Limiting device and reaming system

Abstract

The utility model provides a kind of limiting device and chambering system, it is related to casing hot expansion technical field, the limiting device provided by the utility model includes support, holding mechanism, first driver and pull structure, holding mechanism and first driver are connected with support, holding mechanism is configured as the end to be processed of fixed product, pull structure is connected with first driver, first driver is configured as to drive pull structure to move along vertical direction, pull structure is configured as the overhanging end of pulling product, the above-mentioned limiting device can guarantee chambering mechanism and the accurate centering of end to be processed, improve chambering quality and processing consistency.

Description

Technical Field

[0001] This utility model relates to the field of sleeve thermal expansion technology, and in particular to a limiting device and a hole expansion system. Background Technology

[0002] In the production process of urine collection bags, the shell is a key structural component. One end of the shell is equipped with a sleeve for connecting the catheter. The sleeve needs to be enlarged before assembly to ensure the sealing and reliability of subsequent pipeline connections.

[0003] Existing reaming processes for tubing are typically automated. The process involves a carrier using a lifting mechanism to transport the urine collection bag (with its casing attached) to the reaming station. The reaming mechanism then aligns the casing with the tubing and performs the reaming action. However, because the casing is only fixedly connected to the urine collection bag at one end with the tubing, while the other end is unsupported and suspended, the end of the casing furthest from the tubing will sink during processing due to its own weight. This causes the tubing axis to tilt, making it impossible to maintain horizontal alignment. Consequently, this affects the precise alignment of the reaming mechanism and the tubing, reducing reaming quality and processing consistency. Utility Model Content

[0004] The purpose of this invention is to provide a limiting device and a hole-reaming system that can ensure precise alignment between the hole-reaming mechanism and the end to be processed, thereby improving hole-reaming quality and processing consistency. Additionally, a hole-reaming system using the aforementioned limiting device is provided.

[0005] To achieve the above objectives, this utility model provides the following technical solution: In a first aspect, the present invention provides a limiting device, including a bracket, a material holding mechanism, a first driver, and a lifting structure. The material holding mechanism and the first driver are both connected to the bracket. The material holding mechanism is configured to fix the end of the product to be processed. The lifting structure is connected to the first driver. The first driver is configured to drive the lifting structure to move in a vertical direction. The lifting structure is configured to lift the suspended end of the product.

[0006] Compared with the prior art, the limiting device provided by this utility model, when in use, the first driver drives the lifting structure to move downward in the vertical direction, the lifting structure lifts the suspended end of the product and keeps the product horizontal, and the material holding mechanism fixes the end of the product to be processed. In this way, the stability of the product in the subsequent hole expansion process is guaranteed, the suspended end of the product is prevented from sinking due to gravity, the hole expansion mechanism and the end to be processed are accurately aligned, and the hole expansion quality and processing consistency are improved.

[0007] In an optional embodiment, the lifting structure includes a mounting base and an adsorption head, the mounting base being connected to the first driver, the adsorption head being connected to the mounting base, and the adsorption head being configured to adsorb the suspended end.

[0008] The above-described implementation method, by setting up a lifting structure consisting of a mounting base and an adsorption head, utilizes negative pressure adsorption to achieve low-damage lifting of the suspended end of the product. Combined with the lifting control of the first driver, it effectively solves the problem of product deformation caused by its own weight during processing, and improves the automation level and process stability of the equipment.

[0009] In an optional embodiment, the lifting structure further includes a limiting block connected to the mounting base, the limiting block being configured to limit the distance of the suspended end in the vertical direction.

[0010] The above-described implementation method, by setting a limiting block, can effectively prevent excessive lifting caused by changes in adsorption force due to air pressure fluctuations, avoid the problem of reverse warping of the product, and improve the consistency of product posture and repeatability of positioning accuracy during multiple batch processing.

[0011] In an optional embodiment, the adsorption head and the limiting block are configured as a plurality of corresponding entities; In each pair of adsorption heads and limiting blocks: the limiting block is located on the side of the adsorption head closer to the material holding mechanism or on the side farther away from the material holding mechanism.

[0012] The above implementation method can achieve multi-point coordinated lifting and position limitation of the suspended end.

[0013] In an optional embodiment, the material holding mechanism includes a second driver and a clamping assembly. The second driver is connected to the bracket, and the clamping assembly is connected to the second driver. The second driver is configured to drive the clamping assembly to move in a vertical direction, and the clamping assembly is configured to clamp the end to be processed.

[0014] The above-described implementation not only achieves precise positioning and stable clamping of the processing end, but also adapts to the needs of different product specifications or loading / unloading spaces through its liftable structure, thereby improving the equipment's compatibility and automation level.

[0015] In an optional embodiment, the limiting device further includes a blocking mechanism connected to the bracket, the blocking mechanism being configured to abut against the end of the product furthest from the end to be processed.

[0016] The above-described embodiments, by setting up a blocking mechanism, can accurately position the axial position of the product during the clamping process. Combined with the material holding mechanism, it can ensure that the product is always located at the predetermined reference position during the hole enlargement process, thus ensuring product processing consistency.

[0017] In an optional embodiment, the blocking mechanism includes a third driver and a baffle. The third driver is connected to the bracket, and the baffle is connected to the third driver. The third driver is configured to drive the baffle to move horizontally, and the baffle is configured to abut against the end of the product away from the end to be processed.

[0018] When the product is clamped in the holding mechanism and its suspended end is subjected to a vertical upward pulling force by the lifting structure, the third drive drives the baffle to move horizontally toward the product until the baffle contacts the end of the product and forms a stable contact. The product then waits for the hole-expanding mechanism to process it, which facilitates the loading of the product.

[0019] In an optional embodiment, the baffle is configured to be disposed opposite to the end to be processed along the extension direction of the end to be processed.

[0020] When enlarging the end to be processed, the baffle can effectively limit the product's movement along the axis of the end to be processed by applying a stable axial constraint to the far end of the product, preventing it from sliding back and forth or changing its posture during the enlarging process. At the same time, since the baffle and the end to be processed are relatively aligned in the extension direction, no lateral force or torsional torque is introduced, ensuring that the product is always in the ideal processing posture, further improving the positioning accuracy and processing consistency in the enlarging process.

[0021] Secondly, this utility model provides a hole-expanding system, including a hole-expanding mechanism and a limiting device as described in any of the foregoing embodiments, wherein the hole-expanding mechanism has an expanding end, and the expanding end is configured to enter and exit the end to be processed.

[0022] The hole-expanding system provided in the second aspect of this utility model has the limiting device provided in the first aspect of this utility model, and thus has all the beneficial effects of the limiting device provided in the first aspect of this utility model.

[0023] In an optional embodiment, the reaming system further includes a carrier and a fourth actuator connected to the carrier and configured to move the carrier in a vertical direction.

[0024] The above-described implementation method, by setting up a linkage structure between the fourth driver and the carrier, can realize automatic loading and unloading and precise positioning of products in the vertical direction, effectively improving the automation level and operating cycle of the entire hole expansion system. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A three-dimensional structural diagram of the hole-enlarging system provided in an embodiment of this utility model from a first-view perspective; Figure 2 A three-dimensional structural diagram of the hole-enlarging system provided in an embodiment of this utility model from a second perspective; Figure 3 A three-dimensional structural diagram of the hole-enlarging system provided in an embodiment of this utility model from a third-view perspective; Figure 4 This is a rear view of the hole-enlarging system provided in an embodiment of the present invention.

[0027] Icons: 1-Bracket; 2-Material holding mechanism; 21-Second driver; 22-Clamping assembly; 3-First driver; 4-Lifting structure; 41-Mounting base; 42-Adsorption head; 43-Limiting block; 5-Product; 51-End to be processed; 52-Suspended end; 6-Blocking mechanism; 61-Third driver; 62-Baffle; 7-Drilling mechanism; 71-Drilling end; 72-Fifth driver; 8-Carrier; 9-Fourth driver. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0032] The first aspect of this utility model provides a limiting device, such as... Figure 1 As shown, it includes a support 1, a material holding mechanism 2, a first driver 3, and a lifting structure 4. The material holding mechanism 2 and the first driver 3 are both connected to the support 1. The material holding mechanism 2 is configured to fix the processing end 51 of the product 5. The lifting structure 4 is connected to the first driver 3. The first driver 3 is configured to drive the lifting structure 4 to move in the vertical direction. The lifting structure 4 is configured to lift the suspended end 52 of the product 5.

[0033] When using, such as Figure 1 As shown, the first driver 3 drives the lifting structure 4 to move downward in the vertical direction. The lifting structure 4 lifts the suspended end 52 of the product 5. The material holding mechanism 2 fixes the end 51 of the product 5 to be processed, keeping the product 5 horizontal, ensuring the stability of the product 5 in the subsequent hole expansion process, preventing the suspended end 52 of the product 5 from sinking due to gravity, ensuring the accurate alignment of the hole expansion mechanism and the end 51 to be processed, and improving the hole expansion quality and processing consistency.

[0034] The lifting structure 4 can lift the suspended end 52 by applying force such as negative pressure suction, magnetic attraction or clamping force.

[0035] In an optional embodiment, the lifting structure 4 includes a mounting base 41 and an adsorption head 42; the mounting base 41 is fixedly connected to the output end of the first driver 3; the adsorption head 42 is disposed below the mounting base 41 and is detachably or fixedly connected to the mounting base 41 via a connector.

[0036] During operation, the first actuator 3 moves the mounting base 41 and its suction head 42 downwards, bringing the suction head 42 into contact with the suspended end 52 of the product 5. Then, the vacuum system is activated, and the suction head 42 adheres to the suspended end 52. Subsequently, the first actuator 3 retracts upwards, applying an upward pulling force through the suction head 42 to counteract the downward sag of the suspended end 52 due to its own weight. Simultaneously, the material holding mechanism 2 firmly clamps the end 51 of the product 5 to be processed, maintaining its fixed position. Thus, the entire product 5 is maintained in a horizontal position, ensuring that the reaming tool can accurately align with the processing position of the end 51 in the subsequent reaming process, significantly improving hole accuracy and processing consistency.

[0037] The above-described embodiment uses a lifting structure 4 consisting of a mounting base 41 and an adsorption head 42 to achieve low-damage lifting of the suspended end 52 of the product by using negative pressure adsorption. Combined with the lifting control of the first driver 3, it effectively solves the problem of product deformation caused by its own weight during processing, and improves the automation level and process stability of the equipment.

[0038] The mounting base 41 can be connected to the first driver 3 by means of threaded connection, snap-fit ​​or flange connection, so as to achieve synchronous movement with the driving action of the first driver 3; the adsorption head 42 is installed on the bottom surface of the mounting base 41 by screws or quick-change connectors, which facilitates maintenance and replacement.

[0039] Specifically, the adsorption head 42 has at least one vacuum suction cup or negative pressure adsorption surface on the side facing the suspended end 52 of the product 5. The vacuum suction cup is connected to an external vacuum pump or vacuum generator through a built-in channel. When the adsorption head 42 approaches and contacts the suspended end 52, the vacuum system is activated to form a negative pressure zone between the adsorption surface and the surface of the suspended end 52, thereby generating an adsorption force and stably adsorbing the suspended end 52 onto the adsorption head 42.

[0040] The number of adsorption heads 42 can be configured according to the size, weight, and structural characteristics of the product 5. For example, when processing longer or heavier products, multiple adsorption heads 42 can be arranged laterally at intervals to achieve multi-point synergistic adsorption, improving the uniformity and stability of force during the lifting process. Figure 2 As shown, two adsorption heads 42 are configured, and the two adsorption heads 42 are arranged in a direction perpendicular to the lifting structure facing the material holding mechanism 2. In addition, each adsorption head 42 can be connected to the vacuum system through an independent pipeline to monitor the working status of each adsorption point and prevent overall failure due to local air leakage.

[0041] In addition, the first driver 3 can be a pneumatic cylinder, hydraulic cylinder, or electric linear actuator (such as an electric push rod, servo cylinder, etc.), which can provide stable and controllable vertical lifting power.

[0042] In an optional embodiment, the lifting structure 4 further includes a limiting block 43, which is connected to the mounting base 41 and configured to physically limit the vertical displacement of the suspended end 52 of the product 5.

[0043] When the first driver 3 drives the lifting structure 4 to move downward in the vertical direction, the adsorption head 42 adsorbs the suspended end 52 of the product 5 under the action of negative pressure and applies an upward lifting force. In order to avoid the suspended end 52 being lifted too much due to excessive negative pressure, when it is lifted to a certain height, the upper surface of the suspended end 52 abuts against the lower surface of the limiting block 43, thereby limiting the suspended end 52 from moving further upward under the action of negative pressure and ensuring the positioning accuracy of the suspended end 52 in the vertical direction.

[0044] The above-described implementation method, by setting the limiting block 43, can effectively prevent excessive lifting caused by changes in adsorption force due to air pressure fluctuations, avoid the problem of reverse warping of product 5, and improve the consistency of product posture and repeatability of positioning accuracy during multiple batch processing.

[0045] Specifically, the limiting block 43 is disposed on the periphery of the adsorption head 42, and its position and height can be preset or adjusted according to the geometric dimensions and process requirements of the product 5 to be processed. The limiting block 43 can be connected to the mounting base 41 by bolts, pins or other connecting parts. A buffer pad is provided on the side of the limiting block 43 facing the product 5. The material of the buffer pad can be rubber, polyurethane or silicone, which is used to reduce the impact force at the moment of contact and protect the product surface from damage.

[0046] like Figure 2 and Figure 3 As shown, the adsorption head 42 and the limiting block 43 are configured in a one-to-one correspondence to form multiple lifting and limiting units, so as to realize multi-point coordinated lifting and position limiting of the suspended end 52.

[0047] Specifically, in each pair of adsorption heads 42 and limiting blocks 43: the limiting block 43 is located on the side of the adsorption head 42 closer to the material holding mechanism 2 or on the side away from the material holding mechanism 2.

[0048] Regardless of which side the limiting block 43 is located on, it can limit the suspended end 52 of product 5, ensuring the horizontal position accuracy of product 5.

[0049] Preferably, the limiting block 43 is located on the side of the adsorption head 42 away from the material holding mechanism 2. The above arrangement increases the distance between the limiting block 43 and the material holding mechanism 2. Under the limitation of the material holding mechanism 2 and the limiting block 43, the product 5 can have more precise positional accuracy.

[0050] It should be noted that any structure that can fix the processing end 51 of product 5 can be the material holding mechanism 2 mentioned in the above embodiments.

[0051] In some alternative embodiments, the material holding mechanism 2 may be in the form of a pneumatic clamp, a hydraulic clamp, or an electric clamp, for example, including two clamping arms arranged opposite each other. The two clamping arms are driven to close by a cylinder or a motor to clamp the outer peripheral surface or a specific positioning part of the end 51 of the product 5 to be processed, thereby achieving a stable fixation.

[0052] In other embodiments, the material holding mechanism 2 may include a combination structure of a support base and a pressure plate, wherein the support base is used to restrict the vertical positional freedom of the product 5, and the pressure plate is pressed down by bolts or pneumatic components to press the end 51 of the product 5 to be processed onto the support base.

[0053] Specifically, such as Figure 2 As shown, the material holding mechanism 2 includes a second driver 21 and a clamping assembly 22. The second driver 21 is connected to the bracket 1, and the clamping assembly 22 is connected to the second driver 21. The second driver 21 is configured to drive the clamping assembly 22 to move in the vertical direction, and the clamping assembly 22 is configured to clamp the end 51 to be processed.

[0054] During operation, when product 5 is fed into the processing station, the second driver 21 drives the clamping assembly 22 to descend to the preset clamping height, aligning it with the end to be processed 51; then the clamping assembly 22 closes, clamping the end to be processed 51, and firmly fixing the end to be processed 51 of product 5 in the predetermined position.

[0055] The above-described implementation not only achieves precise positioning and stable clamping of the processing end 51, but also adapts to the needs of different product specifications or loading / unloading spaces through its liftable structure, thereby improving the compatibility and automation of the equipment.

[0056] The second driver 21 can be a cylinder, an electric push rod or a servo motor in conjunction with a transmission mechanism, etc. It has good responsiveness and position control accuracy, and can automatically adjust the height position of the clamping assembly 22 according to the processing flow.

[0057] The clamping assembly 22 can be a two-jaw pneumatic finger, a symmetrical opening and closing clamp, or other clamping mechanisms suitable for the shape of the target product. For example, a V-groove chuck can be set for cylindrical workpieces, and a flat pressure block can be set for flat workpieces.

[0058] In alternative implementations, such as Figure 3 As shown, the limiting device also includes a blocking mechanism 6 connected to the bracket 1. The blocking mechanism 6 is configured to abut against the end of the product 5 away from the end 51 to be processed, so as to limit and position the product 5 in the horizontal direction.

[0059] When enlarging the end 51 to be processed, the enlarging mechanism 7 will apply a pushing force to the end 51 to be processed along the axial direction of the end 51 to be processed. The above embodiment can accurately position the axial position of the product during the product clamping process by setting the blocking mechanism 6. Together with the material holding mechanism 2, it can ensure that the product 5 is always in the predetermined reference position during the enlarging process, thus ensuring the consistency of the product 5 processing.

[0060] It should be noted that any structure that can abut against the end of the product 5 away from the end 51 to be processed can be the blocking mechanism 6 mentioned in the above embodiments. The blocking mechanism 6 can include a baffle fixed relative to the support 1, or a blocking structure that can move relative to the support 1 in the horizontal direction.

[0061] In alternative implementations, such as Figure 1 and Figure 3 As shown, the blocking mechanism 6 includes a third driver 61 and a baffle 62. The third driver 61 is connected to the bracket 1, and the baffle 62 is connected to the third driver 61. The third driver 61 is configured to drive the baffle 62 to move in the horizontal direction, and the baffle 62 is configured to abut against the end of the product 5 away from the end 51 to be processed.

[0062] When product 5 is clamped in the material holding mechanism 2 and its suspended end 52 is subjected to a vertical upward pulling force by the lifting structure 4, the third driver 61 drives the baffle 62 to move horizontally toward product 5 until the baffle 62 contacts the end of product 5 (i.e. the end away from the end to be processed 51) and forms a stable contact. Product 5 waits for the hole expansion mechanism 7 to process it, which facilitates the feeding of product 5.

[0063] The third drive 61 can be an actuator with precise stroke control capabilities, such as a cylinder, an electric push rod, or a servo linear module, to realize the controllable extension and retraction of the baffle 62.

[0064] Preferably, the side of the baffle 62 facing the product 5 is provided with a buffer pad to prevent rigid collision damage to the product surface.

[0065] In an optional embodiment, the baffle 62 is configured to be disposed opposite to the end 51 to be processed along the extension direction of the end 51 to be processed.

[0066] "The extension direction along the end to be processed 51" refers to the axial extension path of the end to be processed 51 along its own length. For example, when the end to be processed 51 is part of a rod-shaped or tubular structure, its extension direction is the axial direction of the rod-shaped structure.

[0067] When enlarging the end 51 to be processed, the baffle 62 can effectively limit the movement of the product 5 along the axis of the end 51 to be processed by applying a stable axial constraint to the far end of the product, preventing it from sliding back and forth or changing its posture during the enlarging process. At the same time, since the baffle 62 and the end 51 to be processed are relatively aligned in the extension direction, no lateral force or torsional torque will be introduced, ensuring that the product 5 is always in the ideal processing posture, further improving the positioning accuracy and processing consistency in the enlarging process.

[0068] The second aspect of this utility model provides a hole-expanding system. The hole-expanding system provided by the second aspect of this utility model includes a hole-expanding mechanism 7 and the aforementioned limiting device. The hole-expanding mechanism 7 has a hole-expanding end 71, which is configured to enter and exit the end to be processed 51.

[0069] During the operation, the product 5 is first fixed and leveled by the limiting device. Then, the reaming mechanism 7 is activated, and the reaming end 71 enters the end to be processed 51 axially to complete the reaming operation under the set parameters. Since the limiting device ensures the coaxiality and alignment between the end to be processed 51 and the reaming end 71, the stability, dimensional accuracy and batch consistency of the reaming process are significantly improved.

[0070] The hole-expanding mechanism 7 can be electrically connected to the control system to realize functions such as automatic start and stop, feed speed adjustment, and machining depth control; the first driver 3, the second driver 21, and the third driver 61 in the limit device can also be coordinated and linked by the same control system to form a complete automated hole-expanding process.

[0071] Specifically, such as Figure 4 As shown, the hole-reaming mechanism 7 includes a fifth driver 72 and a hole reamer. The hole reamer has a hole-to-ream end 71. The fifth driver 72 is connected to the hole reamer to drive the hole-ream end 71 in and out of the hole-to-process end 51.

[0072] The fifth actuator 72 can be mounted on the bracket 1 or an independent support structure. The fifth actuator 72 can be a conventional drive element such as a cylinder, an electric push rod, or a servo motor with a transmission mechanism.

[0073] Alternatively, an existing reamer can be used to apply stress to the end 51 to be processed, thereby achieving reaming.

[0074] In alternative implementations, such as Figure 4 As shown, the reaming system also includes a carrier 8 and a fourth actuator 9; the carrier 8 is used to carry and position the product 5, placing it in an initial position suitable for processing; the fourth actuator 9 is fixedly connected to the carrier 8, mounted on the bracket 1 or the frame structure of the system, and configured to drive the carrier 8 to perform precise vertical lifting and lowering movements.

[0075] The above-described implementation method, by setting up a linkage structure between the fourth driver 9 and the carrier 8, can realize the automatic loading and unloading and precise positioning of the product 5 in the vertical direction, effectively improving the automation level and operating cycle of the entire hole expansion system.

[0076] The fourth actuator 9 can be a power component that can achieve precise linear motion, such as a pneumatic cylinder, an electric push rod, a linear motor, or a servo motor in conjunction with a lead screw and nut mechanism.

[0077] In a preferred embodiment, the bearing surface of the carrier 8 is provided with a positioning groove to help fix the product 5 and prevent it from shifting during the lifting process.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A position limiting device, characterized by, The product includes a support (1), a material holding mechanism (2), a first driver (3), and a lifting structure (4). The material holding mechanism (2) and the first driver (3) are both connected to the support (1). The material holding mechanism (2) is configured to fix the processing end (51) of the product (5). The lifting structure (4) is connected to the first driver (3). The first driver (3) is configured to drive the lifting structure (4) to move in the vertical direction. The lifting structure (4) is configured to lift the suspended end (52) of the product (5).

2. The limiting device according to claim 1, characterized in that, The lifting structure (4) includes a mounting base (41) and an adsorption head (42). The mounting base (41) is connected to the first driver (3), and the adsorption head (42) is connected to the mounting base (41). The adsorption head (42) is configured to adsorb the suspended end (52).

3. The limiting device according to claim 2, characterized in that, The lifting structure (4) further includes a limiting block (43) connected to the mounting base (41), and the limiting block (43) is configured to limit the distance of the suspended end (52) in the vertical direction.

4. The limiting device according to claim 3, characterized in that, The adsorption head (42) and the limiting block (43) are configured in a one-to-one correspondence of multiple; In each pair of adsorption heads (42) and limiting blocks (43): the limiting block (43) is located on the side of the adsorption head (42) closer to the material holding mechanism (2) or away from the material holding mechanism (2).

5. The limiting device according to claim 1, characterized in that, The material holding mechanism (2) includes a second driver (21) and a clamping assembly (22). The second driver (21) is connected to the bracket (1), and the clamping assembly (22) is connected to the second driver (21). The second driver (21) is configured to drive the clamping assembly (22) to move in the vertical direction, and the clamping assembly (22) is configured to clamp the end to be processed (51).

6. The limiting device according to any one of claims 1-5, characterized in that, The limiting device also includes a blocking mechanism (6) connected to the bracket (1), the blocking mechanism (6) being configured to abut against the end of the product (5) away from the end to be processed (51).

7. The limiting device according to claim 6, characterized in that, The blocking mechanism (6) includes a third driver (61) and a baffle (62). The third driver (61) is connected to the bracket (1), and the baffle (62) is connected to the third driver (61). The third driver (61) is configured to drive the baffle (62) to move in the horizontal direction, and the baffle (62) is configured to abut against the end of the product (5) away from the end to be processed (51).

8. The limiting device according to claim 7, characterized in that, The baffle (62) is configured to be disposed opposite to the end to be processed (51) along the extension direction of the end to be processed (51).

9. A hole-reducing system, characterized in that, Includes a hole-expanding mechanism (7) and a limiting device as described in any one of claims 1-8, wherein the hole-expanding mechanism (7) has an expanding end (71) configured to enter and exit the end to be processed (51).

10. The hole-reaming system according to claim 9, characterized in that, The hole-enlarging system also includes a carrier (8) and a fourth driver (9), the fourth driver (9) being connected to the carrier (8) and configured to drive the carrier (8) to move in a vertical direction.

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