25) is connected with a negative pressure fan (27), and an air outlet of the negative pressure fan (27) is connected with a cyclone dust collector (28); the position of the walnut kernel outlet (18) is controlled by an automatic height-adjusting device (19), and the automatic height-adjusting device (19) of the walnut kernel discharge port (18) is fixed on the lower end (20) of the shell-kernel separation cavity; separation chamber upper end (8) are connected with walnut shell discharge box (9), air lock (16) are installed in discharge box walnut shell export (15), install in discharge box (9) and keep off material air regulating mechanism (10), discharge box (9) air outlet end links to each other with negative-pressure air fan (11).

2. An automated mobile airflow sorter for walnut shell and kernel mixtures according to claim 1 further comprising: vibrating motor (3) and negative-pressure air fan (11) have all installed the variable frequency speed regulator, and negative-pressure air fan (11, 27) are connected with three-phase asynchronous machine (12, 26), just vibrating motor (3), three-phase asynchronous machine (12, 26) and switch board (17) electric connection, install in frame (13) switch board (17).

3. An automated mobile airflow sorter for walnut shell and kernel mixtures according to claim 1 further comprising: all the mechanisms are fixed by a support (13), and the bottom end of the support is provided with a movable caster (14).

4. An automated mobile airflow sorter for walnut shell and kernel mixtures according to claim 1 further comprising: the equipment is provided with an impurity removal system which comprises an impurity removal fan (27), a core wood settling box (22) and a star-shaped air shutter (24) and a cyclone dust collector (28) which are arranged at the lower port (23) of the core wood settling box.

5. An automated mobile airflow sorter for walnut shell and kernel mixtures according to claim 3 wherein: the dust removal device is characterized in that a perforated slide carriage (6) is installed at the upper end of the air inlet (21), the inclination angle of the slide carriage (6) is about 50 degrees, the vent holes with the diameter of 3mm are uniformly distributed in the slide carriage (6), an impurity removal pipeline (7) is connected with a centering wood settling box (22), a centering wood outlet (23) is provided with a star-shaped air shutter (24), a dust removal pipeline (25) is connected with a negative pressure fan (27), and an air outlet of the negative pressure fan (27) is connected with a cyclone dust collector (28).

6. The automatic material limiting and air regulating device (5) comprises a servo motor (5-1), a gear (5-2), a rack (5-3), a guide rail (5-4), a limiting rod (5-5), a limiting protection spring (5-6) and a material limiting and air regulating plate (5-7), and is characterized in that: the servo motor (5-1) drives the gear (5-2) to rotate accurately, the gear (5-2) is meshed with the rack (5-3) to move, the rack (5-3) is fixed with the movable material limiting and air adjusting plate (5-7), the material limiting and air adjusting plate (5-7) can move in a reciprocating mode in the guide rail (5-4) to complete the material limiting and air adjusting functions, and the limiting rod (5-5) and the limiting protection spring (5-6) protect the operation and the stroke limiting of the servo motor.

7. The automatic height adjusting device (19) for the discharge port of the walnut kernel according to claim 1 is composed of a servo motor driving end (19-3), a gear (19-2), a fixed guide rail (19-3), a movable rack (19-5) and a fixing piece (19-1), and is characterized in that: the automatic height adjusting device (19) is driven by a servo motor driving end (19-3) to drive the gear (19-2) to rotate, the gear (19-2) is meshed with the rack (19-5) and is connected with the walnut kernel outlet (18) through a fixing piece (19-1), and the walnut kernel outlet (18) can reciprocate on the guide rail (19-4).