A folding spoon jig

By designing a folding spoon fixture with a clamping mechanism and a buffer module, the problems of high cost and poor adaptability of existing fixtures have been solved, achieving efficient and precise spoon folding and product protection.

CN224277879UActive Publication Date: 2026-05-26ZHUHAI DINGJU INTELLIGENT EQUIPMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHUHAI DINGJU INTELLIGENT EQUIPMENT CO LTD
Filing Date
2025-05-30
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing spoon folding jigs are costly, have poor adaptability, are prone to damaging the spoon during clamping, and lack a cushioning structure or have poor cushioning effect.

Method used

A spoon-folding fixture was designed, comprising a clamping mechanism, a fixture fixing plate, cylinders, and a thrust block. The thrust block is driven to move synchronously by multiple cylinders of the clamping mechanism, and the buffer module is used to achieve efficient and precise spoon bending. The clamping components can be slidably adjusted to adapt to different spacings, and the buffer module absorbs the impact force.

Benefits of technology

It achieves efficient and precise spoon folding, reduces production costs, improves production efficiency and product consistency, and protects the integrity of the spoon.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the field of jig technology, specifically to a folding spoon jig, including a spoon and a clamping mechanism for holding the spoon. A jig fixing plate is movably arranged at the bottom of the clamping mechanism, and several cylinders a are fixed on the jig fixing plate. The output end of the cylinders a is equipped with a thrust block for cooperating with the clamping mechanism to bend the spoon. The clamping mechanism includes a jig base plate, a sliding frame, a clamping component, a lifting frame, and a cylinder b. This folding spoon jig achieves flexible adaptation of clamping spacing and quantity through the freely adjustable clamping component on the sliding frame. At the same time, the buffer module absorbs the impact force through the elastic deformation of the buffer spring, and the buffer spring compression stroke is adjusted by the internal hex nut to customize the buffering performance. Finally, under the synergistic action of the lifting frame driven by cylinder b and the thrust block linked by cylinder a, a highly flexible, impact-resistant, and customizable spoon folding effect is achieved.
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Description

Technical Field

[0001] This utility model relates to the field of jig technology, specifically a folding spoon jig. Background Technology

[0002] In the initial stage of instant noodle spoon production, the spoon handle and spoon body are folded at a 90-degree angle. Before being placed into the instant noodle box, it needs to be folded along a preset fold line to become a contracted shape. Traditional manual folding has problems such as low efficiency, high cost, poor consistency and hygiene risks. To address this, a spoon folding fixture has been introduced. It can automatically, accurately and efficiently complete the standard folding action of the spoon, replacing manual operation. This significantly improves the folding speed and product consistency, reduces labor costs, reduces human contact, thereby improving production efficiency and hygiene standards, and optimizing the overall packaging process.

[0003] Folding spoon fixtures are designed specifically for producing folding spoons for instant noodles in buckets, replacing manual folding of the spoons. However, they still have certain problems: 1) They mostly use gripper cylinders to correspond one-to-one with the spoon positions, which requires high manufacturing costs, and the gripper positions cannot be adjusted according to the position and number of spoons in the mold, resulting in poor adaptability; 2) There is no buffer structure or the buffering effect is poor during the clamping process, which can easily damage the spoons. Therefore, in view of the above situation, there is an urgent need to develop a folding spoon fixture to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this utility model is to provide a folding spoon fixture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a spoon-folding fixture, including a spoon and a clamping mechanism for holding the spoon. A fixture fixing plate is movably provided at the bottom of the clamping mechanism. Several cylinders a are fixed on the fixture fixing plate. A push block for cooperating with the clamping mechanism to bend the spoon is installed at the output end of the cylinders a.

[0006] In practical use, the clamping mechanism firmly holds the spoon, and the push blocks driven by multiple cylinders on the fixture plate move synchronously, which can efficiently and accurately complete the bending operation of a batch of spoons, significantly improving production efficiency. Because the clamping mechanism fixes the spoon body, the force applied by the push blocks is stable and controllable, which can ensure the molding quality. The structure is compact and the operation is reliable.

[0007] The clamping mechanism includes a fixture base plate, a sliding shaft frame, clamping components, a lifting frame, and a cylinder b. Two sliding shaft frames are installed opposite each other on the bottom edge of the fixture base plate. Several clamping components are divided into two groups and can be slidably installed on the two sliding shaft frames. The cylinder b is installed vertically on the fixture base plate, and the lifting frame is installed horizontally on the output end of the cylinder b. The clamping components are driven to connect with the lifting frame.

[0008] In practical use, multiple clamping components are opened and closed precisely and synchronously. Two sets of clamping components are guided and slid through a sliding frame to achieve precise position adjustment, which can adapt to clamping requirements of different spacing. They are driven by cylinder b through a lifting frame to ensure consistency of clamping / releasing actions on the spoon. The space layout and structural rigidity are optimized for easy maintenance and adjustment. The modular clamping components are arranged along the sliding frame, making it easy to disassemble, replace or adjust the spacing to adapt to spoons of different sizes.

[0009] The clamping assembly includes a housing, a main shaft, a slide rail, a drive crankshaft, a buffer module, a gripper seat, and grippers. The main shaft is slidably inserted into the housing. The slide rail is horizontally and detachably mounted at the bottom of the housing. The buffer module is rotatably mounted in the slide rail. The two gripper seats are slidably mounted in the slide rail. The drive crankshaft is located inside the housing. The bottom end of the main shaft is connected to the gripper seats via the drive crankshaft. The grippers are detachably mounted on the gripper seats.

[0010] In practical use, the clamping assembly achieves precise and reliable clamping force transmission. The main shaft converts vertical motion into horizontal opening and closing of the gripper seats through the transmission crankshaft, ensuring symmetrical and synchronous movement of the grippers. The buffer module effectively absorbs impacts, preventing the spoon from being damaged by rigid clamping, and improving the stability of the clamping process and product protection.

[0011] Preferably, the fixture fixing plate has several guide grooves.

[0012] In practical use, if the handle of the spoon is relatively long, when it is bent in conjunction with the push block, the handle can be inserted into the guide groove, thereby offsetting it from the fixture fixing plate, so as to adapt to the bending operation of spoons with different handle lengths.

[0013] Preferably, a sliding sleeve is fixed on the outer side of the housing, the sliding sleeve is fitted on the sliding shaft frame and is slidably connected to the sliding shaft frame, and a top cover is installed on the top of the housing.

[0014] In actual use, ensure that the clamping component slides smoothly and accurately along the slide frame. The slide sleeve is equipped with fastening bolts for locking the position, which makes it easy to lock the clamping component after adjusting its position.

[0015] Preferably, a bushing is fixed at the top end of the main shaft, the bushing is fitted on the lifting frame and is slidably connected to the lifting frame, and a groove a is welded to the bottom end of the main shaft, and one end of the transmission crankshaft is slidably connected to the groove a.

[0016] In practical use, when the lifting frame is raised and lowered, it works in conjunction with the bushing to drive the main shaft to rise and fall synchronously, which in turn drives the transmission crankshaft to rotate through the slide groove a.

[0017] Preferably, side sealing plates are installed at both ends of the slide rail.

[0018] Preferably, the buffer module includes a bidirectional lead screw, a buffer spring, an adjusting member, and a sliding shaft. The bidirectional lead screw is rotatably mounted on the side sealing plate. A through groove is provided in the middle of the slide rail, and the sliding shaft passes through the through groove. Two adjusting members are sleeved on the bidirectional lead screw and the sliding shaft. The adjusting members are slidably connected to the sliding shaft and threadedly connected to the bidirectional lead screw. Two buffer springs are sleeved on the bidirectional lead screw, and an internal hexagonal nut is installed at one end of the bidirectional lead screw.

[0019] In practical use, the compression stroke between the buffer spring and the gripper seat is adjusted by the threaded engagement of the double-acting screw and the adjusting component, thereby controlling the buffering effect. The buffer spring effectively absorbs the clamping impact to protect the spoon, and the sliding constraint between the sliding shaft and the through groove ensures that the adjusting component moves without deflection. An Allen wrench can be used to turn the Allen nut and drive the double-acting screw to rotate, thereby fine-tuning the compression stroke of the buffer spring. The overall structure integrates rigid transmission and flexible buffering functions within a limited space. It should be noted that the sliding shaft and the gripper seat do not contact each other. The gripper seat has a through groove, and the double-acting screw passes through the through groove without contacting it. One end of the buffer spring is embedded in the through groove and in contact with it, while the other end of the buffer spring is in contact with the adjusting component.

[0020] Preferably, a groove b is installed at the top of the gripper seat, and one end of the drive crankshaft is slidably connected to the groove b.

[0021] In practical use, when the transmission crankshaft is driven by the main shaft in conjunction with the slide groove a, it can also be driven by the slide groove b to drive the gripper seat to move horizontally relative to the slide rail.

[0022] Compared with the prior art, the present invention provides a folding spoon fixture, which has the following beneficial effects:

[0023] This type of spoon folding fixture achieves flexible adaptation of clamping spacing and quantity through a freely sliding and adjustable clamping component on the sliding shaft frame. At the same time, the buffer module absorbs impact force through the elastic deformation of the buffer spring, and the buffer spring compression stroke is adjusted by the internal hex nut to customize the buffering performance. Finally, under the synergistic action of the lifting frame driven by cylinder b and the linkage thrust block of cylinder a, a highly flexible, impact-resistant, and customizable spoon folding efficiency is achieved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0026] Figure 2 This is a side view of the present invention.

[0027] Figure 3 This is an overall exploded view of the present invention;

[0028] Figure 4 This is a diagram of the clamping mechanism of this utility model;

[0029] Figure 5 This is a schematic diagram of the clamping component structure of this utility model;

[0030] Figure 6 This is an exploded view of the clamping assembly of this utility model;

[0031] Figure 7 This is a side view of the internal structure of the clamping assembly of this utility model;

[0032] Figure 8 This is a schematic diagram showing the positional relationship between the buffer module and the gripper seat of this utility model;

[0033] Figure 9 This is a schematic diagram of the buffer module structure of this utility model;

[0034] Figure 10 This is a schematic diagram of the gripper seat structure of this utility model;

[0035] Figure 11 This is a schematic diagram showing the positional relationship between the slide groove a and the transmission crankshaft of this utility model;

[0036] Figure 12 This is a schematic diagram of the transmission crankshaft structure of this utility model.

[0037] In the diagram: 10. Fixture fixing plate; 110. Guide groove; 120. Cylinder a; 130. Thrust block; 20. Spoon; 30. Clamping mechanism; 310. Fixture base plate; 320. Sliding shaft frame; 330. Clamping assembly; 331. Housing; 3311. Sliding sleeve; 3312. Top cover; 332. Main shaft; 3321. Bushing; 3322. Sliding groove a; 333. Sliding rail; 3331. Side sealing plate; 334. Drive crankshaft; 335. Buffer module; 3351. Two-way lead screw; 3352. Buffer spring; 3353. Adjustable distance component; 3354. Sliding shaft; 3355. Socket hex nut; 336. Claw seat; 3361. Sliding groove b; 337. Claw; 340. Lifting frame; 350. Cylinder b. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Example:

[0041] Please see Figures 1-12 This utility model provides a technical solution: a spoon folding fixture, including a spoon 20 and a clamping mechanism 30 for clamping the spoon 20. A fixture fixing plate 10 is movably provided at the bottom of the clamping mechanism 30. A plurality of cylinders a120 are fixed on the fixture fixing plate 10. A push block 130 is installed at the output end of the cylinders a120 for cooperating with the clamping mechanism 30 to bend the spoon 20.

[0042] In practical use, the clamping mechanism 30 firmly holds the spoon 20, and the push block 130 driven by multiple cylinders a120 on the fixture fixing plate 10 moves synchronously, which can efficiently and accurately complete the bending operation of a batch of spoons 20, significantly improving production efficiency. Because the clamping mechanism 30 fixes the spoon body, the force applied by the push block 130 is stable and controllable, which can ensure the molding quality. The structure is compact and the operation is reliable.

[0043] The clamping mechanism 30 includes a fixture base plate 310, a sliding shaft frame 320, a clamping assembly 330, a lifting frame 340, and a cylinder b350. Two sliding shaft frames 320 are mounted opposite each other on the bottom edge of the fixture base plate 310. Several clamping assemblies 330 are divided into two groups and slidably mounted on the two sliding shaft frames 320. The cylinder b350 is vertically mounted on the fixture base plate 310. The lifting frame 340 is horizontally mounted on the output end of the cylinder b350. The clamping assembly 330 is drivenly connected to the lifting frame 340.

[0044] In practical use, multiple clamping components 330 can be opened and closed precisely and synchronously. Two sets of clamping components 330 are guided and slid through the sliding frame 320 to achieve precise position adjustment, which can adapt to clamping requirements of different spacing. They are driven by the cylinder b350 through the lifting frame 340 to ensure the consistency of clamping / releasing actions on the spoon 20. The space layout and structural rigidity are optimized, which is convenient for maintenance and adjustment. The modular clamping components 330 are arranged along the sliding frame 320, which is easy to disassemble, replace or adjust the spacing to adapt to spoons 20 of different sizes.

[0045] The clamping assembly 330 includes a housing 331, a main shaft 332, a slide rail 333, a transmission crankshaft 334, a buffer module 335, a gripper seat 336, and grippers 337. The main shaft 332 is slidably inserted into the housing 331. The slide rail 333 is horizontally and detachably installed at the bottom of the housing 331. The buffer module 335 is rotatably installed in the slide rail 333. The two gripper seats 336 are slidably installed in the slide rail 333. The transmission crankshaft 334 is located in the housing 331. The bottom of the main shaft 332 is connected to the gripper seats 336 through the transmission crankshaft 334. The grippers 337 are detachably installed on the gripper seats 336.

[0046] In practical use, the clamping assembly 330 achieves precise and reliable clamping force transmission. The main shaft 332 converts vertical motion into horizontal opening and closing of the gripper seat 336 through the transmission crankshaft 334, ensuring symmetrical and synchronous movement of the gripper 337. The buffer module 335 effectively absorbs impact, preventing the spoon 20 from being damaged by rigid clamping, and improving the stability of the clamping process and the protection of the product.

[0047] Preferably, the fixture fixing plate 10 has a plurality of guide grooves 110.

[0048] In practical use, if the handle of the spoon 20 is relatively long, when it is bent in conjunction with the push block 130, the handle can be inserted into the guide groove 110, thereby offsetting it from the fixture fixing plate 10, so as to adapt to the bending operation of spoons 20 with different handle lengths.

[0049] Preferably, a sliding sleeve 3311 is fixedly provided on the outer side of the housing 331. The sliding sleeve 3311 is sleeved on the sliding shaft frame 320 and slidably connected to the sliding shaft frame 320. A top cover 3312 is installed on the top of the housing 331.

[0050] In actual use, ensure that the clamping component 330 slides smoothly and accurately along the slide frame 320. The slide sleeve 3311 is provided with a fastening bolt for locking the position, which makes it easy to lock the clamping component 330 after adjusting its position.

[0051] Preferably, a bushing 3321 is fixedly provided at the top end of the main shaft 332, the bushing 3321 is sleeved on the lifting frame 340 and is slidably connected to the lifting frame 340, and a sliding groove a3322 is welded to the bottom end of the main shaft 332, and one end of the transmission crankshaft 334 is slidably connected to the sliding groove a3322.

[0052] In practical use, when the lifting frame 340 is raised and lowered, it works in conjunction with the bushing 3321 to drive the main shaft 332 to rise and fall synchronously, and then drives the transmission crankshaft 334 to rotate through the slide groove a3322.

[0053] Preferably, side sealing plates 3331 are installed at both ends of the slide rail 333.

[0054] Preferably, the buffer module 335 includes a bidirectional lead screw 3351, a buffer spring 3352, an adjusting member 3353, and a sliding shaft 3354. The bidirectional lead screw 3351 is rotatably mounted on the side sealing plate 3331. A through groove is provided in the middle of the slide rail 333, and the sliding shaft 3354 passes through the through groove. Two adjusting members 3353 are sleeved on the bidirectional lead screw 3351 and the sliding shaft 3354. The adjusting members 3353 are slidably connected to the sliding shaft 3354, and the adjusting members 3353 are threadedly connected to the bidirectional lead screw 3351. Two buffer springs 3352 are sleeved on the bidirectional lead screw 3351, and an internal hexagon nut 3355 is installed at one end of the bidirectional lead screw 3351.

[0055] In practical use, the compression stroke between the buffer spring 3352 and the gripper seat 336 is adjusted by the threaded engagement of the bidirectional lead screw 3351 and the adjusting component 3353, thereby controlling the buffering effect. The buffer spring 3352 effectively absorbs the clamping impact to protect the spoon 20. The sliding constraint between the sliding shaft 3354 and the through groove ensures that the adjusting component 3353 moves without deflection. An internal hex wrench can be used to rotate the internal hex nut 3355 and drive the bidirectional lead screw 3351 to rotate, thereby fine-tuning the compression stroke of the buffer spring 3352. The overall structure integrates rigid transmission and flexible buffering functions in a limited space. It should be noted that the sliding shaft 3354 does not contact the gripper seat 336. The gripper seat 336 has a through groove. The bidirectional lead screw 3351 passes through the through groove without contacting it. One end of the buffer spring 3352 is embedded in the through groove and in contact with it. The other end of the buffer spring 3352 is in contact with the adjusting component 3353.

[0056] Preferably, a groove b3361 is installed at the top of the gripper seat 336, and one end of the transmission crankshaft 334 is slidably connected to the groove b3361.

[0057] In practical use, when the transmission crankshaft 334 is driven by the main shaft 332 in conjunction with the slide groove a3322, it can also work with the slide groove b3361 to drive the gripper seat 336 to move horizontally relative to the slide rail 333.

[0058] Working principle: The output end of the robotic arm (or other driving device) is connected to the middle hole of the fixture base plate 310 of the clamping mechanism 30, driving the clamping mechanism 30 to move closer to the spoon 20 with several clamping components 330. Then, the cylinder b350 drives the lifting frame 340 to rise, which in turn drives the clamping components 330 to rotate. The grippers 337 of the clamping components 330 clamp the spoon 20, and then move the spoon 20 to the fixture fixing plate 10. The cylinder a120 drives the push block 130 to move towards the middle position. During its movement, it contacts the spoon handle of the spoon 20, which is bent at 90 degrees, and finally forces it to bend, thus achieving the bending process of the spoon 20. It should be noted here that the lifting... The frame 340, in conjunction with the bushing 3321, drives the main shaft 332 to rise. Then, through the slide groove a3322, it drives the transmission crankshaft 334 to rotate at a certain angle. This, in conjunction with the slide groove b3361, drives the gripper seat 336 to slide axially along the slide rail 333 toward the center position. Finally, it drives the gripper 337 to move. When the gripper seat 336 moves toward the center position, it will compress the buffer spring 3352, which will have a buffering effect. When it is necessary to adjust the buffering effect, the internal hex nut 3355 can be used to drive the double-acting screw 3351 to rotate. This, in turn, drives the adjusting piece 3353 to move axially relative to the slide shaft 3354, thereby adjusting the compression stroke of the buffer spring 3352 and ultimately adjusting its buffering performance.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A folding-spoon jig, characterized by: The utility model provides a utensil bending device, including a spoon (20), a clamping mechanism (30) for clamping the spoon (20), the bottom of the clamping mechanism (30) is movably provided with a jig fixing plate (10), a plurality of air cylinders a (120) are fixed on the jig fixing plate (10), and a push block (130) for cooperating with the clamping mechanism (30) to bend the spoon (20) is installed on the output end of the air cylinder a (120). The clamping mechanism (30) comprises a jig bottom plate (310), a slide shaft support (320), a clamping assembly (330), a jacking frame (340) and an air cylinder b (350), two slide shaft supports (320) are oppositely installed on the bottom edge of the jig bottom plate (310), a plurality of clamping assemblies (330) are slidably installed on the two slide shaft supports (320), the air cylinder b (350) is vertically installed on the jig bottom plate (310), the jacking frame (340) is horizontally installed on the output end of the air cylinder b (350), and the clamping assembly (330) is drivingly connected with the jacking frame (340). The clamping assembly (330) comprises a shell (331), a main shaft (332), a slide rail (333), a transmission crank (334), a buffer module (335), a clamping jaw base (336) and a clamping jaw (337), the main shaft (332) is slidably arranged in the shell (331), the slide rail (333) is horizontally detachably installed at the bottom end of the shell (331), the buffer module (335) is rotatably installed in the slide rail (333), two clamping jaw bases (336) are slidably installed in the slide rail (333), the transmission crank (334) is located in the shell (331), the bottom end of the main shaft (332) is drivingly connected with the clamping jaw base (336) through the transmission crank (334), and the clamping jaw (337) is detachably installed on the clamping jaw base (336).

2. The folding-spoon jig according to claim 1, characterized by: A plurality of guide grooves (110) are formed in the jig fixing plate (10).

3. The folding-spoon jig according to claim 1, characterized by: A sliding sleeve (3311) is fixedly arranged on the outer side of the shell (331), the sliding sleeve (3311) is sleeved on the slide shaft support (320) and slidably connected with the slide shaft support (320), and a top cover (3312) is installed at the top end of the shell (331).

4. The folding-spoon jig according to claim 1, characterized by: A shaft sleeve (3321) is fixedly arranged at the top end of the main shaft (332), the shaft sleeve (3321) is sleeved on the jacking frame (340) and slidably connected with the jacking frame (340), a sliding groove a (3322) is welded at the bottom end of the main shaft (332), and one end of the transmission crank (334) is slidably connected with the sliding groove a (3322).

5. The folding-spoon jig according to claim 1, characterized by: Side sealing plates (3331) are installed at the two ends of the slide rail (333).

6. The folding-spoon jig according to claim 1, wherein: The buffer module (335) includes a bidirectional lead screw (3351), a buffer spring (3352), an adjusting member (3353), and a sliding shaft (3354). The bidirectional lead screw (3351) is rotatably mounted on the side sealing plate (3331). A through groove is provided in the middle of the sliding rail (333), and the sliding shaft (3354) passes through the through groove. Both adjusting members (3353) are sleeved on the bidirectional lead screw (3351) and the sliding shaft (3354). The adjusting members (3353) are slidably connected to the sliding shaft (3354), and the adjusting members (3353) are threadedly connected to the bidirectional lead screw (3351). Both buffer springs (3352) are sleeved on the bidirectional lead screw (3351). One end of the bidirectional lead screw (3351) is equipped with an internal hexagonal nut (3355).

7. The folding-spoon jig according to claim 1, wherein: The top of the gripper seat (336) is fitted with a slide groove b (3361), and one end of the transmission crankshaft (334) is slidably connected to the slide groove b (3361).