CN212664058U - A lamp body detects injecting glue equipment for equipment in LED lamp area - Google Patents

Abstract

The invention relates to a lamp shell detection glue injection device for LED lamp strip assembly, which comprises an upper conveying groove, wherein a contact piece position detection device, a size detection device and a glue injection device are sequentially arranged below a cover plate of the conveying groove along the conveying direction, intercepting devices capable of penetrating into the conveying groove and intercepting a main body are uniformly arranged on a rear side plate of the conveying groove, the distance between every two adjacent intercepting devices is consistent with that between every two adjacent lamp bead grooves, the glue injection device comprises a glue injection lifting cylinder and a glue injection box which are arranged below the cover plate of the conveying groove, a glue injection lifting seat is connected below the glue injection lifting cylinder, a glue injection box capable of being inserted into the lamp bead grooves is connected below the glue injection lifting seat, the glue injection box is communicated with the glue injection box through a glue injection hose, a glue injection pump communicated with an inner cavity of the glue injection box is embedded in a lower bottom plate of the glue injection box, a glue injection baffle plate is arranged on the outer side of the glue injection box, and the baffle plate is a deformable plate, and the outer dimension of which is larger than the dimension of the lamp bead groove.

Description

A lamp body detects injecting glue equipment for equipment in LED lamp area

Technical Field

The invention relates to the field of LED lamp processing equipment, in particular to lamp shell detection glue injection equipment for LED lamp strip assembly.

Background

With the development of the technology, the application of the LED lamp is more and more extensive, wherein the LED lamp strip is a commonly used LED lamp, which comprises a lamp housing as shown in fig. 1, the lamp housing comprises a main body 1, a circuit board is arranged inside the main body 1 and connected with two binding posts 5 at the front side of the main body 1, a lamp bead groove 2 matched with the LED lamp bead is uniformly arranged at the upper part of the main body 1, meanwhile, a contact sheet groove 3 is also arranged on the main body 1, a contact sheet 4 matched with the position of the lamp bead groove 2 is arranged in the contact sheet groove 3, the contact sheet 4 is communicated with the circuit board and is used for electrically communicating with the lamp beads put in the lamp bead groove 2, each lamp bead is connected in parallel, when the lamp bead is assembled with the lamp bead, the position condition of the contact sheet and the specific size of the lamp bead groove are detected, and then the glue can be injected into the lamp bead groove 2 according to the specific size, thereby ensuring the stability of the assembled lamp bead and the lamp, the prior art is operated manually, the efficiency is low, and the glue injection amount cannot be controlled.

Disclosure of Invention

The invention aims to provide a lamp shell detection glue injection device for LED lamp strip assembly, which can realize continuous detection glue injection operation, and can control the liquid level after glue injection through the specific structural design of a glue injection device so as to ensure accurate glue injection.

In order to achieve the above purpose, the invention adopts the technical scheme that: a lamp shell detection glue injection device for LED lamp strip assembly comprises a conveying groove with a cover plate at the upper part, wherein a conveying device is arranged at the bottom of the conveying groove, a contact plate position detection device, a size detection device and a glue injection device are sequentially arranged below the cover plate of the conveying groove along the conveying direction, the distance between the contact plate position detection device and the size detection device is integral multiple of the distance between adjacent lamp bead grooves on a main body, intercepting devices capable of penetrating into the conveying groove and intercepting the main body are uniformly arranged on a rear side plate of the conveying groove, the distance between the adjacent intercepting devices and the distance between the adjacent lamp bead grooves are consistent, the glue injection device comprises a glue injection lifting cylinder and a glue injection box which are arranged below the cover plate of the conveying groove, a glue injection lifting seat is connected below the glue injection lifting cylinder, a glue injection box capable of being inserted into the lamp bead grooves is connected below the glue injection lifting seat, the glue injection box is communicated with the glue injection box through a glue injection hose, a glue injection pump communicated with an inner cavity of the glue injection box is embedded in a lower bottom plate of the glue injection box, a glue injection intercepting plate is arranged on the outer side of the glue injection box, the glue injection intercepting plate is a plate deformable under stress, the outer size of the plate is larger than that of the lamp bead groove, and a glue injection limiting column for limiting the maximum descending position of the plate is arranged below the glue injection lifting seat.

Preferably, the below of injecting glue lift seat be provided with the injecting glue post, the injecting glue post be the cavity post, lower extreme and injecting glue box intercommunication, injecting glue chute intercommunication in upper end and the injecting glue lift seat, injecting glue chute and injecting glue case pass through the injecting glue hose intercommunication, the injecting glue box in be provided with the electric heat piece, and the outside of injecting glue box, injecting glue post and the downside of injecting glue lift seat are provided with the card spool, the card spool is not in the homonymy with injecting glue chute.

Preferably, size detection device including setting up the size detection lift cylinder in conveyer trough apron below, size detection lift cylinder below be connected with the size detection box, the lower surface embedding of size detection box have the size to detect the response screen, the size detection response screen be square annular structure, the inner ring size is less than the lamp pearl groove, the outer ring size is greater than the lamp pearl groove, and the size detection response screen can be sent the sensing signal who forms for picture analysis module with the form of picture, whether the size through picture analysis module analysis lamp pearl groove is qualified.

Preferably, the size detection box in set up the degree of depth detection spring of vertical trend, the degree of depth detection spring on be provided with the degree of depth and detect the piece, degree of depth detect piece below be provided with can wear out the degree of depth detection pole that the size detection box, the interior upper portion of size detection box be provided with the degree of depth and detect down the air cylinder, the degree of depth detect down the air cylinder connect can push down the degree of depth detection piece and detect briquetting down, the interior upper portion of size detection box still be provided with vertical direction and with degree of depth detection piece complex distancer.

Preferably, the size detection box is internally provided with a contact groove depth detection needle which can penetrate out of the size detection box and is matched with the bottom of the contact groove, the end part of the contact groove depth detection needle in the size detection box is provided with a magnetic grid reading head, and the inner wall of the size detection box is provided with a magnetic grid ruler which moves vertically and is matched with the magnetic grid reading head.

Preferably, the contact groove depth detection needles are provided with two groups and are symmetrical about the center of the size detection box, and each contact groove depth detection needle is matched with a magnetic grid reading head and a magnetic grid ruler.

Preferably, contact position detection device including setting up the position detection lift cylinder in conveyer trough apron below, the position detection lift cylinder be connected with the position and detect the elevator, the below that the position detected the elevator be provided with two respectively with two contact position complex position detection posts of lamp pearl groove both sides, and position detection post below is connected with the position and detects the inductor, the position detect the inductor for the contact inductor, and two position detection posts are about the axis symmetry of position detection lift cylinder.

Preferably, contact position detection device still including setting up position detection motor and the position detection lead screw in conveyer trough apron below, the position detection lead screw cooperate and have the position to detect the movable block, the position detect lift cylinder setting in the below of position detection movable block, the position detect the inductor for can produce the contact induction signal's contact inductor respectively to lower bottom surface and lateral surface.

Drawings

Fig. 1 is a top view of a light strip;

fig. 2 is a schematic structural diagram of a lamp housing detection glue injection device for assembling an LED lamp strip;

FIG. 3 is a schematic structural diagram of a wafer position detecting device;

FIG. 4 is a schematic structural diagram of a size detection apparatus;

FIG. 5 is an enlarged view of a portion of A in FIG. 4;

FIG. 6 is a schematic structural view of the glue injection device;

fig. 7 is a schematic structural view of the glue injection part.

The text labels shown in the figures are represented as: 1. a main body; 2. a lamp bead groove; 3. a contact sheet groove; 4. a contact piece; 11. A conveying trough; 12. a conveying device; 13. an intercepting device; 14. a contact position detecting device; 16. a size detection device; 17. a glue injection device; 31. a position detection motor; 32. a position detection screw rod; 33. a position detection movable block; 34. a position detection lifting cylinder; 35. a position detection lifting block; 36. a position detection lifting guide rod; 37. a position detection column; 38. a position detection sensor; 51. a size detection lifting cylinder; 52. a size detection box; 53. a depth detection spring; 54. a depth detection block; 55. a depth detection rod; 56. deeply detecting a pressing cylinder; 57. a lower pressing block is detected in depth; 58. a range finder; 59. a size detection induction screen; 60. a contact groove depth detection pin; 61. a magnetic grid ruler; 62. a magnetic grid read head; 71. a glue injection lifting cylinder; 72. injecting glue lifting seat; 73. injecting a glue box; 74. injecting glue to limit the column; 75. a glue injection chute; 76. injecting a glue column; 77. injecting a glue box; 78. a glue injection pump; 79. glue injection blocking plates; 80. an electric heating block; 81. a wire clamping pipe.

Detailed Description

The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.

As shown in fig. 1-2 and fig. 6-7, the specific structure of the present invention is: a lamp shell detection glue injection device for LED lamp strip assembly comprises a conveying groove 11 with a cover plate on the upper portion, a conveying device 12 is arranged at the bottom of the conveying groove 11, a contact position detection device 14, a size detection device 16 and a glue injection device 17 are sequentially arranged below the cover plate of the conveying groove 11 along the conveying direction, the distance between the contact position detection device and the size detection device is integral multiple of the distance between adjacent lamp bead grooves 2 on a main body 1, intercepting devices 13 capable of penetrating into the conveying groove 11 and intercepting the main body 1 are uniformly arranged on the rear side plate of the conveying groove 11, the distance between the adjacent intercepting devices 13 and the distance between the adjacent lamp bead grooves 2 are consistent, the glue injection device 17 comprises a glue injection lifting cylinder 71 and a glue injection box 73 which are arranged below the cover plate of the conveying groove 11, a glue injection lifting seat 72 is connected below the glue injection lifting cylinder 71, a glue injection box 77 capable of being inserted into the lamp bead grooves 2 is connected below the glue injection lifting seat 72, the glue injection box 77 is communicated with the glue injection box 73 through a glue injection hose, a glue injection pump 78 communicated with an inner cavity of the glue injection box 77 is embedded in a lower bottom plate of the glue injection box 77, a glue injection interception plate 79 is arranged on the outer side of the glue injection box 77, the glue injection interception plate 79 is a plate deformable under stress, the outer size of the plate is larger than that of the lamp bead groove 2, and a glue injection limiting column 74 limiting the maximum descending position of the glue injection lifting seat 72 is arranged below the glue injection lifting seat.

When the device is used, in the initial state, the first intercepting device intercepts the state, then the lamp shell is placed into the conveying groove 11, the lamp shell is driven to move along with the starting of the conveying device 12 until the lamp shell is intercepted by the intercepting device, the conveying of the conveying device 12 is stopped, so that the first lamp bead groove 2 can be ensured to be accurately positioned at the contact piece position detection station, whether the position of the contact piece 4 is accurate is detected through the contact piece position detection device 14, if the position is not accurate, the subsequent detection of the lamp bead groove 2 is not carried out, then the first intercepting device is returned to the original position, the second intercepting device is positioned in the intercepting state, then the conveying device 12 is started, so that the second lamp bead groove 2 is subjected to the contact piece position detection station, the conveying operation is repeated, the lamp bead grooves sequentially and accurately pass through the contact piece position detection station, the size detection station and the glue injection station, and the continuous glue injection detection operation is realized, each side of the size of the glue injection blocking plate 79 is 5-10mm larger than that of the lamp bead groove, when glue injection is carried out, the glue injection lifting cylinder 71 drives the glue injection lifting seat 72 to descend until the glue injection limiting column 74 is blocked by the main body 1, the glue injection box 77 at the moment is positioned in the lamp bead groove 2, the edge of the glue injection blocking plate 79 is deformed and then is positioned in the lamp bead groove 2, glue injection is carried out on the lamp bead groove 2 through the glue injection pump 78, and due to the design of the glue injection blocking plate, the liquid level of the glue injection can be limited, and accurate glue injection can be achieved.

As shown in fig. 6-7, a glue injection column 76 is arranged below the glue injection lifting seat 71, the glue injection column 76 is a hollow column, the lower end of the hollow column is communicated with a glue injection box 77, the upper end of the hollow column is communicated with a glue injection chute 75 in the glue injection lifting seat 72, the glue injection chute 75 is communicated with the glue injection box 73 through a glue injection hose, an electric heating block 80 is arranged in the glue injection box 77, and a wire clamping pipe 81 is arranged on the outer side of the glue injection box 77, the outer side of the glue injection column 76 and the lower side of the glue injection lifting seat 72, and the wire clamping pipe 81 and the glue injection chute 75 are not on the same side.

Through the design of injecting glue post 76 and injecting glue chute 75, set up card spool 81 simultaneously, and then can ensure that in the lift process, the winding can not appear in injecting glue hose and wire, through the electric heat piece 80 in the injecting glue box 77, can ensure that the glue solution is in the liquid state.

As shown in fig. 4-5, the size detection device 16 includes a size detection lifting cylinder 51 disposed below the cover plate of the conveying chute 11, a size detection box 52 is connected below the size detection lifting cylinder 51, a size detection induction screen 59 is embedded in the lower surface of the size detection box 52, the size detection induction screen 59 is a square ring structure, the size of the inner ring is smaller than that of the lamp bead slot 2, the size of the outer ring is larger than that of the lamp bead slot 2, the size detection induction screen 59 can send the formed induction signal to the picture analysis module in the form of a picture, and the picture analysis module analyzes whether the size of the lamp bead slot 2 is qualified or not.

Size detection is mainly detected the size in lamp pearl groove, it drives the decline of size detection box 52 to detect lift cylinder 51 through the size, and then the bottom of size detection box 52 can contact the upper surface of main part 1, meanwhile, size detection response screen 59 equally can contact the upper surface of main part 1, and produce the contact induction signal with the part of contact, and will produce induction signal's part and form the picture, so, produce induction signal and do not produce induction signal's boundary portion and be the shape and the size in lamp pearl groove promptly, compare through the standard picture with picture analysis module, can feed back whether qualified of the size in lamp pearl groove 2.

As shown in fig. 4-5, a depth detection spring 53 extending vertically is disposed in the size detection box 52, a depth detection block 54 is disposed on the depth detection spring 53, a depth detection rod 55 capable of penetrating through the size detection box 52 is disposed below the depth detection block 54, a depth detection pressing cylinder 56 is disposed at an inner upper portion of the size detection box 52, the depth detection pressing cylinder 56 is connected to a depth detection pressing block 57 capable of pressing down the depth detection block 54, and a distance measuring device 58 which is vertically disposed at the inner upper portion of the size detection box 52 and is matched with the depth detection block 54 is further disposed.

When size detection box 52 is intercepted by main part 1, it drives the descending briquetting 57 of degree of depth detection to push down cylinder 56 through degree of depth detection and descends, and then can push down degree of depth detection piece 54, and then can make degree of depth detection pole 55 descend until blockking by the tank bottom of lamp pearl groove 2, calculate the height of degree of depth detection piece 54 through distancer 58 this moment, can convert the degree of depth of lamp pearl groove 2 into, and then carry out degree of depth detection to lamp pearl groove 2, and in follow-up injecting glue process, can calculate reasonable injecting glue volume according to specific degree of depth condition, avoid because the injecting glue process causes the extruded condition to the injecting glue sideboard.

As shown in fig. 4-5, a contact groove depth detecting pin 60 is further disposed in the size detecting box 52, and can penetrate through the size detecting box 52 and engage with the bottom of the contact groove 3, a magnetic grating reading head 62 is disposed at an end of the contact groove depth detecting pin 60 in the size detecting box 52, and a magnetic grating ruler 61 which extends vertically and engages with the magnetic grating reading head 62 is disposed on an inner wall of the size detecting box 52.

When carrying out lamp pearl groove size detection, contact groove degree of depth detects needle 60 can be intercepted by contact groove 3, and then can carry out the size measurement through magnetic grid read head 62 cooperation magnetic grid chi 61, and then can convert the degree of depth that the contact groove into, realizes the degree of depth detection to the contact groove.

As shown in fig. 5, the contact groove depth detecting pins 60 are provided in two sets, and are symmetrical with respect to the center of the size detecting box 52, and each contact groove depth detecting pin 60 is fitted with a magnetic grating reading head 62 and a magnetic grating scale 61.

The design of two sets of symmetrically arranged contact groove depth detection needles 60 can ensure the accuracy of contact groove depth detection.

As shown in fig. 3, the contact position detecting device 14 includes a position detecting lifting cylinder 34 disposed below the cover plate of the conveying trough 11, the position detecting lifting cylinder 34 is connected with a position detecting lifting block 35, two position detecting posts 37 respectively matched with the two contacts 4 on two sides of the bead trough 2 are disposed below the position detecting lifting block 35, a position detecting sensor 38 is connected below the position detecting posts 37, the position detecting sensor 38 is a contact sensor, and the two position detecting posts 37 are symmetrical with respect to the axis of the position detecting lifting cylinder 34.

Because the lamp pearl is the normalization preparation, consequently its patch pin length is certain, consequently the position of contact can directly influence the lamp pearl whether can communicate with the circuit board, need detect, the position through setting for position detection post 37 is in the patch pin outermost end of putting into the lamp pearl in the lamp pearl groove directly over, so can drive through detecting lift cylinder 34 and detect elevator block 35 and descend, and then make position detection post 37 descend, under the general condition, two position detection inductors 38 all produce the contact sensing signal and show that the contact position is qualified promptly, otherwise only one produces the contact sensing signal and the position of another contact in surface is unqualified.

As shown in fig. 3, the contact position detecting device 14 further includes a position detecting motor 31 and a position detecting screw rod 32 disposed below the cover plate of the conveying chute 11, the position detecting screw rod 32 is engaged with a position detecting movable block 33, the position detecting lifting cylinder 34 is disposed below the position detecting movable block 33, and the position detecting sensor 38 is a contact sensor capable of generating contact sensing signals for the lower bottom surface and the outer side surface, respectively.

There may be an extreme case of prior contact position detection, i.e. when both detection sensors 38 generate a touch-sensitive signal, the positions of the two contact pieces are not qualified (the situation is particularly rare), and the structure is arranged for omnibearing detection, in the initial state, the position detection lifting cylinder 34 is located right above the center of the lamp bead slot 2, when the bottom surfaces of the two position detection sensors 38 generate sensing signals, the position detection motor 31 drives the position detection screw rod 32 to rotate, thereby moving the position detection movable block 33, and thus the position detection sensor 38, if the contact sensor on the outer side surface generates a sensing signal in the moving process, the position of the two contact pieces is not qualified, if the contact sensor at the outer side does not generate a sensing signal, the positions of the two contact pieces are qualified.

Each detection station of this application can be controlled alone through respective operating panel and operating button, also can control all detection device and injecting glue device through an automatic control system to can control the operation of next detection station according to the testing result of last station, so can prevent to appear the condition of redetection to the defective products.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principle and embodiments of the present invention have been described herein by way of specific examples, which are provided only to help understand the method and the core idea of the present invention, and the above is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can also be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (8)

1. A lamp shell detection glue injection device for LED lamp strip assembly is characterized by comprising a conveying groove (11) with a cover plate on the upper portion, wherein a conveying device (12) is arranged at the bottom of the conveying groove (11), a contact plate position detection device (14), a size detection device (16) and a glue injection device (17) are sequentially arranged below the cover plate of the conveying groove (11) along the conveying direction, the distance between the contact plate position detection device and the size detection device is an integral multiple of the distance between adjacent lamp bead grooves (2) on a main body (1), intercepting devices (13) capable of penetrating into the conveying groove (11) and intercepting the main body (1) are uniformly arranged on a rear side plate of the conveying groove (11), the distances between the adjacent intercepting devices (13) and the adjacent lamp bead grooves (2) are consistent, the glue injection device (17) comprises a lifting cylinder (71) and a glue injection box (73) which are arranged below the cover plate of the conveying groove (11), the lamp bead groove structure is characterized in that a glue injection lifting seat (72) is connected to the lower portion of the glue injection lifting cylinder (71), a glue injection box (77) capable of being inserted into the lamp bead groove (2) is connected to the lower portion of the glue injection lifting seat (72), the glue injection box (77) is communicated with a glue injection box (73) through a glue injection hose, a glue injection pump (78) communicated with an inner cavity of the glue injection box (77) is embedded into a lower bottom plate of the glue injection box (77), a glue injection blocking plate (79) is arranged on the outer side of the glue injection box (77), the glue injection blocking plate (79) is a plate deformable under stress, the outer size of the glue injection blocking plate is larger than that of the lamp bead groove (2), and a glue injection limiting column (74) limiting the maximum descending position of the glue injection lifting seat (72) is arranged below the glue injection lifting seat.

2. The lamp housing detection glue injection device for LED lamp strip assembly according to claim 1, wherein a glue injection column (76) is arranged below the glue injection lifting seat (72), the glue injection column (76) is a hollow column, the lower end of the glue injection column is communicated with a glue injection box (77), the upper end of the glue injection column is communicated with a glue injection chute (75) in the glue injection lifting seat (72), the glue injection chute (75) is communicated with a glue injection box (73) through a glue injection hose, an electric heating block (80) is arranged in the glue injection box (77), a clamping pipe (81) is arranged on the outer side of the glue injection box (77), the outer side of the glue injection column (76) and the lower side of the glue injection lifting seat (72), and the clamping pipe (81) and the glue injection chute (75) are not on the same side.

3. The lamp shell detection glue injection device for LED lamp strip assembly according to claim 1, wherein the size detection device (16) comprises a size detection lifting cylinder (51) arranged below a cover plate of the conveying groove (11), a size detection box (52) is connected below the size detection lifting cylinder (51), a size detection induction screen (59) is embedded into the lower surface of the size detection box (52), the size detection induction screen (59) is of a square annular structure, the size of an inner ring is smaller than that of the lamp bead groove (2), the size of an outer ring is larger than that of the lamp bead groove (2), the size detection induction screen (59) can send formed induction signals to the picture analysis module in the form of pictures, and the picture analysis module analyzes whether the size of the lamp bead groove (2) is qualified or not.

4. The lamp housing detection glue injection device for LED lamp strip assembly according to claim 3, wherein a depth detection spring (53) with a vertical direction is arranged in the size detection box (52), a depth detection block (54) is arranged on the depth detection spring (53), a depth detection rod (55) capable of penetrating through the size detection box (52) is arranged below the depth detection block (54), a depth detection pressing cylinder (56) is arranged at the inner upper part of the size detection box (52), the depth detection pressing cylinder (56) is connected with a depth detection pressing block (57) capable of pressing down the depth detection block (54), and a distance measuring device (58) which is arranged at the inner upper part of the size detection box (52) in a vertical direction and matched with the depth detection block (54) is further arranged.

5. The lamp shell detection glue injection device for the LED lamp strip assembly according to claim 4, wherein a contact groove depth detection pin (60) capable of penetrating through the size detection box (52) and matching with the bottom of the contact groove (3) is further arranged in the size detection box (52), a magnetic grating read head (62) is arranged at the end, located in the size detection box (52), of the contact groove depth detection pin (60), and a magnetic grating ruler (61) which is vertically arranged and matches with the magnetic grating read head (62) is arranged on the inner wall of the size detection box (52).

6. The lamp shell detection glue injection device for the LED lamp strip assembly as claimed in claim 5, wherein the contact groove depth detection pins (60) are provided in two groups, are symmetrical about the center of the size detection box (52), and are matched with the magnetic grid reading head (62) and the magnetic grid ruler (61) for each contact groove depth detection pin (60).

7. The lamp shell detection glue injection device for LED lamp strip assembly according to claim 1, wherein the contact position detection device (14) comprises a position detection lifting cylinder (34) arranged below the cover plate of the conveying trough (11), the position detection lifting cylinder (34) is connected with a position detection lifting block (35), two position detection columns (37) respectively matched with the two contacts (4) on two sides of the lamp bead trough (2) in position are arranged below the position detection lifting block (35), a position detection sensor (38) is connected below the position detection columns (37), the position detection sensor (38) is a contact sensor, and the two position detection columns (37) are symmetrical about the axis of the position detection lifting cylinder (34).

8. The lamp casing detection glue injection device for LED lamp strip assembly according to claim 7, wherein the contact position detection device (14) further comprises a position detection motor (31) and a position detection screw rod (32) which are arranged below the cover plate of the conveying trough (11), the position detection screw rod (32) is matched with a position detection movable block (33), the position detection lifting cylinder (34) is arranged below the position detection movable block (33), and the position detection sensor (38) is a contact sensor capable of generating contact sensing signals for the lower bottom surface and the outer side surface respectively.

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