An automatic feeding device for flat cutting machining
Patent Information
- Application Number
- CN202411150375.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2044-08-21
AI Technical Summary
[0004]该申请通过加工台带动海绵移动完成切割,但是缺少对海绵的有效支撑,仅靠海绵与加工台之间的静摩擦力保持相对静止,可能会造成海绵的偏移并影响加工质量,存在一定的使用局限性
[0018]与现有技术相比,本发明的有益效果是:通过机架、调节组件、支撑组件和同步组件等之间的配合,可提供推动力实现对海绵的稳定输送,保证切刀对海绵的切割效果;可使得支撑组件与切刀的调整保持同步,使得支撑组件的顶面始终低于切刀,在保证对海绵稳定输送的基础上,还可有效避免与切刀发生干涉,整体的实用性更高。
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Figure CN119077836B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of flat cutting machine technology, and in particular to an automatic feeding device for flat cutting machine processing. Background Technology
[0002] A sponge flat cutter is a device used to cut sponge products into pieces. The sponge to be cut is placed on a worktable, and the reciprocating motion of the worktable drives the sponge through the cutter on the cutter holder. The sponge and the worktable are kept relatively still by static friction. When the sponge passes through the cutter, the sponge is cut.
[0003] For example, Chinese Patent Publication No. CN214446777U discloses a machine called a sponge flat-cutting machine, which includes a frame and a processing table for supporting sponges; the processing table is slidably connected to the frame; a blade holder is arranged above the processing table, and a blade belt is rotatably connected inside the blade holder; the blade belt abuts against the outer wall of the sponge near the blade holder; a pressure roller is rotatably connected to the blade holder, and the pressure roller is arranged horizontally on the side of the blade belt near the sponge; the axis of the pressure roller is perpendicular to the sliding direction of the processing table; the bottom end of the pressure roller abuts against the top surface of the sponge, and the pressure roller applies pressure to the sponge towards the processing table. This design effectively improves the situation where the sponge placed on the processing table is not effectively restrained.
[0004] The application uses a processing table to move a sponge to complete the cutting process, but it lacks effective support for the sponge and relies solely on the static friction between the sponge and the processing table to keep it relatively stationary. This may cause the sponge to shift and affect the processing quality, thus limiting its application.
[0005] Therefore, it is necessary to provide an automatic feeding device for flat cutting machine processing to solve the above-mentioned technical problems. Summary of the Invention
[0006] The purpose of this invention is to provide an automatic feeding device for flat cutting machine processing, so as to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, an automatic feeding device for flat cutting machines is designed to effectively push the sponge, prevent sponge displacement, and ensure cutting quality.
[0008] Based on the above ideas, the present invention provides the following technical solution: an automatic feeding device for flat cutting machine processing, including a frame, a cutter for cutting sponge, and a pressure roller for limiting sponge movement. The frame is provided with a support component for conveying sponge and an adjustment component for driving the pressure roller and cutter to move. The adjustment component is provided with a synchronization component fixedly connected to the support component. The frame is provided with a control module for driving the support component to move. When the adjustment component drives the cutter to rise and fall, the synchronization component can realize the automatic avoidance of the cutter by the support component.
[0009] As a further aspect of the present invention: the support component includes a base plate driven by a control module, an opening is provided on the rear side of the base plate, and a partition plate fixedly connected to the synchronization component is slidably installed in the opening.
[0010] As a further aspect of the present invention: the height dimension of the partition based on the base plate is lower than the height dimension of the cutter based on the base plate.
[0011] As a further aspect of the present invention: the synchronization component includes a sleeve fixedly connected to the slide block, a horizontal axis is horizontally slidably mounted inside the sleeve, a connecting rod fixedly mounted on the surface of the horizontal axis and fixedly connected to the partition plate, and a notch is provided on the surface of the sleeve to allow the connecting rod to pass through.
[0012] As a further aspect of the present invention: the distance between the bottom surface of the horizontal axis and the top surface of the partition is less than or equal to the depth of the opening based on the bottom plate.
[0013] As a further aspect of the present invention: the adjustment assembly includes a motor fixedly connected to the frame, the output shaft of the motor is fixedly mounted with a first lead screw that rotates with the frame, the outer surface of the first lead screw is threaded with a slide block that slides with the frame and is fixedly connected to a sleeve, and the cutter is fixedly mounted on the slide block.
[0014] As a further aspect of the present invention, the adjusting assembly further includes a transmission assembly for accommodating the pressure roller, wherein the transmission assembly causes the pressure roller and the cutter to move in opposite directions, and the travel of the pressure roller is equal to the travel of the cutter.
[0015] As a further embodiment of the present invention: the transmission assembly includes a support rod that rotates with the slide, a first gear fixedly mounted on the outer surface of the first lead screw, and a second gear rotately mounted on the frame. The second gear meshes with the first gear and is driven coaxially with the support rod. The outer surface of the support rod is threaded with a block that slides with the slide and is used to place the pressure roller.
[0016] As a further aspect of the present invention: the second gear and the support rod are keyed together, so that the first gear, the second gear and the support rod can rotate synchronously, and the second gear and the support rod can slide up and down relative to each other.
[0017] As a further aspect of the present invention: a second lead screw is rotatably mounted on the surface of the block, and a chuck is threaded on the outer surface of the second lead screw to allow the pressure roller to move and engage. The pressure roller can rotate on its own based on the chuck, and the chuck can drive the pressure roller to move up and down.
[0018] Compared with the prior art, the beneficial effects of the present invention are: through the cooperation between the frame, adjustment component, support component and synchronization component, a driving force can be provided to achieve stable delivery of the sponge and ensure the cutting effect of the cutter on the sponge; the adjustment of the support component and the cutter can be synchronized, so that the top surface of the support component is always lower than the cutter. While ensuring stable delivery of the sponge, interference with the cutter can also be effectively avoided, and the overall practicality is higher. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base plate and opening structure of the present invention; Figure 3 for Figure 1 Enlarged view of the structure at point A in the middle; Figure 4 This is a schematic diagram of the base plate and partition structure of the present invention; Figure 5 This is a schematic diagram of the frame and slide structure of the present invention; Figure 6 for Figure 5 Enlarged view of the structure at point B in the middle; Figure 7 This is a schematic diagram of the slide and block structure of the present invention; Figure 8 This is a schematic diagram of the block, the second lead screw, and the clamp structure of the present invention; Figure 9 This is a schematic diagram of the upper and lower rod structures of the present invention; Figure 10 This is a schematic diagram of the snap-fit assembly structure of the present invention.
[0020] In the diagram: 1. Frame; 2. Pressure roller; 3. Cutter; 4. Adjustment assembly; 5. Support assembly; 6. Control module; 7. Synchronization assembly; 8. Transmission assembly; 9. Engaging assembly; 401. Motor; 402. First lead screw; 403. Slide; 501. Base plate; 502. Partition plate; 503. Opening; 701. Sleeve; 702. Horizontal shaft; 703. Connecting rod; 801. Support rod; 802. First gear; 803. Second gear; 804. Block; 8011. Upper rod; 8012. Lower rod; 8013. Slot; 8041. Second lead screw; 8042. Chuck; 901. Locking block; 902. Spring. Detailed Implementation Example
[0021] Please see Figures 1 to 4This invention provides an automatic feeding device for flat cutting machine processing, mainly used to achieve effective conveying of sponge. The device includes a frame 1, a cutter 3 for cutting sponge and a pressure roller 2 for limiting sponge position. The frame 1 is provided with a support component 5 for conveying sponge and an adjustment component 4 for driving the pressure roller 2 and cutter 3 to move. The adjustment component 4 is provided with a synchronization component 7 fixedly connected to the support component 5. The frame 1 is also provided with a control module 6 for driving the support component 5 to move.
[0022] In application, the sponge is placed on the support assembly 5, and the control module 6 supports the synchronous movement of the support assembly 5 and the sponge. During the movement, the sponge passes through the cutter 3 and the pressure roller 2. The pressure roller 2 contacts the top surface of the sponge to achieve a limiting position, and the cutter 3 performs the cutting operation. The positions of the cutter 3 and the pressure roller 2 can be adjusted by the adjustment assembly 4 to meet the corresponding cutting requirements; it can be understood that the cutter 3 is located below the pressure roller 2.
[0023] During the above process, the support component 5 can contact the side of the sponge away from the cutter 3, thereby providing a pushing force to the sponge and ensuring the stable movement of the sponge. The positions of the support component 5 and the cutter 3 are staggered vertically. When the adjustment component 4 drives the cutter 3 to adjust in the vertical direction, the synchronization component 7 can realize the automatic avoidance of the cutter 3 by the support component 5, so that the support component 5 can not only effectively push the sponge, but also achieve stable delivery of the sponge.
[0024] In this embodiment, the control module 6 can realize the reciprocating movement of the support component 5 along the frame 1. It can be an existing reciprocating screw mechanism, or a cylinder or electric push rod, as long as it can realize the reciprocating movement of the support component 5. These are all existing mature technologies and will not be described in detail here.
[0025] Reference Figure 1 and Figure 2 In this embodiment, preferably, the support component 5 includes a base plate 501 driven by the control module 6. An opening 503 is provided on the rear side of the base plate 501, and a partition 502 fixedly connected to the synchronization component 7 is slidably installed in the opening 503 along the vertical direction. The partition 502 is used to contact the rear side of the sponge, and the partition 502 can be raised and lowered synchronously with the synchronization component 7 along the opening 503.
[0026] It should be noted that the height of the partition 502 based on the base plate 501 is lower than the height of the cutter 3 based on the base plate 501, and is in a slightly lower position, so that when the partition 502 pushes the sponge to be cut by the cutter 3, the partition 502 will not interfere with the cutter 3, and the partition 502 can provide good pushing for the sponge.
[0027] Reference Figure 1 and Figure 2In this embodiment, preferably, the adjustment component 4 includes a motor 401 fixedly connected to the frame 1. The output shaft of the motor 401 is fixedly mounted with a first lead screw 402 that rotates with the frame 1. The outer surface of the first lead screw 402 is threaded with a slide block 403 that slides vertically with the frame 1. The pressure roller 2 and the cutter 3 are disposed on the slide block 403. The first lead screw 402 is rotated by the motor 401, thereby driving the slide block 403, the pressure roller 2 and the cutter 3 to achieve vertical position adjustment.
[0028] The synchronization component 7 is fixedly connected to the slide 403, so that when the slide 403 moves up and down, the partition 502 can be moved accordingly through the synchronization component 7.
[0029] Reference Figures 2 to 4 In this embodiment, preferably, the synchronization component 7 includes a sleeve 701 fixedly connected to the slide block 403, a horizontal shaft 702 is slidably installed inside the sleeve 701, and a connecting rod 703 fixedly connected to the partition plate 502 is fixedly installed on the surface of the horizontal shaft 702; the horizontal shaft 702 can slide left and right based on the sleeve 701, and the slide block 403 can drive the horizontal shaft 702 and the connecting rod 703 to move up and down through the sleeve 701.
[0030] In the above structure, the front surface of the sleeve 701 is provided with a notch for the connecting rod 703 to pass through. Therefore, the length of the notch along the vertical direction of the sleeve 701 is greater than or equal to the length of the connecting rod 703 along the vertical direction of the sleeve 701, so that the horizontal shaft 702 can drive the connecting rod 703 to pass through the sleeve 701.
[0031] Furthermore, refer to Figure 4 The distance between the bottom surface of the horizontal axis 702 and the top surface of the partition 502 is less than or equal to the depth of the opening 503 based on the bottom plate 501, so that the connecting rod 703 can drive the partition 502 to descend to a state flush with the bottom plate 501. At this time, the top surface of the partition 502 is flush with the top surface of the bottom plate 501, which facilitates the transfer of the sponge on the bottom plate 501.
[0032] In use, the sponge is placed on the base plate 501 and placed against the partition plate 502. Then, the control module 6 is activated to move the base plate 501, partition plate 502, and sponge to the left. During the leftward movement, the pressure roller 2 provides a limit, and the cutter 3 cuts to the corresponding thickness. When the motor 401 is started, the cutter 3 and the pressure roller 2 are adjusted up and down through the first lead screw 402 and the slide 403. The slide 403 can drive the partition plate 502 to rise and fall synchronously through the sleeve 701, the horizontal shaft 702, and the connecting rod 703, so that the top surface of the partition plate 502 is always lower than the cutter 3, avoiding interference with the cutter 3.
[0033] In summary, the combination of structures such as slide 403, sleeve 701, base plate 501, and partition 502 provides a driving force to achieve stable delivery of the sponge, avoiding deviation and ensuring the cutting effect of the cutter 3 on the sponge; it also allows the partition 502 to be adjusted synchronously with the cutter 3, ensuring that the top surface of the partition 502 is always lower than the cutter 3. While ensuring stable delivery of the sponge, it can also effectively avoid interference with the cutter 3, resulting in higher overall practicality. Example
[0034] Please see Figures 1 to 8 Based on Example 1, after cutting, the topmost cut material needs to be removed immediately, otherwise it will affect the contact limit of the pressure roller 2 on the sponge to be cut. This means that the material needs to be moved once for each cut, resulting in low overall efficiency and a heavy workload.
[0035] Therefore, the placement of the pressure roller 2 is improved: the adjusting assembly 4 now includes a transmission assembly 8 for placing the pressure roller 2. The transmission assembly 8 ensures that the pressure roller 2 and the cutter 3 move in opposite directions, and the travel distance of the pressure roller 2 is equal to the travel distance of the cutter 3. Through this design, when the cutter 3 descends one notch, it drives the pressure roller 2 to descend one notch via the transmission assembly 8. The transmission assembly 8 can also drive the pressure roller 2 to rise one notch in the opposite direction, thus achieving the initial contact position with the sponge and ensuring that the pressure roller 2 neither rises nor falls.
[0036] Reference Figure 5 and Figure 7 In this embodiment, preferably, the transmission assembly 8 includes a support rod 801 that rotatably engages with the slide 403, a first gear 802 fixedly mounted on the outer surface of the first lead screw 402, and a second gear 803 rotatably mounted on the frame 1. The second gear 803 meshes with the first gear 802 and is coaxially driven with the support rod 801.
[0037] In this embodiment, the second gear 803 and the support rod 801 are keyed together, allowing the first gear 802 to drive the support rod 801 to rotate via the second gear 803, and the second gear 803 and the support rod 801 can slide relative to each other up and down. The outer surface of the support rod 801 is threaded with a block 804 that slides with the slide block 403 and is used to mount the pressure roller 2. When the support rod 801 rotates, the pressure roller 2 can be raised or lowered via the block 804.
[0038] Furthermore, refer to Figure 8To adjust the time interval between the pressure roller 2 and the cutter 3 in the initial state, a second lead screw 8041 is rotatably mounted on the surface of the block 804. A chuck 8042 is threaded onto the outer surface of the second lead screw 8041 for engaging with the pressure roller 2. A handle is fixedly mounted on the top of the second lead screw 8041 to facilitate its rotational adjustment. It is understood that the top of the second lead screw 8041 extends into the frame 1, and may even be designed to penetrate the frame 1.
[0039] In the above structure, the side of the chuck 8042 can be a concave circle, adapted to the shape of the pressure roller 2, so that the pressure roller 2 can rotate based on the chuck 8042, and the chuck 8042 can drive the pressure roller 2 to move up and down. Thus, when the second lead screw 8041 is rotated by the handle, the pressure roller 2 can be adjusted relative to the cutter 3 in conjunction with the chuck 8042, thereby changing the initial distance between the pressure roller 2 and the cutter 3, so that the cutter 3 can cut raw materials of different thicknesses.
[0040] In use, the slide block 403, sleeve 701, and partition 502 ensure that the adjustment of the partition 502 and the cutter 3 is synchronized, so that the top surface of the partition 502 is always lower than the cutter 3. The working process and effect of this part are the same as in Embodiment 1, and will not be repeated here. The difference is that when the motor 401 drives the first lead screw 402 to rotate, the first lead screw 402 can drive the slide block 403, cutter 3, block 804, support rod 801, and pressure roller 2 to descend one position synchronously. At this time, the support rod 801 descends relative to the second gear 803, but the transmission is still maintained through the key shaft assembly. The first lead screw 402 will also drive the support rod 801 to rotate in the opposite direction through the first gear 802 and the second gear 803, thereby driving the block 804 and pressure roller 2 to rise one position in the opposite direction, so that the pressure roller 2 returns to its original position.
[0041] As a further improvement to this embodiment: the number of openings 503 and partitions 502 can be two, and they are symmetrically positioned. In this case, the sponge is located between the two partitions 502, and both partitions 502 are connected to the horizontal axis 702 via connecting rods 703. Thus, both partitions 502 are synchronously adjusted with the cutter 3. Through the above design, when moving to the left, the sponge can abut against one partition 502 for cutting, and when moving to the right, the sponge can abut against the other partition 502 for cutting. Therefore, while ensuring stable material feeding, the left and right reciprocating stroke can be fully utilized, further improving work efficiency.
[0042] Compared to Embodiment 1, the coordinated structure of block 804, support rod 801, first gear 802, and second gear 803 ensures that the position of pressure roller 2 remains unchanged when the cutter 3 descends and adjusts its position. This allows pressure roller 2 to remain in its original position and maintain a limiting effect, eliminating the need to repeatedly move the already cut material. This effectively improves work efficiency and reduces workload. The overall design, combined with the placement of pressure roller 2, allows for multiple cuts to be completed simply by conveying the sponge back and forth. Furthermore, the cut material is stacked vertically, facilitating subsequent collection and transfer, thus enhancing its versatility. Example
[0043] Please see Figures 1 to 10 Based on Embodiment 2, considering that the up and down movement of the slide block 403 will drive the block 804 and the pressure roller 2 to move synchronously through the support rod 801, and the descent of the cutter 3 will keep the pressure roller 2 in its original position, the initial positioning of the pressure roller 2 is more troublesome. When the cutter 3 moves to the cutting height, the pressure roller 2 may not be corresponding to the top surface of the sponge. It is not convenient to quickly lower or raise the pressure roller 2 to correspond to the top surface of the sponge by only the second lead screw 8041 and the chuck 8042.
[0044] Therefore, the second gear 803 and the support rod 801 are improved: the support rod 801 now includes an upper rod 8011 fixedly connected to the second gear 803 and a lower rod 8012 threaded onto the outside of the block 804. The upper rod 8011 and the lower rod 8012 are connected by a locking assembly 9, and the lower rod 8012 is rotatably engaged with the slide 403. When the lower rod 8012 descends with the slide 403, the locking assembly 9 can maintain the transmission between the upper rod 8011 and the lower rod 8012, while the upper rod 8011 can remain in the same state as the frame 1.
[0045] Reference Figure 9 and Figure 10 In this embodiment, preferably, the engaging assembly 9 includes two overlapping, staggered engaging blocks 901, with a spring 902 fixedly mounted between the two engaging blocks 901. The spring 902 causes the two engaging blocks 901 to tend to move away from each other. Simultaneously, slots 8013 are provided between the opposing surfaces of the upper rod 8011 and the lower rod 8012 for the engaging blocks 901 to be placed. The spring 902 also causes the engaging blocks 901 to abut against the slots 8013.
[0046] In this embodiment, the locking block 901 has an L-shaped design and a vertical straight-line design. The spring 902 is located between the two locking blocks 901. As long as the two locking blocks 901 remain in an overlapping and fitted state, and the rotation of the locking blocks 901 can drive the upper rod 8011 / lower rod 8012 to rotate, the locking block 901 will function correctly. Simultaneously, the locking block 901 has a certain length in the front-to-back direction, facilitating its removal from the locking slot 8013.
[0047] In use, the slide block 403, sleeve 701, and partition 502 ensure that the adjustment of partition 502 and cutter 3 is synchronized, so that the top surface of partition 502 is always lower than cutter 3. The block 804, support rod 801, and second gear 803 ensure that the position of pressure roller 2 remains unchanged when cutter 3 is lowered for adjustment, maintaining the limiting effect. This part of the process and its effect are the same as in embodiment two and will not be repeated here. The difference is that when the distance between pressure roller 2 and cutter 3 is approximately appropriate, it can be adjusted solely by the second lead screw 8041 and chuck 8042.
[0048] When the gap is large, the two locking blocks 901 can be pulled out of the slots 8013 first. At this time, the upper rod 8011 and the lower rod 8012 are desynchronized from their synchronous rotation state, and the pressure roller 2 and the cutter 3 can maintain synchronous movement. The second lead screw 8041 or the lower rod 8012 can be adjusted to make the gap between the pressure roller 2 and the cutter 3 approximately appropriate. Then, the two locking blocks 901 are reinserted into the slots 8013. The spring 902 makes the two locking blocks 901 abut against the corresponding slots 8013 respectively. At this time, the rotation of the upper locking block 901 can drive the lower locking block 901 to rotate synchronously, thereby restoring the upper rod 8011 and the lower rod 8012 to their synchronous rotation state.
[0049] Compared to Embodiment 2, the coordinated structure of the upper rod 8011, lower rod 8012, spring 902, and locking block 901 facilitates rapid adjustment of the position of the pressure roller 2. This ensures that when the cutter 3 aligns with the cutting position, the pressure roller 2 also accurately aligns with the top surface of the sponge, thereby guaranteeing the limiting effect on the sponge during material feeding. The overall design, combined with the support rod 801, facilitates rapid initial positioning of the pressure roller 2, improving overall work efficiency and meeting more practical application requirements.
Claims
1. An automatic feeding device for flat cutting machine processing, comprising a frame, a cutter for cutting sponge, and a pressure roller for limiting the sponge, characterized in that, The frame is equipped with a support assembly for conveying sponge and an adjustment assembly for driving the pressure roller and cutter to move. The adjustment assembly is equipped with a synchronization assembly that is fixedly connected to the support assembly. The frame is equipped with a control module for driving the support assembly to move. When the adjustment assembly drives the cutter to rise and fall, the synchronization assembly can realize the automatic avoidance of the cutter by the support assembly. The support assembly includes a base plate driven by a control module, with an opening on the rear side of the base plate, and a partition plate that is fixedly connected to the synchronization assembly is slidably installed in the opening. The adjustment assembly includes a motor fixedly connected to the frame, a first lead screw that rotates with the frame is fixedly mounted on the output shaft of the motor, a slide block that slides with the frame and is fixedly connected to the sleeve is threaded on the outer surface of the first lead screw, and a cutter is fixedly mounted on the slide block. The synchronization component includes a sleeve fixedly connected to the slide block, a horizontal shaft slidingly mounted inside the sleeve, a connecting rod fixedly mounted on the surface of the horizontal shaft and fixedly connected to the partition plate, and a notch opened on the surface of the sleeve to allow the connecting rod to pass through.
2. The automatic feeding device for flat cutting machine processing according to claim 1, characterized in that, The height dimension of the partition based on the base plate is lower than the height dimension of the cutter based on the base plate.
3. The automatic feeding device for flat cutting machine processing according to claim 2, characterized in that, The distance between the bottom surface of the horizontal axis and the top surface of the partition is less than or equal to the depth of the opening based on the bottom plate.
4. The automatic feeding device for flat cutting machine processing according to claim 3, characterized in that, The adjustment assembly also includes a transmission assembly for mounting the pressure roller, which enables the pressure roller and the cutter to move in opposite directions, and the travel of the pressure roller is equal to the travel of the cutter.
5. The automatic feeding device for flat cutting machine processing according to claim 4, characterized in that, The transmission assembly includes a support rod that rotates with the slide, a first gear fixedly mounted on the outer surface of the first lead screw, and a second gear rotatably mounted on the frame. The second gear meshes with the first gear and is coaxial with the support rod. The outer surface of the support rod is threaded with a block that slides with the slide and is used to mount the pressure roller.
6. The automatic feeding device for flat cutting machine processing according to claim 5, characterized in that, The second gear and the support rod are keyed together, which allows the first gear, the second gear and the support rod to rotate synchronously, and the second gear and the support rod to slide up and down relative to each other.
7. The automatic feeding device for flat cutting machine processing according to claim 6, characterized in that, A second lead screw is rotatably mounted on the surface of the block. The outer surface of the second lead screw is threaded with a chuck for engaging with the pressure roller. The pressure roller can rotate based on the chuck, and the chuck can drive the pressure roller to move up and down.
Citation Information
Patent Citations
Industrial automatic rubber cutting device and method
CN114347174A
Sponge horizontal cutting machine
CN214446777U