CN114617153B

CN114617153B - Automatic head removing device for crayfishes

Info

Publication number: CN114617153B
Application number: CN202210187712.3A
Authority: CN
Inventors: 漆发发; 漆梅芳; 姚华; 尹国华; 刘时旋
Original assignee: Hua Shan Technology Co ltd
Current assignee: Hua Shan Technology Co ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-11-11
Anticipated expiration: 2042-02-28
Also published as: CN114617153A

Abstract

The invention relates to the technical field of food processing equipment, and discloses an automatic crawfish head removing device which comprises a rack, wherein a pressing mechanism is arranged on the rack, a supporting plate is connected below the pressing mechanism in a sliding manner, the supporting plate comprises a head supporting plate and a rotating shaft fixed at the end part of the head supporting plate, a tail supporting plate is rotatably connected onto the rotating shaft, a sliding groove is formed in the rack, the head supporting plate is connected into the sliding groove in a sliding manner, an opening is formed in one end of the sliding groove, a driving mechanism for driving the head supporting plate to do linear reciprocating motion along the sliding groove is arranged at the bottom of the head supporting plate, a turnover mechanism is arranged on the rack, and the tail supporting plate is driven to turn over by the turnover mechanism after the driving mechanism drives the tail supporting plate to penetrate out of the opening. The invention has the following advantages and effects: the tail-stretching and tail-removing device is simple in structure, two actions of stretching and removing the tail of the shrimp can be achieved through the tail supporting plate, an operator only needs to place the head of the shrimp on the supporting plate, and operation is convenient.

Description

Automatic head removing device for crayfishes

Technical Field

The invention relates to the technical field of food processing equipment, in particular to an automatic crawfish head removing device.

Background

The crayfish meat is delicious, is a favorite food of people in summer, and has a plurality of crayfish products for convenient eating, wherein the crayfish tail products account for a large proportion. The processing factory usually adopts manual operation's mode to get rid of crayfish head, remains the shrimp tail, processes again, and efficiency is lower, and the shrimp meat loss is more, also is difficult to guarantee in the aspect of the health.

The Chinese patent with the granted publication number of CN108029740B discloses an automatic crayfish head and tail clamp removing device, which comprises a crayfish clamp removing device and a crayfish head and tail removing device; the crayfish forceps removing device comprises a crayfish head positioning mechanism and a forceps removing knife; the crayfish head and tail removing device comprises a head and tail removing device support and a head and tail removing mechanism, and the head and tail removing mechanism is installed on the head and tail removing device support. According to the device, the crayfish positioning mechanism and the head and tail removing mechanism are directly clamped by the driving mechanism, the crayfish shells are inconsistent in thickness, force control is improper, the crayfish is easy to damage, the crayfish tail flattening mechanism is not arranged, and when the crayfish tail curls, the head and tail removing mechanism is difficult to clamp the crayfish.

Disclosure of Invention

The invention aims to provide an automatic head removing device for crayfishes, which has the advantages that crayfishes are automatically unfolded and fit with the shapes of the crayfishes, the device is suitable for crayfishes of various sizes, and the shapes of the crayfishes are kept good.

The technical purpose of the invention is realized by the following technical scheme: the automatic clamping device comprises a frame, be equipped with hold-down mechanism in the frame, hold-down mechanism below sliding connection has the backup pad, the backup pad is by the head backup pad, fix the pivot at head backup pad tip, it is connected with the afterbody backup pad to rotate in the pivot, be equipped with the spout in the frame, head backup pad sliding connection is in the spout, spout one end is equipped with the opening, head backup pad bottom is equipped with its actuating mechanism who is straight reciprocating motion along the spout of drive, be equipped with tilting mechanism in the frame, actuating mechanism drive afterbody backup pad is worn out the back from the opening, tilting mechanism drive afterbody backup pad upset.

Through adopting above-mentioned technical scheme, when to processing crayfish, place the crayfish in the backup pad through manual work or automation, hold-down mechanism fixes the crayfish in the backup pad, the crayfish head is located the backup pad this moment, the afterbody is unsettled, then actuating mechanism drive backup pad removes to crayfish afterbody direction, the backup pad can be automatically with the crayfish afterbody exhibition flat when removing, the afterbody backup pad is worn out from the opening of spout simultaneously, then the upset of tilting mechanism drive afterbody backup pad, can drive the crayfish afterbody and overturn, realize the separation of head and the tail.

The invention is further provided with: the pressing mechanism comprises supporting rods located on two sides of the supporting plate, a pressing plate is hinged to the top of the supporting rod and comprises a connecting portion, a bending portion and a pressing portion, the connecting portion is hinged to the supporting rod, a limiting block is arranged on the supporting rod, a limiting groove for the limiting block to be embedded is formed in the connecting portion, the connecting portion is parallel to the horizontal plane when the limiting block is embedded into the limiting groove, a torsional spring is arranged at the position where the connecting portion is hinged to the supporting rod, the limiting groove is connected with the limiting block in a upwards overturning mode through the elastic driving connecting portion of the torsional spring, the bending portion forms a V-shaped feed inlet, and the pressing portion forms a splayed pre-pressing portion.

Through adopting above-mentioned technical scheme, the crayfish can follow the V-arrangement feed inlet and get into, then under pressure, the pressure strip upset downwards, and two kinks part, the crayfish follow V type feed inlet downstream, and the crayfish is placed the back in the backup pad, loosens the crayfish, and the torsional spring can drive two hold-down parts and be close to each other, and the shrimp back compresses tightly to fix the crayfish in the backup pad.

The invention is further configured as follows: the pressing mechanism further comprises two pressing rods which are connected to the rack in a sliding mode, a sleeve is sleeved at the upper end of each pressing rod, the sleeve is connected with the pressing rods through springs, rollers are connected to the sleeves in a rotating mode, and a pushing mechanism which pushes the rollers to be close to the pressing portion is arranged on the rack.

Through adopting above-mentioned technical scheme, hold-down mechanism still includes two compression rods, can drive the push nut when two-way lead screw rotates and be close to each other, and the push nut drives the gyro wheel on two compression rods and is close to each other, and the gyro wheel meets the back with the up end of clamping part, can exert decurrent power to the clamping part, makes the clamping part more firm with the crayfish is fixed, makes the head and the tail separation when being favorable to follow-up upset shrimp tail.

The invention is further configured as follows: the driving mechanism comprises a driving lead screw which is rotatably connected to the rack and drives the driving lead screw to rotate, a driving nut is connected to the driving lead screw in a threaded mode and fixedly connected with the bottom of the head supporting plate, a limiting block is arranged on the rack, the tail supporting plate penetrates out of the opening when the driving nut is connected with the limiting block, a microswitch is arranged on the limiting block, and the microswitch is electrically connected with the motor.

Through adopting above-mentioned technical scheme, the motor is linear motion through drive lead screw and drive nut drive head backup pad, and when afterbody backup pad was still in the spout, the head backup pad promoted the afterbody backup pad and removed together, and when drive nut met with the stopper, afterbody backup pad was whole to be worn out from the opening, and the stopper contacted with micro-gap switch this moment, and micro-gap switch control motor stall.

The invention is further configured as follows: the pushing mechanism comprises a bidirectional screw rod which is rotatably connected to the rack, two ends of the bidirectional screw rod are respectively in threaded connection with two pushing nuts, the pushing nuts are fixedly connected with the bottom of the pressing rod, the driving screw rod is close to one end of the bidirectional screw rod and is fixedly connected with a driving bevel gear, the bidirectional screw rod is fixedly connected with a driven bevel gear, and the driving bevel gear is meshed with the driven bevel gear.

Through adopting above-mentioned technical scheme, when the drive lead screw rotated, accessible drive bevel gear and driven bevel gear drove two-way lead screw and rotate to when making the backup pad remove, hold-down mechanism compressed tightly the cray, avoided the backup pad to drive the cray aversion.

The invention is further provided with: tilting mechanism includes the roll-over stand of fixed connection in the frame, it is connected with sector gear to rotate on the roll-over stand, sliding connection has the upset rack in the frame, drives the cylinder that linear reciprocating motion was followed to the rack, the upset rack meshes with sector gear mutually, the afterbody backup pad is close to sector gear one end fixedly connected with connecting rod, be equipped with the spline on the connecting rod, sector gear's axle center is provided with the keyway that supplies the spline embedding.

Through adopting above-mentioned technical scheme, when the cylinder drove the rack and is linear motion, the rack can arrive sector gear rotation, and when sector gear and afterbody backup pad linked to each other, sector gear can drive the upset of afterbody backup pad to unscrew the shrimp tail.

The invention is further provided with: the axle center fixedly connected with spliced pole of gear, two clamping bars of spliced pole lateral wall symmetry fixedly connected with, the last rotation of clamping bar is connected with the clamping gear, afterbody backup pad both sides are equipped with and press from both sides tight rack, press from both sides tight rack and press from both sides tight gear and mesh mutually, press from both sides tight gear axle center fixedly connected with and press from both sides tight lead screw, threaded connection has clamping nut on the tight lead screw, two fixedly connected with flexure strip between the clamping nut.

Through adopting above-mentioned technical scheme, when the spout was worn out to the afterbody backup pad, the tight rack of clamp and the tight gear of clamp of afterbody backup pad both sides engaged with, and when the gear did not rotate, the tight gear of clamp can make the afterbody backup pad keep the horizontality, avoided the afterbody backup pad to rotate at will. The tail supporting plate can drive the clamping gear to rotate while moving, so that the clamping screw rod is driven to drive the elastic sheet to move downwards, the shrimp tails are fixed on the tail supporting plate, and the subsequent overturning is facilitated to separate the shrimp tails.

The invention is further provided with: the tail support plate is obliquely provided with a shifting sheet, the shifting sheet is hinged to the tail support plate, a torsional spring is arranged at the joint of the shifting sheet and the tail support plate, the torsional spring drives the shifting sheet to be separated from the tail support plate, a limiting plate for limiting the overturning angle of the shifting sheet is arranged on the tail support plate, and the included angle formed by the shifting sheet and the tail support plate is 30-60 degrees.

Through adopting above-mentioned technical scheme, when afterbody backup pad removes to tilting mechanism direction, the plectrum is located shrimp tail bottom, can promote the shrimp tail, make the shrimp tail exhibition flat, after the shrimp tail is overturned and the separation of shrimp head, when the afterbody backup pad removes to shrimp head direction, afterbody backup pad and shrimp tail separation, the shrimp tail drops downwards, the plectrum does not receive behind the pressure of shrimp tail, the torsional spring drive plectrum lifts up, the afterbody backup pad continues to remove to shrimp head direction, the plectrum that lifts up can promote the shrimp head forward, make shrimp head and hold-down mechanism separate, then drop from the backup pad.

The invention has the beneficial effects that:

1. through setting up head backup pad and afterbody backup pad, the afterbody backup pad rotates with the head backup pad to be connected, when promoting the afterbody backup pad and remove, can the shrimp tail on the one hand flatten, and on the other hand afterbody backup pad can be connected with tilting mechanism, overturns the shrimp tail in the afterbody backup pad and realizes the separation of head and tail. The tail-stretching and tail-removing device is simple in structure, two actions of stretching and removing the tail of the shrimp can be achieved through the tail supporting plate, an operator only needs to place the head of the shrimp on the supporting plate, and operation is convenient.

2. Hold-down mechanism includes the pre-compaction portion that the pressure strip is constituteed, fixes the position of shrimp at first through pre-compaction portion, then further compresses tightly the shrimp head through the compression rod, when being convenient for the workman operation, does not drive the shrimp head when guaranteeing the tilting mechanism upset and rotates together, guarantees the stability of the device operation of decaptitating, improves the automatic efficiency of decaptitating of crayfish.

3. The afterbody backup pad still can drive the flexure strip and move down when flat shrimp tail is opened out, the size of the adaptable different shrimps of elasticity of flexure strip, and the flexure strip can be together with the afterbody backup pad with firm the cliping of shrimp tail, is favorable to unscrewing the shrimp tail when the upset.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the explosive structure of the present invention.

Fig. 3 is a schematic view of the pressing mechanism.

Fig. 4 is a schematic view of the bottom structure of the present invention.

Fig. 5 is an enlarged schematic view at a of fig. 4.

Fig. 6 is a schematic cross-sectional view of the present invention.

In the figure, 1, a frame; 2. a pressing mechanism; 21. a support bar; 22. a compression plate; 22a, a connecting part; 22b, a bending part; 22c, a pressing part; 23. a hold down bar; 24. a sleeve; 25. a roller; 3. a torsion spring; 4. a spring; 5. a pushing mechanism; 51. a bidirectional screw rod; 52. pushing the nut; 53. a drive bevel gear; 54. a driven bevel gear; 6. a chute; 7. a support plate; 71. a head support plate; 72. a tail support plate; 73. a rotating shaft; 8. a drive mechanism; 81. driving the screw rod; 82. a motor; 83. a drive nut; 9. a limiting block; 10. a microswitch; 11. a turnover mechanism; 111. a roll-over stand; 112. a sector gear; 113. turning over the rack; 114. a cylinder; 115. a connecting rod; 116. a spline; 117. a keyway; 12. connecting columns; 13. a clamping lever; 14. clamping the gear; 15. clamping the rack; 16. clamping the screw rod; 17. clamping the nut; 18. an elastic sheet; 19. a shifting sheet; 20. and a limiting plate.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It should be apparent that the described embodiments are only some 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 of the present invention without any inventive step, are within the scope of the present invention.

The embodiment is as follows: the utility model provides an automatic device of decaptitating of crayfish, as shown in fig. 1, 6, includes frame 1, is equipped with hold-down mechanism 2 in the frame 1, and hold-down mechanism 2 includes two spinal branch vaulting poles 21, and the bracing piece 21 top articulates there is pressure strip 22, and pressure strip 22 includes connecting portion 22a, kink 22b and the portion of compressing tightly 22c. Connecting portion 22a is articulated mutually with bracing piece 21, and connecting portion 22a and bracing piece 21 department of meeting are equipped with torsional spring 3, are equipped with stopper 9 on the bracing piece 21, are equipped with the spacing groove that supplies stopper 9 embedding on the connecting portion 22a, and during stopper 9 embedding spacing groove, connecting portion 22a is parallel with the horizontal plane, and torsional spring 3's elasticity drive spacing groove meets with stopper 9. Two kink 22b form the V-arrangement feed inlet, and when the crayfish head was put into from the V-arrangement feed inlet, two kink 22b separated under the pressure effect, made the crayfish can move down, and two portions 22c that compress tightly formed splayed prepressing portion, and the back is put down to the crayfish, and 3 drive two portions 22c that compress tightly of torsional spring are close to each other, and the prepressing portion that two portions 22c that compress tightly constitute can be fixed the crayfish head.

As shown in fig. 2 and 3, the pressing mechanism 2 further includes two 7-shaped pressing rods 23 slidably connected to the frame 1, a sleeve 24 is sleeved on the upper end of each pressing rod 23, the sleeve 24 is connected to the pressing rods 23 through springs 4, one end of the sleeve 24, which is far away from the pressing rods 23, is rotatably connected to a roller 25, and the frame 1 is provided with a pushing mechanism 5 for pushing the roller 25 to approach the pressing portion 22c. The pushing mechanism 5 pushes the roller 25 to be connected with the upper surface of the pressing part 22c, when the roller 25 is close to each other, downward force can be applied to the pressing part 22c, so that the pressing part 22c can more firmly fix the crayfish, and the crayfish head is prevented from rotating together when the crayfish tail is turned over.

As shown in fig. 1 and 2, a sliding groove 6 is provided between the two support rods 21, a support plate 7 is slidably connected in the sliding groove 6, the support plate 7 is composed of a head support plate 71, a rotating shaft 73 fixed at the end of the head support plate 71 and a tail support plate 72 rotatably connected to the rotating shaft 73, an opening is provided at one end of the sliding groove 6, the head support plate 71 and the tail support plate 72 can slide in the sliding groove 6 together, the tail support plate 72 can be completely penetrated out from the opening end, and the tail support plate 72 can be turned over around the rotating shaft 73 after being completely penetrated out.

As shown in fig. 4 and 5, a driving mechanism 8 for driving the head support plate 71 to perform reciprocating linear motion along the chute 6 is disposed at the bottom of the head support plate 71, the driving mechanism 8 includes a driving screw 81 rotatably connected to the frame 1, a motor 82 is fixedly connected to one end of the driving screw 81, a driving nut 83 is threadedly connected to the driving screw, the driving nut 83 is fixedly connected to the head support plate 71, and the motor 82 drives the head support plate 71 to move along the chute 6 when rotating. The rack 1 is provided with a limiting block 9, when the driving nut 83 is connected with the limiting block 9, the tail supporting rod 21 is completely penetrated out from the opening, the limiting block 9 is provided with a microswitch 10, the microswitch 10 is electrically connected with the motor 82, and when the limiting block 9 is contacted with the microswitch 10, the microswitch 10 controls the motor 82 to stop rotating, so that the supporting plate 7 is kept at a specific position.

As shown in fig. 4 and 5, the pushing mechanism 5 includes a bidirectional screw 51 rotatably connected to the frame 1, two pushing nuts 52 are threadedly connected to two ends of the bidirectional screw 51, the pushing nuts 52 are fixedly connected to the bottoms of the pressing rods 23, a driving bevel gear 53 is fixedly connected to one end of the driving screw 81 close to the bidirectional screw, a driven bevel gear 54 is fixedly connected to the bidirectional screw 51, the driving bevel gear 53 is engaged with the driven bevel gear 54, and when the motor 82 is started, the bidirectional screw can be driven to rotate, so that the two pressing rods 23 are driven to approach to or be away from each other.

As shown in fig. 2, a turnover mechanism 11 for driving the tail support plate 72 to turn over is arranged on the machine frame 1, the turnover mechanism 11 includes a turnover frame 111 fixedly connected to the machine frame 1, a sector gear 112 is rotatably connected to the turnover frame 111, the radian of the sector gear 112 is 180 °, a turnover rack 113 is slidably connected to the machine frame 1, a cylinder 114 for driving the turnover rack 113 to reciprocate along a straight line is fixed to the machine frame 1, the turnover rack 113 is engaged with the sector gear 112, and when the rack moves, the sector gear 112 can be driven to rotate. The tail support plate 727 is fixedly connected with a connecting rod 115 close to one end of the sector gear 112, the connecting rod 115 is provided with a spline 116, the axis of the sector gear 112 is provided with a key groove 117 for embedding the spline 116, when the tail support plate 72 moves towards the sector gear 112, the spline 116 is embedded into the key groove 11, and the sector gear 112 can drive the tail support plate 72 to overturn.

As shown in fig. 2, a connecting column 12 is fixedly connected to the axis of the gear, two clamping rods 13 are symmetrically and fixedly connected to the side walls of the connecting column 12, a clamping gear 14 is rotatably connected to each clamping rod 13, clamping racks 15 are arranged on two sides of the tail supporting plate 72, the clamping racks 15 are meshed with the clamping gears 14, a clamping screw 16 is fixedly connected to the axis of each clamping gear 14, a clamping nut 17 is connected to each clamping screw 16 in a threaded manner, and an elastic sheet 18 is fixedly connected between the two clamping nuts 17. When the tail support plate 72 moves towards the sector gear 112, the clamping rack 15 is meshed with the clamping gear 14, the clamping gear 14 rotates, the clamping gear 14 drives the clamping screw rod 16 to rotate, the clamping nut 17 is driven to move up and down, and the elastic sheet 18 is driven to fix the shrimp tail on the tail support plate 72.

As shown in fig. 6, the tail support plate 72 is provided with the shifting piece 19 in an inclined manner, the shifting piece 19 is hinged to the tail support plate 72, the torsion spring 3 is arranged at the joint of the shifting piece 19 and the tail support plate 72, the torsion spring 3 drives the shifting piece 19 to be separated from the tail support plate 72, the tail support plate 72 is provided with the limiting plate 20 for limiting the turning angle of the shifting piece 19, and the included angle formed by the shifting piece 19 and the tail support plate 72 is 30 °. When the crawfish is placed on the supporting plate 7, the crawfish downwards presses the shifting sheet 19, the tail supporting plate 72 does not influence the flattening tail when moving, the tail flattening tail is reversely facilitated to enable the tail to be flattened, after the tail and the head of the crawfish are separated, the tail supporting plate 72 moves towards the head of the crawfish, the shifting sheet 19 is lifted, the head of the crawfish can be removed from the pressing mechanism 2, and the next crawfish can be conveniently placed.

The working principle of the automatic crawfish head removing device is as follows: when the crayfish is processed, firstly, the crayfish head of the crayfish is placed into the pressing mechanism 2 from the V-shaped feeding hole through a manual or automatic device, the supporting plate 7 is completely positioned in the sliding groove 6 at the moment, the crayfish head of the crayfish is placed on the supporting plate 7, the crayfish tail is placed in a suspended mode, the pressing parts 22c of the pressing mechanism 2 are close to each other under the action of the torsion spring 3, and the position of the crayfish is fixed; then, the motor 82 is started, the motor 82 drives the support plate 7 to move towards the tail of the shrimp through the driving screw rod 81, and the tail support plate 72 can flatten the tail of the shrimp in the process of moving towards the tail of the shrimp from the bottom of the head of the shrimp, so that the tail of the shrimp is flatly laid on the tail support plate 72; when the motor 82 is started, the driving screw rod 81 can drive the bidirectional screw rod 51 to rotate, the pressing rods 23 on the bidirectional screw rod 51 are close to each other, the rollers 25 on the pressing rods 23 are connected with the upper surface of the pressing part 22c, and a downward force is applied to the pressing part 22c, so that the pressing part 22c further fixes the heads of the shrimps; when the driving screw rod 81 enables the driving nut 83 to be connected with the micro switch 10, the micro switch 10 controls the motor 82 to stop rotating, at this time, the tail supporting plate 72 is completely separated from the sliding groove 6, the tail supporting plate 72 is connected with the sector gear 112 through the spline 116, the clamping rack 15 on the tail supporting plate 72 drives the elastic sheet 18 to clamp the shrimp tail, the air cylinder 114 is started, the overturning rack 113 drives the sector gear 112 to rotate, the sector gear 112 drives the tail supporting plate 72 and the overturning mechanism 11 to overturn together, and the shrimp head is separated from the shrimp tail; thirdly, the air cylinder 114 drives the turnover mechanism 11 and the tail supporting plate 72 to return, the motor 82 is started, the motor 82 drives the tail supporting plate 72 to move towards the direction of the shrimp heads, the shrimp tails fall after losing the support, the shifting sheet 19 on the tail supporting plate 72 lifts up to shift the shrimp heads away from the supporting plate 7, and the separation of the shrimp heads and the shrimp tails is completed.

Claims

1. The utility model provides an automatic device of decaptitating of cray which characterized in that: comprises a rack (1), a pressing mechanism (2) is arranged on the rack (1), a supporting plate (7) is connected below the pressing mechanism (2) in a sliding manner, the supporting plate (7) is composed of a head supporting plate (71) and a rotating shaft (73) fixed at the end part of the head supporting plate (71), a tail supporting plate (72) is connected on the rotating shaft (73) in a rotating manner, a sliding groove (6) is arranged on the rack (1), the head supporting plate (71) is connected in the sliding groove (6) in a sliding manner, an opening is arranged at one end of the sliding groove (6), a driving mechanism (8) for driving the head supporting plate (71) to do linear reciprocating motion along the sliding groove (6) is arranged at the bottom of the head supporting plate, a turnover mechanism (11) is arranged on the rack (1), the driving mechanism (8) drives the tail supporting plate (72) to penetrate out from the opening, the turnover mechanism (11) drives the tail supporting plate (72) to turn over, the pressing mechanism (2) comprises supporting rods (21) positioned at two sides of the supporting plate (7), a pressing plate (22) is hinged with the top, the pressing plate (22) comprising a connecting part (22 a), a bending part (22 b) and a limiting block (9) hinged with a limiting block (21 a connecting part (9), be equipped with the confession on connecting portion (22 a) the spacing groove of stopper (9) embedding, during stopper (9) embedding spacing groove, connecting portion (22 a) are parallel with the horizontal plane, connecting portion (22 a) are equipped with torsional spring (3) with bracing piece (21) articulated department, the elasticity drive connecting portion (22 a) of torsional spring (3) upwards overturn and make spacing groove and stopper (9) meet, two kink (22 b) form the V-arrangement feed inlet, two compress tightly portion (22 c) and form the eight characters splenium in advance.

2. The automatic crawfish deheading device of claim 1, wherein: hold-down mechanism (2) still include two compression bar (23) of sliding connection in frame (1), compression bar (23) upper end has cup jointed sleeve (24), link to each other through spring (4) between sleeve (24) and compression bar (23), it is connected with gyro wheel (25) to rotate on sleeve (24), be equipped with on frame (1) and promote gyro wheel (25) to push mechanism (5) that portion (22 c) orientation is close to compressing tightly.

3. The automatic crawfish deheading device of claim 2, wherein: actuating mechanism (8) are including rotating drive lead screw (81) of connection in frame (1), drive lead screw (81) pivoted motor (82), threaded connection has drive nut (83) on drive lead screw (81), drive nut (83) and head backup pad (71) bottom fixed connection, be equipped with stopper (9) on frame (1), when drive nut (83) meet with stopper (9) mutually afterbody backup pad (72) are worn out from the opening, be equipped with micro-gap switch (10) on stopper (9), micro-gap switch (10) are connected with motor (82) electricity.

4. The automatic crawfish deheading device of claim 3, wherein: the pushing mechanism (5) comprises a bidirectional screw rod (51) rotatably connected to the rack (1), two ends of the bidirectional screw rod (51) are respectively in threaded connection with two pushing nuts (52), the pushing nuts (52) are fixedly connected with the bottom of the pressing rod (23), the driving screw rod (81) is close to one end of the bidirectional screw rod (51) and is fixedly connected with a driving bevel gear (53), the bidirectional screw rod (51) is fixedly connected with a driven bevel gear (54), and the driving bevel gear (53) is meshed with the driven bevel gear (54).

5. The automatic crawfish deheading device of claim 1, wherein: tilting mechanism (11) include roll-over stand (111) of fixed connection in frame (1), it is connected with sector gear (112) to rotate on roll-over stand (111), sliding connection has upset rack (113), drive upset rack (113) along linear reciprocating motion's cylinder (114) on frame (1), upset rack (113) meshes with sector gear (112) mutually, afterbody backup pad (72) are close to sector gear (112) one end fixedly connected with connecting rod (115), be equipped with spline (116) on connecting rod (115), the axle center of sector gear (112) is provided with keyway (117) that supply spline (116) embedding.

6. The automatic crawfish deheading device of claim 5, wherein: the axle center fixedly connected with spliced pole (12) of sector gear (112), two clamping bar (13) of spliced pole (12) lateral wall symmetry fixedly connected with, it is connected with clamping gear (14) to rotate on clamping bar (13), afterbody backup pad (72) both sides are equipped with presss from both sides tight rack (15), press from both sides tight rack (15) and press from both sides tight gear (14) and mesh mutually, press from both sides tight lead screw (16) of clamping gear (14) axle center fixedly connected with, threaded connection has clamping nut (17) on pressing from both sides tight lead screw (16), two fixedly connected with flexure strip (18) between clamping nut (17).

7. The automatic crawfish deheading device of claim 1, wherein: the tail supporting plate (72) is obliquely provided with a shifting sheet (19), the shifting sheet (19) is hinged to the tail supporting plate (72), a torsion spring (3) is arranged at the joint of the shifting sheet (19) and the tail supporting plate (72), the torsion spring (3) drives the shifting sheet (19) to be separated from the tail supporting plate (72), a limiting plate (20) for limiting the overturning angle of the shifting sheet (19) is arranged on the tail supporting plate (72), and the included angle formed by the shifting sheet (19) and the tail supporting plate (72) ranges from 30 degrees to 60 degrees.