Cylinder gel automatic rotary cutting machine and mandrel returning system

Abstract

The application discloses a cylindrical gel automatic rotary cutting machine and a mandrel returning system, and the rotary cutting machine comprises a buffer pool, a rotary cutting mechanism and the mandrel returning system. Through linkage movement of the cylindrical gel mandrel returning system and the rotary cutting mechanism, the gel is cut into pieces. The cylindrical gel mandrel returning system comprises an annular feeding chain, a mandrel, a limiting unit and a mandrel returning unit, the limiting unit is located below the annular feeding chain, and a mandrel feeding channel is formed between the limiting unit and the annular feeding chain; the mandrel returning unit is used for conveying the mandrel after finishing rotary cutting from the end of the annular feeding chain to the beginning; the mandrel is fed along the mandrel feeding channel from the beginning, and after finishing rotary cutting, the mandrel is conveyed back to the beginning by the mandrel returning unit. The application realizes automatic feeding and rotary cutting of the cylindrical gel by means of the buoyancy of water in the buffer pool and the pushing action of the annular feeding chain, and realizes automatic returning of the mandrel through the mandrel returning unit, so that automatic circulation of the mandrel is realized, the operation difficulty and labor intensity of workers are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco sheet adhesive production technology, specifically to an automatic rotary cutting machine for cylindrical gel and a mandrel return system. Background Technology

[0002] Smoked sheet rubber is a type of rubber sheet made from natural latex through processes such as coagulation, slicing, pressing, and smoking drying. There are two main methods for processing the sliced ​​natural latex blocks after coagulation:

[0003] One method involves cutting a block of raw rubber placed on a table from top to bottom with a blade, such as the rubber slicing device disclosed in CN220030330U. This cutting method is mainly for strip-shaped gels and cannot cut them into continuous sheets.

[0004] Another method involves using a rotary cutter to slice cylindrical gels into long strips, such as the cylindrical gel cutting device disclosed in CN119260835A. This device uses a circular feed chain to transport the cylindrical gel, with the cutter and conveyor roller in fixed positions. As the gel diameter decreases, it's crucial to ensure the cutter can cut the gel and the conveyor roller maintains contact with the gel while the cutter is cutting it. After cutting a cylindrical gel, the mandrel returns in two ways: one is to disconnect the transmission between the circular feed chain and the rotary cutter (clutch disengagement), then manually reverse the circular feed chain to allow the detachable (clamped) mandrel to retract along the feed path. This method relies on manual retraction of the mandrel, which is not conducive to continuous production. The other method involves the mandrel directly circulating back along the circular feed chain. However, due to structural and spatial limitations, this method can lead to unstable gel rotation during the cutting of the tail section or the cutter cutting the mandrel during its return stroke. In addition, when threading the cylindrical gel through the mandrel, the mandrel needs to be removed from the annular feed chain, and after passing through the cylindrical gel, the two ends of the mandrel are installed on the two chains respectively. This results in high labor intensity for workers and low feeding efficiency of the cylindrical gel. Summary of the Invention

[0005] To address the problems of existing cylindrical gel rotary cutting machines, such as the need for manual disassembly and assembly of the mandrel, repeated chain installation, reliance on manual reversal of the feed chain for recycling, and the susceptibility to interference in the circulation path, leading to high labor intensity, low feeding efficiency, limited continuous production, and unstable rotation of the gel's tail section, this invention provides an automatic cylindrical gel rotary cutting machine and mandrel return system. The core technology relies on the buoyancy of the buffer pool water and the driving force of its annular feed chain. A mandrel feeding channel is formed between the limiting unit and the annular feed chain. Through the combined action of the rotary cutting mechanism and the gel feeding, the cylindrical gel is rotary cut into uniformly thick sheet-like films. The rotary cutting process, coupled with an independent mandrel return unit, enables automatic mandrel return, constructing an automatic mandrel circulation and conveying system that allows for automated recycling and reuse of the mandrel. This significantly reduces the difficulty and labor intensity for workers, improves production efficiency, ensures the stability of the entire gel rotary cutting process, avoids interference between the mandrel return and the cutting tool, and adapts to the needs of continuous rotary cutting production.

[0006] An automatic rotary cutter for cylindrical gels and a mandrel return system, mainly comprising a rotary cutting mechanism, buffer teeth, an annular feed chain, and a mandrel for mounting cylindrical gels, and further comprising:

[0007] A limiting unit is located below the annular feed chain and below the water surface of the buffer pool, forming a spindle feed channel between the limiting unit and the annular feed chain;

[0008] The mandrel return unit is located below the limiting unit and is used to transport the mandrel after the cylindrical gel is cut from the end of the annular feed chain to the beginning. The mandrel is fed from the beginning of the annular feed chain along the mandrel feed channel. After the cylindrical gel is cut, it is transported back to the beginning of the annular feed chain by the mandrel return unit to form a mandrel cycle.

[0009] Furthermore, the mandrel return unit includes:

[0010] The guide section has its inlet end located at the outlet of the mandrel feed channel. The guide section is tilted downward as a whole to guide the mandrel downward.

[0011] The conveyor section is connected to the guide section;

[0012] The lifting section, connected to the conveying section, is used to lift the mandrel to the water surface, and its outlet end is located at the end of the annular feed chain away from the rotary cutting mechanism.

[0013] Furthermore, the mandrel return unit includes:

[0014] Return to the chain unit;

[0015] The return guide plate is located below the return chain unit and forms a spindle return channel with the return chain unit.

[0016] Furthermore, the return chain unit includes:

[0017] The first sprocket is located below the outlet of the spindle feed channel;

[0018] The second sprocket is located below the first sprocket, and the two form a downward-sloping guide section;

[0019] The third sprocket is arranged parallel to the second sprocket, forming a horizontal conveyor section between them;

[0020] The fourth sprocket is located above the third sprocket, forming a lifting section between them. The first, second, third, and fourth sprockets are connected by chain drive.

[0021] Furthermore, the return guide plate is arranged along the first sprocket, the second sprocket, the third sprocket and the fourth sprocket, and forms a spindle return channel with the chain.

[0022] Furthermore, the limiting unit is a limiting plate, and the inlet end of the limiting plate is provided with a feed guide plate, which is used to guide the mandrel into the mandrel feed channel.

[0023] Furthermore, the mandrel feed channel is U-shaped, so that the mandrel follows a feed path that first goes downward, then parallel, and finally tilts upward.

[0024] Furthermore, the outlet end of the limiting plate is provided with a first guide plate that bends downward, and a second guide plate is provided at a relative position to the first guide plate, forming a guide channel between the first guide plate and the second guide plate for guiding the mandrel into the mandrel return unit.

[0025] Furthermore, both the annular feed chain and the mandrel return unit are equipped with push plates, which are used to push the mandrel to move.

[0026] According to a second aspect, the present invention also provides a cylindrical gel rotary cutter, comprising: a buffer pool, a rotary cutting mechanism, and the aforementioned cylindrical gel mandrel return system, wherein the cylindrical gel mandrel return system is located within the buffer pool.

[0027] According to a third aspect, the present invention also provides an automatic rotary slicing machine for cylindrical gels and a method for controlling the slicing into sheets. During automatic rotary slicing of cylindrical gels, as the slicing progresses, the diameter of the cylindrical gel becomes smaller and smaller. To ensure that the cylindrical gel can be sliced ​​into sheets of the same thickness at different diameters, the gel feed speed needs to be continuously increased as the gel diameter decreases. Therefore, a first proximity switch and a second proximity switch are provided above the annular feed chain, arranged along the return path of the hook-shaped component, for detecting the hook-shaped component.

[0028] Let the diameter of gel 7 be D, the thickness of gel 7 be kept at h mm, and its linear velocity be v mm / s. That is, the diameter of gel 7 decreases by 2h mm per revolution. The relationship between the diameter of the cylindrical gel and time is as follows:

[0029] ;

[0030] Assuming the tool position remains fixed, gel 7 is fed radially at a speed that is half the diameter reduction speed, increasing in speed. A positive value is used.

[0031] ;

[0032] Substituting the original D(t), we obtain the relationship between the radial feed rate of gel 7 and time:

[0033] ;

[0034] Using this speed as the feed speed of the annular feed chain 3, with the pitch circle diameter of its driving sprocket being d, the relationship between the driving sprocket speed n and time can be obtained:

[0035] This allows for the continuous feeding of cylindrical gel while maintaining the ability to cut gel sheets of the same thickness as the diameter decreases. The specific method is as follows:

[0036] Step 1: Start the rotary cutting mechanism and the annular feed chain at the rated speed;

[0037] Step 2: When the feed pusher triggers the first proximity switch, the rotational speed of the annular feed chain is adjusted to... Where D0 is the initial diameter of the gel, h is the feed rate of the gel, v is the linear velocity of gel d, d is the pitch circle diameter of the driving sprocket of the annular feed chain, and t is time.

[0038] As the rotary cutting progresses, when the feed pusher plate triggers the second proximity switch, the annular feed chain returns to its rated speed, and this cycle repeats (feed pusher plate 31 triggers the first proximity switch → speed adjustment to...). →The feed pusher triggers the second proximity switch until production is complete.

[0039] The specific workflow of this invention is as follows:

[0040] At the start of S1, the upstream component places the gel 7 to be rotary cut into the buffer pool 2;

[0041] S2 manually inserts the cylindrical gel 7 onto the mandrel 6, places the mandrel 6 on the front feed guide plate 41 and pushes it forward, so that the mandrel 6 with gel 7 enters the mandrel feed channel 43 between the bottom chain of the annular feed chain 3 and the limiting plate 4. With the transmission of the chain, the gel 7 is fed forward along the mandrel feed channel 43 by the feed push plate 31 on the chain.

[0042] S3 When gel 7 contacts the cutting tool, gel 7 also contacts the conveyor roller 11. Because gel 7 is soft, it will not rotate at the moment of contact. As the chain continues to advance, when gel 7 is squeezed by conveyor roller 11, it begins to rotate under the action of friction. At the same time, the cutting tool has already cut gel 7 to a certain depth. At this time, through the cooperation of the cutting tool and conveyor roller 11, the cylindrical gel can be rotary cut into sheet gel.

[0043] S4 sheet-like gel automatically enters the rear water tank for cleaning;

[0044] As gel 7 is continuously cut, its diameter decreases. To more clearly illustrate the technical solution, this embodiment uses exemplary parameters, which are only one example. When the diameter decreases to the last cut, the diameter of the cylindrical gel is approximately equal to the diameter of the mandrel. Under the squeezing and pulling action of the discharge roller and the conveyor roller 11 of the rotary cutting mechanism 1, the remaining gel can be removed from the mandrel 6. At this time, the mandrel 6 also reaches the end of the mandrel feed channel 43. As the chain continues to feed, the mandrel 6 immediately leaves the mandrel feed channel 43 and enters the mandrel return unit.

[0045] S6 uses the chain drive of the mandrel return unit to automatically recycle the mandrel 6 from the bottom of the buffer pool 2 back to its initial position via the return push plate 58. Then, the next gel to be cut can be inserted onto the mandrel 6 manually. This cycle is repeated to complete the continuous cutting of the gel.

[0046] Working principle:

[0047] After the cylindrical gel is fed into the buffer tank (the gel floats on the water due to buoyancy), the cylindrical gel is manually fixed by a mandrel. Then, the gel is pushed from the feed guide plate into the mandrel feed channel. Simultaneously, the annular feed chain moves, pushing the mandrel's ends along the mandrel feed channel via pushers until it reaches the rotary cutting mechanism for cutting. After the gel is cut, the mandrel is pushed into the guide section of the mandrel return unit. Under the action of the pushers in the mandrel return unit, it moves along the mandrel return channel, is lifted to a high position by the lifting section, and then falls back into the buffer tank for the next gel to pass through the mandrel.

[0048] The beneficial effects of this invention are:

[0049] Ⅰ. Through the coordinated movement of the cylindrical gel feeding mechanism and the rotary cutting mechanism, the cylindrical gel is rotary cut into sheet-like films;

[0050] II. The mandrel is fed from the beginning of the annular feed chain along the mandrel feed channel. After the cylindrical gel is cut, it is transported back to the beginning of the annular feed chain by the mandrel return unit, forming a mandrel cycle. This reduces the process of flipping the chain to retrieve the mandrel, reduces the difficulty and labor intensity of the workers, and improves work efficiency.

[0051] III. During rotary cutting, as the diameter of the gel continuously decreases, it is necessary to ensure that the thickness of the gel remains constant. This provides a precise gel feeding kinematic control method for sheet thickness, which can ensure that the gel thickness and the discharge speed after rotary cutting remain consistent as the gel diameter continuously decreases. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the cylindrical gel rotary cutter in Example 1;

[0053] Figure 2 This is a cross-sectional view of the cylindrical gel rotary cutter in Example 1;

[0054] Figure 3 This is a schematic diagram of the cylindrical gel mandrel return system in Example 1;

[0055] Figure 4 This is a partial schematic diagram of the guide segment in Example 1;

[0056] Figure 5 This is the control logic diagram of the cylindrical gel rotary cutter in Example 1.

[0057] Figure label:

[0058] 1-Rotary cutting mechanism; 11-Material roller; 2-Buffer pool; 3-Annular feed chain; 31-Feed push plate; 4-Limiting plate; 41-Feed guide plate; 42-First guide plate; 43-Mandrel feed channel; 5-Mandrel return unit; 51-Return motor; 52-Guide section; 521-Second guide plate; 53-Conveying section; 54-Lifting section; 55-Mandrel return channel; 561-First sprocket; 562-Second sprocket; 563-Third sprocket; 564-Fourth sprocket; 565-Tension sprocket; 57-Return guide plate; 58-Return push plate; 6-Mandrel; 7-Gel; M1-Rotary cutting motor; M2-Material roller drive geared motor; M3-Chain feed geared motor. Detailed Implementation

[0059] The following description, in conjunction with the accompanying drawings, further illustrates the process of continuous rotary cutting of cylindrical gels according to the present invention.

[0060] Example 1

[0061] like Figure 1 As shown, this embodiment discloses a cylindrical gel rotary slicing machine, including: a buffer pool 2, a rotary slicing mechanism 1, and a cylindrical gel mandrel return system. The buffer pool 2 is located on the feeding side of the rotary slicing mechanism 1 and contains water. After the cylindrical gel 7 is fed into the buffer pool 2, the gel 7 is suspended on the water due to buoyancy, which facilitates the movement of the gel 7 and the subsequent threading operation of the mandrel 6. The cylindrical gel mandrel return system is located in the buffer pool 2 and is used to send the gel 7 to the rotary slicing mechanism 1. The gel 7 contacts the conveyor roller 11 of the rotary slicing mechanism 1. The conveyor roller 11 rotates, causing the gel 7 to rotate around the mandrel 6. At the same time, the rotary slicing blade of the rotary slicing mechanism 1 cuts the rotating gel 7. While cutting, the gel 7 continues to be fed, thereby realizing the continuous slicing of the cylindrical gel 7.

[0062] like Figure 2-3 As shown, the cylindrical gel mandrel return system includes an annular feed chain 3, a mandrel 6 for mounting gel 7, a limiting unit, and a mandrel return unit. The limiting unit is a limiting plate 4, located below the annular feed chain 3, and the entire unit is below the water surface. It forms a mandrel feeding channel 43 with the bottom chain of the annular feed chain 3. The inlet end of the limiting plate 4 is provided with a feeding guide plate 41. The inlet end of the feeding guide plate 41 is inclined from bottom to top to adapt to the position of the mandrel 6 in the water, making it convenient for workers to move the mandrel 6 and the gel 7 on it into the mandrel feeding channel 43.

[0063] In the existing method of circulating the mandrel along the annular feed chain 3, since the mandrel 6 needs to pass under the conveyor roller 11, a sufficient gap must be left between the conveyor roller 11 and the mandrel 6. At the same time, to ensure contact between the conveyor roller and the gel, the relative position of the conveyor roller 11 and the mandrel is strictly controlled; otherwise, problems such as unstable gel rotation during gel tail cutting or interference during the mandrel return will occur. To solve this problem, in this embodiment, the limiting plate 4 is designed as a U-shape, so that the mandrel 6 follows a feed path that first moves downwards, then parallel, and finally tilts upwards. The exit section of the limiting plate 4 is tilted upwards to convey the gel 7 from bottom to top towards the conveyor roller 11, so that the conveyor roller 11 can stably drive the gel 7 to rotate, while the mandrel 6 returns from below. This improves the gel cutting stability and avoids interference problems. This embodiment selects exemplary parameters for detailed description. The distance between the cutter and the conveyor roller 11 of the rotary cutting mechanism 1 is 20mm, which ensures that the thickness of the cut film is 20mm. The diameter of the mandrel 6 is 160mm, and the diameter of the gel 7 is 500mm. When the mandrel 6 moves to the end of the mandrel feed channel 43, the gap between the cutter and the mandrel 6 is 5mm. That is, when the gel 7 is cut to a diameter of 170mm, the mandrel 6 is disengaged from the mandrel feed channel 43. At this time, the last cut is completed, and the cutter can be prevented from cutting the mandrel 6.

[0064] Feed pushers 31 are installed on the chain of the annular feed chain 3. The interval between two adjacent feed pushers 31 is 640mm. The feed pushers 31 are located on the inner side of the chain (in the chain width direction, on the side closer to the inside of the buffer pool 2). The feed pushers 31 push the end of the mandrel 6 to move the mandrel 6 and the gel 7. During the feeding process, due to the restriction of the mandrel feed channel, the mandrel 6 and the gel 7 are slightly pressed down. The mandrel 6 and the gel 7 are automatically pushed upward by the buoyancy, so that the end of the mandrel 6 will abut against the chain of the annular feed chain 3. While realizing the automatic conveying of the mandrel 6, the fluctuation of the mandrel 6 is reduced, which effectively improves the stability of the mandrel during the conveying process.

[0065] A first proximity switch J1 and a second proximity switch J2 are arranged above the annular feed chain 3, along the return path of the feed pusher 31, for detecting the feed pusher 31. The distance between them is 185mm. In this embodiment, the feed amount of gel 7 is h=20mm, the linear velocity of gel 7 is v=190mm / s, the pitch circle diameter of the driving sprocket of the annular feed chain 3 is d=116.59mm, and the initial diameter of gel 7 is D0=500mm. Therefore, in this embodiment, the relationship between the rotational speed of the chain feed reduction motor M3 and time during rotary cutting is as follows:

[0066] .

[0067] like Figure 5 As shown, the veneer cutting process of this veneer cutting machine is as follows:

[0068] The rotary cutting motor M1 (rated speed 1450 r / min), the belt roller drive geared motor M2 (rated speed 1450 r / min, reduction ratio: 1:32), and the chain feed geared motor M3 (rated speed 1450 r / min, reduction ratio: 1:69) all start at their rated speeds.

[0069] When the feed pusher 31 triggers the first proximity switch J1, the speed of the chain feed reduction motor M3 is adjusted to... (At initial contact, t=0), as the rotary cutting proceeds, when the feed pusher 31 triggers the second proximity switch J2, the chain feed reduction motor M3 returns to its rated speed, and this cycle repeats (feed pusher 31 triggers the first proximity switch J1 → speed adjusted to...). →The feed pusher plate 31 triggers the second proximity switch J2) until production is complete. This veneer laminator can control the running speed of the feed chain according to the veneer requirements (fast and slow speeds are adjustable). The slow speed is suitable for precise positioning when the gel just contacts the blade, which can improve the veneer quality and ensure the veneer thickness; the fast speed is used to stabilize the veneer stage to improve efficiency, while allowing the next gel to quickly enter the veneer station, reducing the handover time between gels and improving production efficiency.

[0070] The outlet end of the limiting plate 4 is provided with a downwardly bent first guide plate 42, and a second guide plate 521 is provided at the opposite position of the first guide plate 42. A vertically arranged guide channel is formed between the first guide plate 42 and the second guide plate 521. This guide channel is used to guide the mandrel 6 into the mandrel return unit, so that the mandrel 6 can transition from the mandrel feed channel 43 to the mandrel return channel 55. This solves the problem that the mandrel 6 shakes or shifts in position at the turning point due to the influence of water flow, making it inconvenient for it to enter the mandrel return channel 55 later.

[0071] Similar to the annular feed chain 3, the mandrel return unit 5 uses two opposing chain drive pairs to drive both ends of the mandrel 6, thus achieving the conveying function of the mandrel 6. The mandrel return unit 5 consists of a guide section 52, a conveying section 53, and a lifting section 54. The guide section 52 is connected to the guide channel and is tilted downwards to guide the mandrel 6 to the bottom of the pool, thereby avoiding interference with the gel 7 during the feeding process. The mandrel 6 is conveyed by the conveying section 53 to the lifting section 54, and then lifted to a high position by the lifting section 54, finally falling into the water surface of the buffer pool 2, completing the movement process of the mandrel 6 from the end of the annular feed chain 3 to the beginning of the annular feed chain 3.

[0072] Specifically, the spindle return unit 5 includes a return motor 51, a return guide plate 57, and a return chain unit (chain drive pair) composed of a first sprocket 561, a second sprocket 562, a third sprocket 563, a fourth sprocket 564, three tension sprockets 565, and a chain. The guide section 52 is between the first sprocket 561 and the second sprocket 562; the conveying section 53 is between the second sprocket 562 and the third sprocket 563; and the lifting section 54 is between the third sprocket 563 and the fourth sprocket 564. The fourth sprocket 564 is connected to the return motor 51, which drives the entire chain drive pair. A return push plate 58 is provided on the chain of the spindle return unit 5. The return push plate 58 is located on the inner side of the chain (in the chain width direction, closer to the inside of the buffer pool 2), ensuring that the end of the spindle 6 can be pushed while avoiding interference between the return push plate 58 and the tension sprockets 565, thus preventing normal operation. The return guide plate 57 is arranged along the route of the first sprocket 561, the second sprocket 562, the third sprocket 563, and the fourth sprocket 564, forming a spindle return channel 55 between itself and the chain of the spindle return unit 5, thus creating a bottom-parallel-upward return route for the spindle 6. The position of the return guide plate 57 near the fourth sprocket 564 is an arc shape concentric with the fourth sprocket 564, used to guide the spindle 6 into the buffer pool 2 so that the spindle 6 can fall back into the buffer pool 2.

[0073] The specific working process of this veneer laminator is as follows:

[0074] ①At the beginning, the upstream puts the gel 7 to be cut into the buffer pool 2.

[0075] ② Manually insert the cylindrical gel 7 onto the mandrel 6, place the mandrel 6 on the front feed guide plate 41 and push it forward, so that the mandrel 6 with gel 7 enters the mandrel feed channel 43 between the bottom chain of the annular feed chain 3 and the limiting plate 4. With the transmission of the chain, the gel 7 is fed forward along the mandrel feed channel 43 by the feed push plate 31 on the chain.

[0076] ③ When gel 7 comes into contact with the cutting tool, gel 7 also comes into contact with the conveyor roller 11. Because gel 7 is soft, it will not rotate at the moment of contact. As the chain continues to advance, when gel 7 is squeezed by the conveyor roller 11, it begins to rotate under the action of friction. At the same time, the cutting tool has already cut gel 7 to a certain depth. At this time, through the cooperation of the cutting tool and the conveyor roller 11, the cylindrical gel can be rotary cut into sheet gel.

[0077] ④ The sheet-like gel automatically enters the rear water tank for cleaning.

[0078] ⑤ As the gel 7 is continuously rotary-cut, its diameter decreases. When the final cut is made, the diameter of the cylindrical gel is approximately 170 mm, while the diameter of the mandrel 6 is 160 mm. Under the squeezing and pulling action of the discharge roller and the conveyor roller 11 of the rotary-cutting mechanism 1, the remaining gel can be removed from the mandrel 6. At this time, the mandrel 6 also reaches the end of the mandrel feed channel 43. As the chain continues to feed, the mandrel 6 immediately disengages from the mandrel feed channel 43 and enters the mandrel return unit.

[0079] ⑥ Through the chain drive of the mandrel return unit, the return push plate 58 automatically retrieves the mandrel 6 from the bottom of the buffer pool 2 back to the initial position. Then, the next gel to be cut can be inserted onto the mandrel 6 manually. This cycle is repeated to complete the continuous cutting of the gel.

[0080] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of the invention. Any modifications, equivalent substitutions, or simple deductions, variations, or substitutions made by those skilled in the art based on the concept of this invention should be included within the scope of protection of this invention.

Claims

1. A cylindrical gel mandrel return system, comprising an annular feed chain (3) and a mandrel (6) for mounting gel (7), characterized in that, Also includes: The limiting unit is located below the annular feed chain (3) and below the water surface of the buffer pool (2). The limiting unit and the annular feed chain (3) form a spindle feed channel (43). The mandrel return unit (5) is located below the limiting unit and is used to transport the mandrel (6) after the gel (7) has been cut from the end to the beginning of the annular feed chain (3). The mandrel (6) is fed from the beginning of the annular feed chain (3) along the mandrel feed channel (43). After the gel (7) has been cut, it is transported back to the beginning of the annular feed chain (3) by the mandrel return unit (5) to form a cycle of the mandrel (6).

2. The cylindrical gel mandrel return system as described in claim 1, characterized in that, The spindle return unit (5) includes: The guide section (52) has its inlet end located at the outlet of the mandrel feed channel (43). The guide section (52) is inclined downward as a whole to guide the mandrel (6) downward. The conveying section (53) is connected to the guiding section (52); The lifting section (54), connected to the conveying section (53), is used to lift the mandrel (6) to the water surface, and its outlet end is located at the end of the annular feed chain (3) away from the rotary cutting mechanism (1).

3. The cylindrical gel mandrel return system as described in claim 2, characterized in that, The spindle return unit (5) includes: Return to the chain unit; The return guide plate (57) is located below the return chain unit and forms a spindle return channel (55) with the return chain unit.

4. The cylindrical gel mandrel return system as described in claim 3, characterized in that, The return chain unit includes: The first sprocket (561) is located below the outlet of the spindle feed channel (43); The second sprocket (562) is located below the first sprocket (561), and a downwardly sloping guide section (52) is formed between the two. The third sprocket (563) is arranged in parallel with the second sprocket (562), forming a horizontal conveying section (53) between them. The fourth sprocket (564) is located above the third sprocket (563), forming a lifting section (53) between them. The first sprocket (561), the second sprocket (562), the third sprocket (563) and the fourth sprocket (564) are connected by chain drive.

5. The cylindrical gel mandrel return system as described in claim 4, characterized in that, The return guide plate (57) is arranged along the first sprocket (561), the second sprocket (562), the third sprocket (563) and the fourth sprocket (564), and forms a spindle return channel (55) with the chain.

6. The cylindrical gel mandrel return system as described in claim 1, characterized in that, The limiting unit is a limiting plate (4), and the inlet end of the limiting plate (4) is provided with a feed guide plate (41). The feed guide plate (41) is used to guide the mandrel (6) into the mandrel feed channel (43).

7. The cylindrical gel mandrel return system as described in claim 6, characterized in that, The mandrel feed channel (43) is U-shaped so that the mandrel (6) follows a feed path that is first downward, then parallel, and finally inclined upward.

8. The cylindrical gel mandrel return system as described in claim 6, characterized in that, The outlet end of the limiting plate (4) is provided with a first guide plate (42) that bends downwards, and a second guide plate (521) is provided at the opposite position of the first guide plate (42). A guide channel for guiding the mandrel (6) into the mandrel return unit (5) is formed between the first guide plate (42) and the second guide plate (521).

9. The cylindrical gel mandrel return system as described in claim 1, characterized in that, Both the annular feed chain (3) and the spindle return unit (5) are equipped with push plates, which are used to push the spindle (6) to move.

10. A cylindrical gel rotary cutter, characterized in that, include: The buffer pool (2), the rotary cutting mechanism (1), and the cylindrical gel mandrel return system according to any one of claims 1-9, wherein the cylindrical gel mandrel return system is located within the buffer pool (2).

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