An automatic stretching machine

CN224761225UActive Publication Date: 2026-09-18ZHUHAI HORNG SHEN MASCH CO LTD
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Patent Information

Application Number
CN202522228592.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-22
Publication Date
2026-09-18
Estimated Expiration
2035-10-22

AI Technical Summary

Technical Problem

[0002]随着经济的发展以及世界的交融,越来越多的外国菜品搬上了国人的餐桌,寿司、天妇罗等菜品广受人们的喜爱,这些菜品中都需要用到虾,并且需要将虾展平后再使用;目前行业内的虾拉长作业多依赖两种方式:一是纯人工操作,工人手持工具对虾逐一挤压,不仅劳动强度大、效率极低,还难以保证每个虾的拉长力度和长度统一,产品标准化程度差;二是采用单工位半自动拉长设备,该设备一次仅能处理一组虾,完成一次拉长后需停机取出成品、重新放入待加工虾,存在大量停机等待时间,无法满足规模化生产中连续作业的需求,导致整体生产效率受限,难以匹配现代化虾产品加工生产线的节拍;因此,急需一种自动拉长机来解决上述问题

Benefits of technology

[0014] The beneficial effects of this utility model are as follows: An automatic stretching machine includes a frame, a feeding conveyor line, a first stretching device, a second stretching device, and a pushing device; the feeding conveyor line is used to convey the lower stretching die, which is provided with a plurality of stretching slots for carrying shrimp; the first stretching device is connected to one side of the end of the feeding conveyor line and a first stretching upper die is provided thereon; the second stretching device is connected to the other side of the end of the feeding conveyor line and a second stretching upper die is provided thereon; the pushing device is connected between the feeding conveyor line, the first stretching device, and the second stretching device, and is used to alternately push the lower stretching die on the feeding conveyor line to the first stretching slot; The system includes a first elongation device and a second elongation device, which alternately extrude and elongate the shrimp in the elongation slot using the first and second elongation upper dies. These devices form a complete automated operation chain. The feeding conveyor automatically transports the elongation lower die carrying shrimp, and the pushing device accurately distributes the lower die to the corresponding elongation device. This eliminates the need for frequent manual intervention in feeding, station switching, and other processes, significantly reducing downtime. Compared to single-station equipment, this system effectively increases the shrimp elongation processing capacity per unit time, adapts to the needs of large-scale production, reduces the difficulty and labor intensity of manual operation, minimizes the impact of human error on the production process, and improves overall operational stability.

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Abstract

This utility model discloses an automatic shrimp stretching machine, including a frame, a feeding conveyor line, a first stretching device, a second stretching device, and a pushing device. The feeding conveyor line is used to convey the lower stretching die. The first stretching device is connected to one side of the end of the feeding conveyor line and has a first stretching upper die on it. The second stretching device is connected to the other side of the end of the feeding conveyor line and has a second stretching upper die on it. The pushing device is connected between the feeding conveyor line, the first stretching device, and the second stretching device. The feeding conveyor line automatically conveys the lower stretching die carrying shrimp, and the pushing device accurately distributes the lower die to the corresponding stretching device. This eliminates the need for frequent manual intervention in feeding, station switching, and other processes, significantly reducing downtime and waiting time, effectively increasing the shrimp stretching processing capacity per unit time, adapting to the needs of large-scale production, reducing the difficulty and labor intensity of manual operation, reducing the impact of human error on the production process, and improving overall operational stability.
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Description

Technical Field

[0001] This utility model relates to the field of shrimp product production technology, and in particular to an automatic stretching machine. Background Technology

[0002] With economic development and global integration, more and more foreign dishes are appearing on Chinese tables. Dishes such as sushi and tempura are widely loved. These dishes all require shrimp, which need to be flattened before use. Currently, shrimp stretching operations in the industry rely on two main methods: one is purely manual operation, where workers use tools to squeeze shrimp one by one. This is not only labor-intensive and inefficient, but also makes it difficult to ensure uniform stretching force and length for each shrimp, resulting in poor product standardization. The other method uses single-station semi-automatic stretching equipment. This equipment can only process one group of shrimp at a time. After one stretching cycle, the machine needs to be stopped to remove the finished product and put in shrimp to be processed again, resulting in a large amount of downtime and waiting time. This cannot meet the needs of continuous operation in large-scale production, thus limiting overall production efficiency and making it difficult to match the pace of modern shrimp product processing production lines. Therefore, there is an urgent need for an automatic stretching machine to solve the above problems. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an automatic stretching machine.

[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: an automatic stretching machine, including a frame, a feeding conveyor line, a first stretching device, a second stretching device, and a pushing device; The feeding conveyor line is used to transport the elongated lower die, which is equipped with several elongated slots for carrying shrimp; The first elongation device is connected to one side of the end of the feeding conveyor line and is provided with a first elongation upper die; The second elongation device is connected to the other side of the end of the feeding conveyor line and is provided with a second elongation upper die. The pushing device is connected between the feeding conveyor line, the first stretching device and the second stretching device. It is used to alternately push the lower stretching die on the feeding conveyor line to the first stretching device and the second stretching device, so that the first stretching upper die and the second stretching upper die alternately squeeze and stretch the shrimp in the stretching groove.

[0005] As one of the preferred embodiments of this utility model, the first elongation device includes a first base, a first driving component, and a second driving component; The first base is provided with a first elongated space that extends laterally; The first drive component is disposed on the first base, and the first elongated upper die is disposed in the first elongation space and connected to the output end of the first drive component. The second drive assembly is disposed at the side end of the first elongation space and is used to push the lower elongation die on the pusher into the first elongation space and is located below the upper elongation die. The first drive component can drive the first elongation upper die to approach the elongation lower die in order to squeeze and elongate the shrimp inside the elongation lower die.

[0006] In one of the preferred embodiments of the present invention, the first drive component and / or the second drive component are configured as cylinders.

[0007] As one of the preferred embodiments of this utility model, the second elongation device includes a second base, a third drive assembly, and a fourth drive assembly; The second base is provided with a second elongated space that extends laterally; The third drive component is disposed on the second base, and the second elongated upper die is disposed in the second elongation space and connected to the output end of the third drive component. The fourth drive assembly is located at the side end of the second elongation space and is used to push the lower elongation die on the pusher into the second elongation space and is located below the upper elongation die. The third drive component can drive the second elongating upper die to approach the elongating lower die in order to squeeze and elongate the shrimp inside the elongating lower die.

[0008] In one of the preferred embodiments of this utility model, the third drive component and / or the fourth drive component are configured as cylinders.

[0009] As one of the preferred embodiments of this utility model, the pushing device includes a pusher plate and a fifth drive assembly; The push plate is provided with a first push groove and a second push groove. The first push groove is provided with a first inlet and a first outlet, and the second push groove is provided with a second inlet and a second outlet. The fifth drive assembly is mounted on the frame and connected to the push plate, and is used to drive the push plate back and forth between the feeding conveyor line, the first elongation device and the second elongation device. The elongating lower die on the feeding conveyor line can enter the first push groove through the first inlet and be conveyed to the first elongation device through the first outlet to squeeze and elongate the shrimp in the elongating lower die; or, the elongating lower die on the feeding conveyor line can enter the second push groove through the second inlet and be conveyed to the second elongation device through the second outlet to squeeze and elongate the shrimp in the elongating lower die.

[0010] As one of the preferred embodiments of this utility model, a limiting plate is provided on the frame. The limiting plate can be opposite to the first discharge port or the second discharge port to restrict the elongated lower die from disengaging from the first push groove or the second push groove.

[0011] As one of the preferred embodiments of this utility model, the limiting plate is provided with rollers, and the elongated lower mold can abut against the rollers when entering the first push groove or the second push groove.

[0012] As one of the preferred embodiments of this utility model, a detection device is provided on the frame. The detection device can be opposite to the first discharge port or the second discharge port to detect whether the elongated lower die has entered the first push groove or the second push groove.

[0013] As one of the preferred embodiments of this utility model, a return material conveying line is provided on the frame. The beginning of the return material conveying line is opposite to the first elongation device and the second elongation device, and the end of the return material conveying line is opposite to the beginning of the feeding conveying line, for returning empty elongated lower molds.

[0014] The beneficial effects of this utility model are as follows: An automatic stretching machine includes a frame, a feeding conveyor line, a first stretching device, a second stretching device, and a pushing device; the feeding conveyor line is used to convey the lower stretching die, which is provided with a plurality of stretching slots for carrying shrimp; the first stretching device is connected to one side of the end of the feeding conveyor line and a first stretching upper die is provided thereon; the second stretching device is connected to the other side of the end of the feeding conveyor line and a second stretching upper die is provided thereon; the pushing device is connected between the feeding conveyor line, the first stretching device, and the second stretching device, and is used to alternately push the lower stretching die on the feeding conveyor line to the first stretching slot; The system includes a first elongation device and a second elongation device, which alternately extrude and elongate the shrimp in the elongation slot using the first and second elongation upper dies. These devices form a complete automated operation chain. The feeding conveyor automatically transports the elongation lower die carrying shrimp, and the pushing device accurately distributes the lower die to the corresponding elongation device. This eliminates the need for frequent manual intervention in feeding, station switching, and other processes, significantly reducing downtime. Compared to single-station equipment, this system effectively increases the shrimp elongation processing capacity per unit time, adapts to the needs of large-scale production, reduces the difficulty and labor intensity of manual operation, minimizes the impact of human error on the production process, and improves overall operational stability. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of an automatic stretching machine; Figure 2 This is a cross-sectional view of an automatic stretching machine; Figure 3 for Figure 2 A magnified view of a portion of region A in the middle; Figure 4 for Figure 2 A magnified view of a portion of region B in the middle. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Reference Figures 1-4 An automatic stretching machine includes a frame 100, a feeding conveyor line 200, a first stretching device 300, a second stretching device 400, and a pushing device 500. The feeding conveyor line 200 is used to convey the elongated lower die 610, which is provided with several elongated slots 611 for carrying shrimp. The first elongation device 300 is connected to one side of the end of the feeding conveyor line 200 and is provided with a first elongation upper die 620. The second elongation device 400 is connected to the other side of the end of the feeding conveyor line 200 and is provided with a second elongation upper die 630. The feeding device 500 is connected between the feeding conveyor line 200, the first elongation device 300 and the second elongation device 400, and is used to alternately push the lower elongation die 610 on the feeding conveyor line 200 to the first elongation device 300 and the second elongation device 400, so that the first elongation upper die 620 and the second elongation upper die 630 alternately squeeze and elongate the shrimp in the elongation groove 611.

[0021] In this utility model, the working process of the automatic stretching machine is as follows: ①Reference Figures 1-2 The feeding conveyor line 200 is arranged along the X-axis. The first elongation device 300 and the second elongation device 400 are located at the end of the feeding conveyor line 200 and arranged along the Y-axis, that is, the first elongation device 300 and the second elongation device 400 are arranged on both sides of the X-axis. The pushing device 500 is connected between the feeding conveyor line 200, the first elongation device 300 and the second elongation device 400. The worker places the elongated lower mold 610 containing shrimp one by one at the beginning of the feeding conveyor line 200, which is driven by the feeding conveyor line 200 towards... In the forward conveying process, when the first elongated lower die 610 enters the pusher device 500, it will be pushed by the pusher device 500 to the first elongation device 300. At the same time, the second elongated lower die 610 also enters the pusher device 500, at which point the pusher device 500 pushes the second elongated lower die 610 to the second elongation device 400. At the same time, the third elongated lower die 610 also enters the pusher device 500, and the pusher device 500 pushes the third elongated lower die 610 to the first elongation device 300... and so on.

[0022] Furthermore, after the lower stretching die 610 enters the first stretching device 300, the first stretching device 300 drives the upper stretching die 620 to approach the lower stretching die 610, thereby squeezing the shrimp in the lower stretching die 610, causing the shrimp in the stretching groove 611 to be squeezed and lengthened; further still, after the stretching is completed, the worker removes the lower stretching die 610 from the other end of the first stretching device 300, and removes the shrimp from the lower stretching die 610.

[0023] Preferably, a return material conveyor line 900 is provided on the frame 100. The beginning of the return material conveyor line 900 is opposite to the first elongation device 300 and the second elongation device 400, and the end of the return material conveyor line 900 is opposite to the beginning of the feeding conveyor line 200. It is used to return empty elongated lower dies 610. Specifically, the return material conveyor line 900 is configured as two sets, one set is connected between the first elongation device 300 and the beginning of the feeding conveyor line 200, and the other set is connected between the second elongation device 400 and the beginning of the feeding conveyor line 200. It can respectively return the elongated lower dies 610 processed and used by the first elongation device 300 and the second elongation device 400 to the beginning of the feeding conveyor line 200 for recycling.

[0024] ②Reference Figures 1-4 In some embodiments, the first elongation device 300 includes a first base 310, a first drive assembly 320, and a second drive assembly 330; the first base 310 is provided with a laterally penetrating first elongation space 340; the first drive assembly 320 is disposed on the first base 310, and the first elongation upper die 620 is disposed within the first elongation space 340 and connected to the output end of the first drive assembly 320; the second drive assembly 330 is disposed at the side end of the first elongation space 340 and is used to push the elongation lower die 610 on the pushing device 500 into the first elongation space 340 and is located below the first elongation upper die 620; the first drive assembly 320 can drive the first elongation upper die 620 to approach the elongation lower die 610 to squeeze and elongate the shrimp in the elongation lower die 610.

[0025] Preferably, the second elongation device 400 includes a second base 410, a third drive assembly 420, and a fourth drive assembly 430; the second base 410 is provided with a laterally penetrating second elongation space 440; the third drive assembly 420 is disposed on the second base 410, and the second elongation upper die 630 is disposed within the second elongation space 440 and connected to the output end of the third drive assembly 420; the fourth drive assembly 430 is disposed at the side end of the second elongation space 440 and is used to push the elongation lower die 610 on the pushing device 500 into the second elongation space 440 and is located below the second elongation upper die 630; the third drive assembly 420 can drive the second elongation upper die 630 to approach the elongation lower die 610 to squeeze and elongate the shrimp in the elongation lower die 610.

[0026] Taking the first elongation device 300 as an example, specifically, the first drive assembly 320 first drives the first elongation upper die 620 to move upward along the Z-axis. When the pusher device 500 pushes the elongation lower die 610 to be opposite the side end of the first elongation space 340, the second drive assembly 330 pushes the elongation lower die 610 into the first elongation space 340. Then, the first limiting assembly 910 pushes the side end of the elongation lower die 610, so that the elongation lower die 610 is fixed in the first elongation space 340. Then, the first drive assembly 320 is activated to drive the first elongation upper die 620 along the Z-axis. The lower movement (approaching the lower elongation die 610) preferably has multiple pressure blocks on the first elongation upper die 620 corresponding to the elongation slots 611. When the pressure blocks extend into the elongation slots 611, they will squeeze the shrimp in the elongation slots 611, causing them to flatten and elongate. After elongation, the worker removes the lower elongation die 610 from the first elongation space 340 in the positive direction of the X-axis (the end facing away from the second drive assembly 330), and removes the elongated shrimp from the lower elongation die 610. Finally, the empty lower elongation die 610 is returned to the beginning of the feeding conveyor line 200 via the return conveyor line 900.

[0027] Reference Figures 1-4 In some embodiments, the first drive component 320, the second drive component 330, the third drive component 420 and / or the fourth drive component 430 are configured as cylinders. In the second elongation device 400, after the elongation lower die 610 enters the second elongation space 440, the second limiting component 920 pushes the side end of the elongation lower die 610, so that the elongation lower die 610 is fixed in the second elongation space 440.

[0028] ③Reference Figures 1-4 In some embodiments, the feeding device 500 includes a pusher plate 510 and a fifth drive assembly 520; the pusher plate 510 is provided with a first push groove 530 and a second push groove 540, the first push groove 530 is provided with a first inlet 531 and a first outlet 532, and the second push groove 540 is provided with a second inlet 541 and a second outlet 542; the fifth drive assembly 520 is mounted on the frame 100 and connected to the pusher plate 510, and is used to drive the pusher plate 510 back and forth between the feeding conveyor line 200 and the first elongation device. Between the first elongation device 300 and the second elongation device 400; the elongation lower die 610 on the feeding conveyor line 200 can enter the first push groove 530 through the first inlet 531 and be conveyed to the first elongation device 300 through the first outlet 532 to squeeze and elongate the shrimp in the elongation lower die 610, or the elongation lower die 610 on the feeding conveyor line 200 can enter the second push groove 540 through the second inlet 541 and be conveyed to the second elongation device 400 through the second outlet 542 to squeeze and elongate the shrimp in the elongation lower die 610.

[0029] Specifically, the fifth drive assembly 520 first drives the push plate 510 to move to the first inlet 531, which is opposite to the end of the feeding conveyor line 200. After the first elongated lower die 610 enters the first push groove 530 through the first inlet 531, the fifth drive assembly 520 drives the push plate 510 to move to the second inlet 541, which is opposite to the end of the feeding conveyor line 200. At this time, the first outlet 532 is opposite to the first elongation space 340 of the first elongation device 300. The second drive assembly 330 pushes the elongated lower die 610 in the first push groove 530 into the first elongation space 340 for the elongation process. Meanwhile, the second elongated lower die 610 enters the second push groove 540 through the second inlet 541; then the fifth drive assembly 520 drives the push plate 510 to move again to the first inlet 531 opposite to the end of the feeding conveyor line 200. At this time, the second outlet 542 is opposite to the second elongation space 440 of the second elongation device 400. The fourth drive assembly 430 pushes the elongated lower die 610 in the second push groove 540 into the second elongation space 440 for the elongation process. At the same time, the third elongated lower die 610 enters the first push groove 530 through the first inlet 531... and so on.

[0030] ④Reference Figures 1-4 In some embodiments, a limiting plate 700 is provided on the frame 100. The limiting plate 700 can be opposite to the first discharge port 532 or the second discharge port 542 to restrict the elongated lower die 610 from disengaging from the first push groove 530 or the second push groove 540. Specifically, the limiting plate 700 is located on the side of the push plate 510 facing away from the feeding conveyor line 200 and extends above the push plate 510, that is, the push plate 510 reciprocates below the limiting plate 700. Furthermore, rollers are provided on the limiting plate 700. 710, the elongated lower die 610 can abut against the roller 710 when entering the first push groove 530 or the second push groove 540. This arrangement allows the elongated lower die 610 in the first push groove 530 or the second push groove 540 to abut against the roller 710 when the fifth drive assembly 520 drives the push plate 510 back and forth between the first elongation device 300 and the second elongation device 400. This not only restricts the elongated lower die 610 from disengaging from the first push groove 530 or the second push groove 540, but also reduces the friction between the two.

[0031] ⑤Reference Figures 1-4 In some embodiments, a detection device 800 is provided on the frame 100. The detection device 800 can be opposite to the first discharge port 532 or the second discharge port 542 to detect whether the elongated lower die 610 has entered the first push groove 530 or the second push groove 540. Alternatively, the detection device 800 can be configured as a micro switch. The fifth drive component 520 is activated to drive the push plate 510 to move only when the elongated lower die 610 is fully entered into the first push groove 530 or the second push groove 540 and the micro switch is triggered, thus avoiding the situation where the elongated lower die 610 gets stuck.

[0032] The advantages of this invention are as follows: each device forms a complete automated operation chain. The feeding conveyor automatically transports the elongated lower mold carrying shrimp, and the pushing device accurately distributes the lower mold to the corresponding elongation device. There is no need for frequent manual intervention in feeding, workstation switching, etc., which greatly reduces downtime. Compared with single-workstation equipment, it effectively increases the shrimp elongation processing capacity per unit time, adapts to the needs of large-scale production, reduces the difficulty and labor intensity of manual operation, and at the same time reduces the impact of human error on the production process, thus improving the overall operational stability.

[0033] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An automatic stretching machine, characterized in that: It includes a frame (100), a feeding conveyor line (200), a first elongation device (300), a second elongation device (400), and a pushing device (500); The feeding conveyor line (200) is used to convey the elongated lower die (610), and the elongated lower die (610) is provided with a plurality of elongated slots (611) for carrying shrimp. The first elongation device (300) is connected to one side of the end of the feeding conveyor line (200) and is provided with a first elongation upper die (620). The second elongation device (400) is connected to the other side of the end of the feeding conveyor line (200) and a second elongation upper die (630) is provided thereon. The pushing device (500) is connected between the feeding conveyor line (200), the first stretching device (300) and the second stretching device (400), and is used to alternately push the stretching lower die (610) on the feeding conveyor line (200) to the first stretching device (300) and the second stretching device (400), so that the first stretching upper die (620) and the second stretching upper die (630) alternately squeeze and stretch the shrimp in the stretching groove (611).

2. The automatic stretching machine according to claim 1, characterized in that: The first elongation device (300) includes a first base (310), a first drive assembly (320), and a second drive assembly (330); The first base (310) is provided with a first elongated space (340) that extends laterally. The first drive component (320) is disposed on the first base (310), and the first elongated upper mold (620) is disposed in the first elongation space (340) and connected to the output end of the first drive component (320); The second drive assembly (330) is disposed at the side end of the first elongation space (340) for pushing the elongation lower die (610) on the pusher device (500) into the first elongation space (340) and located below the first elongation upper die (620); The first drive assembly (320) can drive the first elongated upper die (620) to approach the elongated lower die (610) to extrude and elongate the shrimp inside the elongated lower die (610).

3. An automatic stretching machine according to claim 2, characterized in that: The first drive assembly (320) and / or the second drive assembly (330) are configured as cylinders.

4. An automatic stretching machine according to claim 1, characterized in that: The second elongation device (400) includes a second base (410), a third drive assembly (420) and a fourth drive assembly (430). The second base (410) is provided with a second elongated space (440) that extends laterally. The third drive component (420) is disposed on the second base (410), and the second elongated upper die (630) is disposed in the second elongation space (440) and connected to the output end of the third drive component (420); The fourth drive assembly (430) is disposed at the side end of the second elongation space (440) and is used to push the elongation lower die (610) on the pusher device (500) into the second elongation space (440) and is located below the second elongation upper die (630); The third drive assembly (420) can drive the second elongating upper die (630) to approach the elongating lower die (610) to squeeze and elongate the shrimp inside the elongating lower die (610).

5. An automatic stretching machine according to claim 4, characterized in that: The third drive assembly (420) and / or the fourth drive assembly (430) are configured as cylinders.

6. An automatic stretching machine according to claim 1, characterized in that: The feeding device (500) includes a pusher plate (510) and a fifth drive assembly (520). The push plate (510) is provided with a first push groove (530) and a second push groove (540). The first push groove (530) is provided with a first inlet (531) and a first outlet (532). The second push groove (540) is provided with a second inlet (541) and a second outlet (542). The fifth drive assembly (520) is mounted on the frame (100) and connected to the push plate (510), and is used to drive the push plate (510) to move back and forth between the feeding conveyor line (200), the first elongation device (300) and the second elongation device (400); The elongating lower die (610) on the feeding conveyor line (200) can enter the first push groove (530) through the first inlet (531) and be conveyed to the first elongating device (300) through the first outlet (532) to squeeze and elongate the shrimp in the elongating lower die (610). Alternatively, the elongating lower die (610) on the feeding conveyor line (200) can enter the second push groove (540) through the second inlet (541) and be conveyed to the second elongating device (400) through the second outlet (542) to squeeze and elongate the shrimp in the elongating lower die (610).

7. An automatic stretching machine according to claim 6, characterized in that: A limiting plate (700) is provided on the frame (100). The limiting plate (700) can be opposite to the first discharge port (532) or the second discharge port (542) to restrict the elongated lower die (610) from disengaging from the first push groove (530) or the second push groove (540).

8. An automatic stretching machine according to claim 7, characterized in that: The limiting plate (700) is provided with rollers (710), and the elongated lower die (610) can abut against the rollers (710) when entering the first push groove (530) or the second push groove (540).

9. An automatic stretching machine according to claim 6, characterized in that: The frame (100) is provided with a detection device (800), which can be opposite to the first discharge port (532) or the second discharge port (542) to detect whether the elongated lower die (610) enters the first push groove (530) or the second push groove (540).

10. An automatic stretching machine according to claim 1, characterized in that: The frame (100) is provided with a return material conveyor line (900), the beginning of which is opposite to the first elongation device (300) and the second elongation device (400), and the end of which is opposite to the beginning of the feeding conveyor line (200), for returning the empty elongation lower die (610).