A slitting device for processing oil test paper

Abstract

This utility model discloses a slitting device for processing oil test strips, relating to the field of oil test strip processing technology. The slitting device includes a base and a fixing frame; the slitting assembly includes a first cutter shaft and a second cutter shaft. A third drive motor is fixedly connected to the rear side of the fixing frame. Multiple test strip cutters are slidably sleeved on the middle surface of the first cutter shaft. A first limiting frame is snapped onto the surface of the first cutter shaft. A cutter limiting cylinder is slidably sleeved on the surface of the second cutter shaft. Multiple cutter grooves are formed on the outer surface of the cutter limiting cylinder. In this device, the middle end of the first cutter shaft is a hexagonal prism segment, allowing the test strip cutters to slide and adjust their position directly along the hexagonal prism segment without disassembling the entire drive shaft. The first limiting frame is fixed to the first cutter shaft by a single set of bolts. Disassembly only requires unscrewing this set of bolts to remove the first limiting frame and slide to replace the test strip cutters. Replacing multiple sets of cutters saves downtime and significantly improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of oil test paper processing technology, and in particular to a slitting device for processing oil test paper. Background Technology

[0002] In industrial production, environmental monitoring, and food processing, oil content detection is a crucial step in ensuring production safety, environmental quality, and product quality. Oil test strips, as a convenient and rapid tool for oil content detection, are finding increasingly wider applications. As market demands for higher accuracy and ease of use, the structural design of oil test strips is also becoming more complex.

[0003] In the production process of oil test strips, the slitting process is the core step of dividing the continuously produced test strip rolls into individual finished products according to the preset size. The performance of the slitting device used for oil test strip processing directly determines the slitting accuracy, edge smoothness and production efficiency of the test strips.

[0004] However, in actual production, due to the diverse specifications of oil testing papers (such as differences in length, width, and cut shape), it is necessary to frequently change slitting blades of different sizes and types. Furthermore, after long-term use, the slitting blades experience blade wear and chipping, requiring periodic disassembly for grinding and repair or replacement. Existing slitting blades are mostly rigidly connected to the drive shaft via multiple bolts and nuts. Disassembly requires the use of wrenches, screwdrivers, and other tools to unscrew the fasteners one by one, resulting in numerous steps and time-consuming operations. This significantly impacts production efficiency, especially in scenarios requiring the replacement of multiple sets of slitting blades. Therefore, this utility model proposes a novel solution. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide a slitting device for processing oil test paper. This device can solve the problem that existing slitting blades are rigidly connected to the drive shaft by multiple bolts and nuts. When disassembling, it is necessary to use tools such as wrenches and screwdrivers to unscrew the fasteners one by one. This process involves many steps and is time-consuming. In particular, it affects production efficiency, especially in scenarios where multiple slitting blades need to be replaced.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a slitting device for processing oil test paper, comprising a base and a fixing frame;

[0007] The slitting assembly is mounted on a fixed frame and includes a first cutter shaft and a second cutter shaft, both of which are rotatably connected to the fixed frame.

[0008] A third drive motor is fixedly connected to the rear side of the fixed frame. The output end of the third drive motor is connected to the first blade holder shaft. Multiple test paper cutters are slidably sleeved on the middle surface of the first blade holder shaft. A first limit frame is snapped onto the surface of the first blade holder shaft. The first limit frame is fixed to the first blade holder shaft by bolts.

[0009] A cutter limiting sleeve is slidably sleeved on the surface of the second cutter shaft. Multiple cutter grooves are opened on the outer surface of the cutter limiting sleeve. Multiple test paper cutters are respectively adapted to the corresponding cutter grooves. A second limiting frame is snapped onto the surface of the second cutter shaft. The second limiting frame is fixed to the second cutter shaft by bolts.

[0010] Preferably, the rear section of the first tool post shaft is cylindrical, the middle section of the first tool post shaft is composed of two sets of hexagonal prisms, and the front end of the first tool post shaft is screw-shaped.

[0011] Preferably, the rear section of the second tool post shaft is cylindrical, the front section of the second tool post shaft is hexagonal prism, and the front end of the second tool post shaft is screw-shaped.

[0012] Preferably, a first drive motor is fixedly connected to the rear end of the base, and an unwinding shaft is fixedly connected to the output end of the first drive motor. The unwinding shaft is divided into two sections: a cylinder and a hexagonal prism. The front end of the hexagonal prism of the unwinding shaft is screw-shaped.

[0013] The surface of the unwinding shaft is slidably fitted with a first test paper roll, which is fixed to the unwinding shaft by bolts.

[0014] Preferably, a second drive motor is fixedly connected to the rear end of the base, and a take-up shaft is fixedly connected to the output end of the second drive motor. The take-up shaft is divided into two sections: a cylinder and a hexagonal prism. The front end of the hexagonal prism of the take-up shaft is screw-shaped.

[0015] A second test paper roll is slidably fitted onto the surface of the take-up shaft, and the second test paper roll is fixed to the take-up shaft by bolts.

[0016] Preferably, a connecting bracket is fixedly connected to the upper end of the base, and grooves are provided on the surfaces of both the base and the connecting bracket. A first test paper guide roller is slidably connected to the inner side of the two grooves of the base, and a guide roller frame is rotatably connected to the front and rear ends of the first test paper guide roller.

[0017] Two hydraulic rods are hinged to the upper end of the base, and the output ends of the two hydraulic rods are respectively hinged to the corresponding guide roller frame.

[0018] Preferably, a second test paper guide roller is rotatably connected inside the fixing frame.

[0019] Preferably, gears are fixedly connected to the surfaces of both the first tool post shaft and the second tool post shaft, and the two gears mesh.

[0020] Preferably, multiple limiting holes can be formed on the surfaces of the first blade holder shaft and the multiple test paper cutters, and multiple limiting shafts can be fixedly connected to the side of the first limiting frame near the test paper cutter;

[0021] Multiple limiting shafts are slidably connected to the limiting holes corresponding to the surface of the first tool holder shaft and the limiting holes corresponding to the surface of the first limiting frame.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. The oil test paper processing cutting device has a hexagonal prism section at the middle of the first blade holder shaft. The test paper cutter can be directly slid along the hexagonal prism section to adjust its position without disassembling the entire drive shaft. The first limit frame is fixed to the first blade holder shaft by a single set of bolts. During disassembly, only the bolts need to be unscrewed to remove the first limit frame and slide to replace the test paper cutter. When replacing multiple sets of cutters, downtime can be saved and production efficiency can be significantly improved. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 This is a schematic diagram of the slitting device for processing oil test paper according to the present invention;

[0026] Figure 2 This is a schematic diagram of the front side of the cutting device of this utility model;

[0027] Figure 3 This is a schematic diagram of the unwinding shaft of this utility model;

[0028] Figure 4 This is a schematic diagram of the winding shaft of this utility model;

[0029] Figure 5 This is a schematic diagram of the first test paper guide roller of this utility model;

[0030] Figure 6 This is a schematic diagram of the cutter limiting cylinder of this utility model;

[0031] Figure 7 This is a schematic diagram of the test paper cutter of this utility model;

[0032] Figure 8 This is a schematic diagram of the gear of this utility model;

[0033] Figure 9 This is a schematic diagram of the first limiting frame of this utility model;

[0034] Figure 10 This is a schematic diagram of the limiting shaft of this utility model.

[0035] Reference numerals in the attached drawings: 1. Base; 2. Fixing frame; 3. First drive motor; 4. Unwinding shaft; 5. Second drive motor; 6. Rewinding shaft; 7. Third drive motor; 8. First cutter holder shaft; 9. Second cutter holder shaft; 10. First test paper roll; 11. Second test paper roll; 12. Hydraulic rod; 13. Guide roller frame; 14. First test paper guide roller; 15. Connecting bracket; 16. Slide groove; 17. Test paper cutter; 18. First limiting frame; 19. Cutter limiting cylinder; 20. Cutter groove; 21. Second limiting frame; 22. Gear; 23. Limiting shaft; 24. Limiting hole; 25. Second test paper guide roller. Detailed Implementation

[0036] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] Please see Figure 1-10 This utility model provides a technical solution: a slitting device for processing oil test paper, wherein the upper end of the base 1 is fixedly connected to the fixed frame 2, providing stable support for the entire slitting device; the rear side of the fixed frame 2 is fixed to the third drive motor 7, and the output end of the third drive motor 7 is connected to the first blade holder shaft 8. After starting, it can drive the first blade holder shaft 8 to rotate stably, providing power for the slitting operation. Moreover, the motor is selected as an adjustable speed model, and the slitting speed can be adjusted according to the material of the test paper.

[0041] The rear section of the first blade holder shaft 8 is cylindrical, the middle section is a combination of two sets of hexagonal prisms, and the front end is screw-shaped. The hexagonal prism structure in the middle section can restrict the test paper cutter 17 from rotating around the shaft and prevent the cutter from deviating during cutting. Multiple test paper cutters 17 are slidably sleeved in the middle of the first blade holder shaft 8, and the spacing can be flexibly adjusted according to the cutting width. The first limit frame 18 is snapped onto the surface of the first blade holder shaft 8 and fixed by bolts. It can abut against the test paper cutter 17 from the side to prevent it from moving axially.

[0042] The rear section of the second blade holder shaft 9 is cylindrical, the front section is hexagonal prism, and the front end is screw-shaped. The hexagonal prism structure facilitates the sliding positioning of the cutter limiting cylinder 19. The cutter limiting cylinder 19 is slidably sleeved on the front section of the second blade holder shaft 9. The cutter groove 20 on the outer surface is adapted to the test paper cutter 17. When cutting, the test paper cutter 17 is embedded in the cutter groove 20 to avoid direct contact between the blade and the second blade holder shaft 9. The second limiting frame 21 is fixed to the surface of the second blade holder shaft 9 by bolts, which can fix the position of the cutter limiting cylinder 19.

[0043] The rear end of the base 1 is fixed to the first drive motor 3 and the second drive motor 5 respectively. The output end of the first drive motor 3 is connected to the unwinding shaft 4, and the output end of the second drive motor 5 is connected to the winding shaft 6. Both the unwinding shaft 4 and the winding shaft 6 have a "cylinder + hexagonal prism + screw" structure. The hexagonal prism section is used to fit the first test paper roll 10 and the second test paper roll 11 respectively to prevent the roll from slipping when rotating. The screw end can be further fixed with a nut to ensure stable unwinding and winding speed.

[0044] The upper end of the base 1 is fixed to the connecting bracket 15, and both surfaces are provided with grooves 16. The front and rear ends of the first test paper guide roller 14 are slidably connected to the grooves 16 through the guide roller frame 13. The output end of the hydraulic rod 12 hinged on the base 1 is connected to the guide roller frame 13. Activating the hydraulic rod 12 can push the guide roller frame 13 to move up and down along the grooves 16, thereby adjusting the height of the first test paper guide roller 14 to adapt to the conveying requirements of test papers of different thicknesses and avoid test paper wrinkles.

[0045] The fixed frame 2 is internally rotatably connected to the second test paper guide roller 25. After being cut, the strip test paper is guided by the second test paper guide roller 25 and can be smoothly conveyed to the take-up shaft 6, preventing the test paper from being scattered and causing conveying disorder. Gears 22 can be fixed on the surfaces of the first knife holder shaft 8 and the second knife holder shaft 9. The two gears 22 mesh to ensure that the two knife holder shafts rotate synchronously in opposite directions, improving the cutting accuracy. Limiting holes 24 can be opened on the surfaces of the first knife holder shaft 8 and the test paper cutter 17. The limiting shaft 23 on the first limiting frame 18 is slidably connected to the limiting hole 24, which can further enhance the positioning of the test paper cutter 17.

[0046] Working principle: Before starting the device, the cutting parameters need to be precisely adjusted to match the specifications of the oil test strips to be processed. According to the preset cutting width of the test strips, multiple test strip cutters 17 are slidably fitted onto the hexagonal prism section at the middle of the first cutter shaft 8, so that the spacing between each test strip cutter 17 is consistent with the target width. Since the middle of the first cutter shaft 8 is a hexagonal prism structure, it can effectively restrict the rotation of the test strip cutter 17 around the shaft, ensuring cutting stability. At the same time, the cutter limiting cylinder 19 on the hexagonal prism section at the front of the second cutter shaft 9 is slid, so that the cutter groove 20 opened on the outer surface of the cutter limiting cylinder 19 is precisely aligned with the corresponding test strip cutter 17, forming a "blade and groove" matching structure to avoid damage to the blades during cutting.

[0047] After adjustment, the first limiting frame 18 is snapped onto the surface of the first blade holder shaft 8 and fixed to the first blade holder shaft 8 with bolts. At this time, multiple limiting shafts 23 on the side of the first limiting frame 18 near the test paper cutter 17 will be inserted into the limiting holes 24 opened on the surface of the first blade holder shaft 8 and the test paper cutter 17, respectively, to further strengthen the positioning of the test paper cutter 17 and prevent the position from shifting due to vibration during the cutting process. Similarly, the cutter limiting cylinder 19 is fixed by the second limiting frame 21 in cooperation with bolts.

[0048] Start the hydraulic rod 12 on the base 1. The output end of the hydraulic rod 12 pushes the guide roller frame 13 to slide up and down along the slide groove 16 opened on the surface of the base 1 and the connecting bracket 15. This causes the first test paper guide roller 14 rotatably connected to the guide roller frame 13 to adjust its height so that the height of the first test paper guide roller 14 matches the height of the unwinding shaft 4 and the first knife holder shaft 8, ensuring a smooth test paper conveying path.

[0049] After commissioning, the device enters automated operation. The oil test paper roll passes through each core component from left to right, completing the slitting process.

[0050] The first drive motor 3, which is fixed at the rear end of the base 1, is started. The output end of the first drive motor 3 drives the unwinding shaft 4 to rotate. The first test paper roll 10, which is slidably sleeved on the surface of the unwinding shaft 4 and fixed by bolts, rotates synchronously with the unwinding shaft 4, releasing the oil test paper roll at a uniform speed. Since the unwinding shaft 4 is divided into a cylindrical section and a hexagonal prism section, the hexagonal prism section can prevent relative sliding between the first test paper roll 10 and the unwinding shaft 4, ensuring a stable unwinding speed.

[0051] The test paper roll released from the first test paper roll 10 first enters the surface of the first test paper guide roller 14. The first test paper guide roller 14 guides and tensions the test paper roll by rotating, preventing wrinkles and deviations in the test paper during the conveying process. After being guided by the first test paper guide roller 14, the test paper roll continues to be conveyed to the right to the slitting area between the first cutter shaft 8 and the second cutter shaft 9.

[0052] When the third drive motor 7 is started, the output end of the third drive motor 7 drives the first blade holder shaft 8 to rotate. At this time, the test paper cutter 17 on the first blade holder shaft 8 rotates at high speed with the shaft and cooperates with the cutter groove 20 of the cutter limiting cylinder 19 on the second blade holder shaft 9 to accurately cut the passing test paper roll, dividing the continuous test paper roll into multiple sets of strip test papers that meet the preset width. The cutter groove 20 not only provides cutting space for the test paper cutter 17, but also avoids direct contact between the blade and the second blade holder shaft 9, extending the blade's service life.

[0053] After being cut, the strip test paper continues to be conveyed to the right and enters the surface of the second test paper guide roller 25, which is rotatably connected inside the fixed frame 2. The second test paper guide roller 25 plays a transitional guiding role for the strip test paper by rotating, ensuring that the strip test paper enters the subsequent winding stage smoothly and avoiding conveying chaos caused by the test paper being scattered after cutting.

[0054] After being slit and guided, the strip-shaped test paper finally enters the winding stage to complete the collection of finished products. The second drive motor 5 at the rear end of the base 1 is started. The output end of the second drive motor 5 drives the winding shaft 6 to rotate. The second test paper roll 11, which is slidably sleeved on the surface of the winding shaft 6 and fixed by bolts, rotates synchronously with the winding shaft 6, and the strip-shaped test paper conveyed from the second test paper guide roller 25 is wound into a roll at a uniform speed. The winding shaft 6 also adopts a structure combining cylindrical and hexagonal prism sections, which can prevent relative sliding between the second test paper roll 11 and the winding shaft 6, and ensure that the winding speed matches the previous unwinding and slitting speed, finally forming a neat strip-shaped test paper finished roll, completing the entire oil test paper slitting and processing process.

[0055] Furthermore, in this device, the middle end of the first blade holder shaft 8 is set as a hexagonal prism section, and the test paper cutter 17 can be directly slid along the hexagonal prism section to adjust its position without disassembling the entire drive shaft; it is fixed to the first blade holder shaft 8 by a single set of bolts in conjunction with the first limiting frame 18. When disassembling, only this set of bolts needs to be unscrewed to remove the first limiting frame 18 and slide to replace the test paper cutter 17. When replacing multiple sets of cutters, downtime can be saved and production efficiency can be significantly improved.

[0056] Example 1: Mass production of standard-specification oil test strips (dual-gear meshing)

[0057] At the ends of the first tool post shaft 8 and the second tool post shaft 9 near the fixed frame 2, a spur gear 22 of type M2.2 is fixed by a flat key to ensure that when the first tool post shaft 8 rotates, the second tool post shaft 9 is driven to rotate synchronously in the opposite direction through the meshing of the gear 22.

[0058] The meshing of the double gears 22 ensures that the two blade holder shafts rotate at the same speed, avoiding fuzzing of the test paper edges due to speed difference; the hexagonal prism section is fixed with bolts and limited by the first limit frame 18, so that the test paper cutter 17 has no positional displacement during long-term continuous operation, reducing the cutting size error; when replacing the test paper cutter 17, only a single fixing bolt needs to be removed, without having to unscrew multiple sets of fasteners one by one, solving the problems of cumbersome disassembly of the cutting blade and low positioning accuracy, and meeting the needs of large-scale continuous production.

[0059] Example 2: Small-batch, multi-specification oil test paper cutting scenario (flexible positioning with shaft hole limiting)

[0060] A set of limiting holes 24 are opened along the axial direction in the hexagonal prism section at the middle end of the first blade holder shaft 8; two limiting holes 24 of the same diameter are opened on the inner end face of each test paper cutter 17; two sets of limiting shafts 23 are welded to the side of the first limiting frame 18 near the test paper cutter 17. The limiting shafts 23 slide with the limiting holes 24 of the first blade holder shaft 8 and the test paper cutter 17 respectively. After insertion, the first limiting frame 18 is fixed to the first blade holder shaft 8 by hand-tightening bolts.

[0061] The combination of the limiting shaft 23 and the limiting hole 24, and the cooperation between the test paper cutter 17 and the corresponding cutter groove 20, allows for quick adjustment of the position of the test paper cutter 17 without modifying the fixing components. The bolt tightening and sliding fit prevent damage to the components during disassembly. This solves the problems of poor adaptability of the slitting knife and easy damage to the components, and meets the needs of small-batch multi-specification production.

[0062] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A slitting device for processing oil test paper, characterized in that: Includes a base (1) and a mounting bracket (2); The slitting assembly is mounted on the fixed frame (2). The slitting assembly includes a first blade holder shaft (8) and a second blade holder shaft (9). Both the first blade holder shaft (8) and the second blade holder shaft (9) are rotatably connected to the fixed frame (2). A third drive motor (7) is fixedly connected to the rear side of the fixed frame (2). The output end of the third drive motor (7) is connected to the first knife holder shaft (8). Multiple test paper cutters (17) are slidably sleeved on the middle surface of the first knife holder shaft (8). A first limit frame (18) is snapped onto the surface of the first knife holder shaft (8). The first limit frame (18) is fixed to the first knife holder shaft (8) by bolts. The surface of the second blade holder shaft (9) is slidably fitted with a cutter limiting sleeve (19). The outer surface of the cutter limiting sleeve (19) is provided with multiple cutter grooves (20). Multiple test paper cutters (17) are respectively adapted to the corresponding cutter grooves (20). The surface of the second blade holder shaft (9) is clamped with a second limiting frame (21). The second limiting frame (21) is fixed to the second blade holder shaft (9) by bolts.

2. The slitting apparatus for processing oil test paper according to claim 1, characterized in that: The rear section of the first tool holder shaft (8) is cylindrical, the middle end of the first tool holder shaft (8) is composed of two sets of hexagonal prisms, and the front end of the first tool holder shaft (8) is screw-shaped.

3. The slitting device for processing oil test paper according to claim 1, characterized in that: The rear section of the second tool holder shaft (9) is cylindrical, the front section of the second tool holder shaft (9) is hexagonal prism, and the front end of the second tool holder shaft (9) is screw-shaped.

4. The slitting device for processing oil test paper according to claim 1, characterized in that: The base (1) is fixedly connected to the rear end of a first drive motor (3), and the output end of the first drive motor (3) is fixedly connected to a unwinding shaft (4). The unwinding shaft (4) is divided into two sections: a cylinder and a hexagonal prism. The front end of the hexagonal prism of the unwinding shaft (4) is screw-shaped. The surface of the unwinding shaft (4) is slidably fitted with a first test paper roll (10), and the first test paper roll (10) is fixed to the unwinding shaft (4) by bolts.

5. The slitting device for processing oil test paper according to claim 1, characterized in that: The base (1) is fixedly connected to a second drive motor (5) at its rear end. The output end of the second drive motor (5) is fixedly connected to a take-up shaft (6). The take-up shaft (6) is divided into two sections: a cylinder and a hexagonal prism. The front end of the hexagonal prism of the take-up shaft (6) is screw-shaped. A second test paper roll (11) is slidably sleeved on the surface of the take-up shaft (6), and the second test paper roll (11) is fixed to the take-up shaft (6) by bolts.

6. The slitting apparatus for processing oil test paper according to claim 1, wherein: The upper end of the base (1) is fixedly connected to a connecting bracket (15). The surfaces of the base (1) and the connecting bracket (15) are provided with sliding grooves (16). The inner sides of the two sliding grooves (16) of the base (1) are slidably connected to the first test paper guide roller (14). The front and rear ends of the first test paper guide roller (14) are respectively rotatably connected to the guide roller frame (13). Two hydraulic rods (12) are hinged to the upper end of the base (1), and the output ends of the two hydraulic rods (12) are respectively hinged to the corresponding guide roller frame (13).

7. The slitting device for processing oil test paper according to claim 1, characterized in that: The second test paper guide roller (25) is rotatably connected inside the fixed frame (2).

8. The slitting device for processing oil test paper according to claim 1, characterized in that: Gears (22) can be fixedly connected to the surfaces of the first tool holder shaft (8) and the second tool holder shaft (9), and the two gears (22) mesh.

9. The slitting apparatus for processing oil test paper according to claim 1, wherein: Multiple limiting holes (24) can be opened on the surface of the first blade holder shaft (8) and multiple test paper cutters (17), and multiple limiting shafts (23) can be fixedly connected to the side of the first limiting frame (18) near the test paper cutter (17); Multiple limiting shafts (23) are slidably connected to the limiting holes (24) corresponding to the surface of the first tool holder shaft (8) and the limiting holes (24) corresponding to the surface of the first limiting frame (18).

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